171 results about "4d printing" patented technology

The invention provides a laser cladding 3D / 4D printing system and method, and the method comprises the following steps: S1, constructing a three-dimensional model of a to-be-printed piece, slicing the three-dimensional model, and generating a two-dimensional interface diagram of each layer of printing; s2, the additive manufacturing material of the current layer is melted through first laser to form a cladding layer; s3, carrying out micro-shaping on the surface of the cladding layer by using second laser, firstly carrying out micro-shaping on rough and hole defect areas on the surface of the cladding layer, and then carrying out point heat source irradiation on the surface of the cladding layer to eliminate residual stress of the cladding layer; and S4, the steps S2-S3 are repeated, the additive manufacturing process of each layer is completed, and a printed piece is obtained. According to the method, ultrafast laser shaping is carried out on the cladding layer in the laser 3D / 4D printing process, so that the problems of residual stress, interface-surface holes, uneven roughness and powder agglomeration and accumulation of the cladding layer of a laser 3D / 4D printing workpiece are solved, and the quality of the laser 3D / 4D printing workpiece is improved.

A three-dimensional transformable structure containing a set of individual elementary components, so-called IECs, forming a single-piece assembly. An IEC includes an active or inert material and at least one portion of the set of IECs includes at least three connecting means. Each connecting means of a considered IEC is arranged to cooperate with at least one connecting means of an IEC adjacent to the considered IEC to connect the considered IEC to the adjacent IEC. For the at least one portion of the set of IECs, at least one of the connecting means of a given IEC is located on a side opposite to at least another one of the connecting means of the considered IEC. At least one portion of the set of IECs includes so-called “active” IECs spatially arranged in the transformable structure so that at least one property of the transformable structure is modified in response to the application of at least one stimulus.

The invention relates to a 4D printing hydrogel material and a preparation method and application thereof, and belongs to the technical field of hydrogel materials.The preparation method of the 4D printing hydrogel material comprises the steps that S1, N-isopropylacrylamide is subjected to a prepolymerization reaction under the action of a photoinitiator, and a prepolymer is obtained; s2, the prepolymer, [2-(methylacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide and a cross-linking agent are mixed, and printing slurry is obtained; s3, carrying out 3D photocuring printing by adopting the printing slurry to obtain a hydrogel matrix with a porous structure; and S4, soaking the hydrogel matrix in a lithium salt solution to obtain the 4D printing hydrogel material. The 4D printing hydrogel material provided by the invention can generate a volume swelling phenomenon in a moisture absorption process, has rapid moisture absorption dynamics and ultrahigh moisture absorption capacity, and has excellent moisture storage and water collection capacities.

The invention discloses a reversible metal 4D printing method based on hydrogel reversible deformation and a metal part, and belongs to the field of metal additive manufacturing. The method comprises the following steps: firstly, constructing a three-dimensional model comprising a hydrogel driving layer and a metal blank layer; respectively preparing hydrogel light-cured ink and metal or precursor slurry thereof; printing the two layers of materials sequentially or alternately by adopting a photocuring printer to obtain a composite green body; the hydrogel layer is dehydrated and shrunk through drying, the component is driven to generate preset shape deformation, the hydrogel layer absorbs water and expands through soaking, and reversible recovery of the shape of the component is achieved; and degreasing, selective reduction and sintering heat treatment are conducted on the component, and the compact final metal component is obtained. According to the invention, the independent hydrogel layer is used as a deformation driver, the dependence on the intrinsic phase change characteristic of a metal material is avoided, the material universality is extremely high, the method can be widely applied to 4D printing of various materials including refractory metal and high-reflection metal, and reversible control of shape change is realized.

The invention provides a 4D printing esophageal stent and a preparation method thereof. The esophageal stent comprises a stent main body and a drug-loaded fiber membrane with a core-shell structure, the stent main body is a tubular stent composed of a bionic water lily hollow structure; the diameters of the head end and the tail end of the support body are larger than the diameter of the middle section, and barb structures are arranged on the outer surfaces of the head end and the tail end. The stent main body is a biodegradable shape memory polymer; the drug-loaded fibrous membrane is positioned on the outer surface of the middle section of the stent main body, and the drug-loaded fibrous membrane contains drugs. The 4D printing esophageal stent provided by the invention has excellent compressive bearing capacity and anti-slip capacity, and the drug-loaded fibrous membrane can avoid esophageal restenosis through long-term uniform slow release of drugs, so that the life safety of a patient can be further guaranteed.

The present invention discloses a 4D printing method, apparatus, and application thereof, including processes such as proportioning of multi-viscosity liquid components, flow mixing, degassing, temperature-controlled curing, filling, and final curing. Based on an integrated molding design concept, the method enables the preparation of pneumatically driven, self-propelled, deformable bionic structures (referred to as "bionic deformable actuators"). The apparatus and method of the present invention can produce functional components made of elastic, flexible materials with a viscosity range of 2,000 to 38,000 cps. This greatly simplifies the preparation process of bionic deformable actuators, enabling direct printing and single-stage molding without the need for secondary processing.

The present application relates to the field of intelligent protection, and particularly relates to a 4D printing system and method of a bionic energy-absorbing honeycomb structure with adjustable configuration, which can consider deformation and efficient energy absorption when facing different collision conditions, fully protect the integrity of the passenger cabin or cargo cabin, and effectively reduce the injury of passengers or goods. The printing device contains a double-material extrusion system, a control system and a dynamic forming platform. The double-material extrusion system integrates a digital magnetic control system with an auxiliary magnetic field material extrusion system. In the printing process, by planning the printing path and applying a magnetic field, a patterned ferromagnetic domain pattern can be obtained while forming a complex honeycomb structure. Under the coupling effect of a high-frequency induction heater and a driving magnetic field, combined with the dynamic chemical properties of the base material, the obtained honeycomb structure can adjust the cell structure and material stiffness of the honeycomb material to cope with different collision conditions, realize active intelligent protection, and has great application potential in the field of transportation.

The invention relates to the technical field of medical implants, in particular to a 4D printing-based porous Niti alloy bionic bone gradient structure construction method, which comprises the steps of patient bone data acquisition, bionic gradient model design, NiTi powder preparation, 4D printing, thermal treatment activation of memory effect, surface functionalization treatment and mechanical / biological performance test. The method is characterized by comprising the following preparation steps: accurately acquiring bone structure data through CT / MRI, combining Mimics pretreatment and UG / NX modeling, designing aperture and porosity for differentiation of cortical bone (low porosity of 30%-40%) and cancellous bone (high porosity of 50%-70%), simulating typical load working conditions through ANSYS, enabling the elastic modulus (3-15 GPa) and compressive strength (80-200 MPa) to be close to natural bone, and finally obtaining the bone structure data through the CT / MRI, the pore diameter and porosity of the cortical bone (low porosity of 30%-40%) and the porosity of the cancellous bone (high porosity of 50%-70%). According to the design, the elastic modulus difference between the implant and the host bone is remarkably reduced, the bone resorption problem caused by stress shielding is avoided, meanwhile, continuous porosity transition is achieved through the power gradual change technology, and the structural stability under the complex load is improved.

The invention discloses 3D printing direct writing ink capable of intelligently responding to hydrogel, which comprises the following components in parts by weight: 100 parts of water; 0.5 to 2.8 parts of carbomer; 6.8 to 18 parts of a hydrogel monomer N-isopropylacrylamide; 0.001 to 0.006 part of sodium hydroxide serving as a pH regulator; 0.005 to 0.02 part of a cross-linking agent, namely methylene bisacrylamide; 0.00625 to 0.0125 part of ammonium persulfate serving as an initiator; 0.00125 to 0.00375 parts of pyrrole; carbomer serves as a dispersing agent to inhibit pyrrole molecule agglomeration, pyrrole and an initiator ammonium persulfate have a synergistic effect in a polymerization reaction, a polypyrrole photo-thermal phase is generated in situ, thermal polymerization and crosslinking of a hydrogel monomer N-isopropylacrylamide are initiated, and a uniformly dispersed double-gel network is formed; through optimization of synergistic polymerization of pyrrole and ammonium persulfate and design of a carbomer dispersant, in-situ uniform dispersion of a photo-thermal phase and synchronous crosslinking of a gel network are realized, the photo-thermal conversion efficiency and material uniformity are improved, use of a toxic coagulant is avoided, the window period of 3D printing is prolonged, swelling deformation is inhibited, and the material is suitable for the fields of intelligent 4D printing, drug loading and bionic robots.

The invention provides a 4D printing path planning method based on fiber orientation and layering sequence, and relates to the technical field of intelligent additive manufacturing, and the method comprises the following steps: designing a two-dimensional plane precursor model according to a target three-dimensional structure, and dividing a deformation area and a non-deformation area; differentiated printing paths and material layouts are planned for different areas, material anisotropy is programmed by setting the movement angle of a printing spray head, and the stacking sequence and the thickness proportion of material layers are controlled; a multi-material composite printing process is adopted, PLA is deposited in the deformation area, and PETG is deposited in the non-deformation area; and finally, applying thermal stimulation at 70-75 DEG C to the component, so that the component is autonomously deformed into a three-dimensional functional component from a two-dimensional plane. Structural integrated manufacturing is achieved, deformation is accurate and controllable, interface combination is reliable, and the light weight and assembly efficiency is remarkably improved.

The invention discloses high-thermal-conductivity fiber toughened fluorescent ceramic as well as a preparation method and application thereof, and aims to solve the problems of brittle fracture and thermal quenching of traditional fluorescent ceramic. According to the method, a pre-strain programmable 4D printing technology is adopted, and aluminum nitride (AlN) short fibers and carboxymethyl cellulose are self-assembled to form a natural concentric cylinder microstructure, so that the toughness and the mechanical property of the ceramic are enhanced. The strain distribution of the rubber film in a tensile state is simulated through finite element analysis, and the stress direction and the deformation control of a key area are optimized. Pre-strain is applied to the rubber film, and a fluorescent ceramic biscuit is printed on the surface of the rubber film; after the stress is released, the ceramic body spontaneously deforms into a hollow hemispherical structure. A rubber substrate is removed through high-temperature sintering, and the fluorescent ceramic with high mechanical strength and high thermal conductivity is obtained. The bending strength of the fiber-toughened fluorescent ceramic reaches 500-600 MPa, and the fracture toughness is improved to 9-11 MPa.m / , so that the fiber-toughened fluorescent ceramic is obviously superior to the traditional fluorescent ceramic.

The invention relates to a 4D printing bionic artificial limb and a preparation method and application thereof, and relates to the technical field of medical rehabilitation instruments, the bionic artificial limb comprises a bionic skeleton and a flexible driving unit; the flexible driving unit is located at a joint moving part of the bionic skeleton and is used for driving the bionic skeleton to move; the bionic artificial limb is integrally formed through 4D printing, the bionic skeleton is made of a shape memory composite material, and the flexible driving unit is made of a hydrogel driving material; the shape memory composite material comprises a shape memory polymer and a reinforcing material in a mass ratio of (80-95%): (5-20%); the hydrogel driving material comprises a thermo-sensitive polymer matrix, a stabilizer and a functional filler in a mass ratio of (50%-80%): (20%-40%): (3%-15%). The 4D printing bionic artificial limb has the dynamic adjusting capacity, and the change requirements of the residual limb under different conditions can be met.

The invention belongs to the field of bionic soft robots, and particularly relates to a near-infrared light driven 4D printing bionic soft robot for underwater operation, and a preparation method of the near-infrared light driven 4D printing bionic soft robot comprises the following steps: adding graphene oxide into water, and carrying out ultrasonic treatment; adding an N-isopropylacrylamide monomer, N, N '-methylene bisacrylamide and phenyl (2, 4, 6-trimethylbenzoyl) lithium phosphate, and carrying out ultrasonic treatment; adding lithium bentonite to obtain ink; quickly stirring until the ink is inverted and does not flow to obtain the GO-NIPAM ink capable of being used for 3D printing; the GO-NIPAM ink is loaded into a charging barrel for 3D printing, a 3D printing model is of a starfish-imitating structure, and the GO-NIPAM ink of the starfish-imitating structure is obtained; ultraviolet light is used for curing, and GO-PNH hydrogel is obtained; and soaking in a 0.1-0.3 M hydrazine hydrate aqueous solution, and then soaking in deionized water to obtain the 4D printing bionic soft robot based on rGO-PNH. The 4D printing bionic soft-bodied robot has quick, stable and repeatable near-infrared light response, can execute grabbing and releasing actions, and can adapt to an underwater working environment.

The present invention relates to a highly conjugated photocurable discotic liquid crystal monomer based on benzotrithiophene-bridged carbazole and its application in 4D printing intelligent manufacturing, belonging to the technical field of liquid crystal materials. The structural general formula is as shown in Formula (I). In the present invention, carbazole and thiophene groups with good optoelectronic response are introduced into the photocurable liquid crystal molecular system to replace the low-conjugated phenyl structure bridged by traditional ester bonds, which not only realizes a lower driving voltage for 4D printing structures, but also the position of carbazole-NH is convenient for introducing flexible side chains, further realizing the regulation of the phase transition temperature of liquid crystal materials.

The invention provides a manufacturing process of a micro supercapacitor based on femtosecond laser 4D printing, which relates to the technical field of energy storage device manufacturing, and comprises the following steps: providing a substrate which is glass, a silicon wafer, a polymer film or a metal foil, and pre-treating the surface of the substrate to obtain a pre-treated substrate; and the pretreated substrate is coated with carbon quantum dots and shape memory epoxy resin to form a composite material layer. According to the manufacturing process of the micro supercapacitor based on femtosecond laser 4D printing, a femtosecond laser technology is combined with optical flow control printing and infrared laser irradiation, a porous structure can be accurately constructed in a composite material layer, a deformation state is solidified and fixed through infrared laser, and a novel manufacturing method of the micro supercapacitor is provided; a high-precision miniature capacitor structure is realized, and the energy storage capability and the cycling stability of the capacitor are effectively improved.

The utility model discloses an in-situ preheating device for a 4D printing composite material, and relates to the technical field of 4D printing. The wire cutting device comprises a mounting seat, a laser head is fixedly mounted on the outer surface of the mounting seat, a support is fixedly mounted at the top of the mounting seat, an adjusting assembly and a wire feeding assembly are arranged on the outer surface of the support, a wire cutting assembly is arranged at the bottom of the mounting seat, and a clamping assembly is arranged on the outer surface of the wire cutting assembly. The adjusting assembly is used for adjusting the size of the wire feeding assembly, and the wire feeding assembly is used for driving the prepreg wires to conduct movable wire feeding. Through connection of the adjusting assembly and the wire feeding assembly, when the adjusting assembly is rotated, the adjusting assembly converts rotary motion into linear motion and pushes the wire feeding assembly to do linear motion at the same time, so that the wire feeding assembly can be folded or separated, and gaps in the wire feeding assembly are changed; therefore, the wire feeding assembly can be in close contact with different prepreg wires to ensure the accuracy of a wire feeding path.

The present application relates to the technical field of materials, in particular to a multi-stage solidification shape memory polymer for 4D printing and a preparation method thereof. In view of the problem that it is difficult to build gradient mechanical functions by precisely regulating the structure modulus in a single structure of 4D printing, the present application obtains a single-component multi-stage solidification shape memory polymer by regulating the ratio of toluene-2, 4-diisocyanate-hydroxypropyl acrylate, shape memory polymer, polyethylene glycol 400 and 1, 3, 5-tris (6-isocyanate hexyl) -1, 3, 5-triazine-2, 4, 6-trione under the test feedback of the printing structure modulus, and solves the problem that it is difficult to build gradient mechanical properties in a single structure of 4D printing.

This invention relates to the field of printer nozzle technology, and more particularly to a high-precision FDM 4D printing nozzle for metal-plastic functional graded structures. The nozzle includes a first feeding device, two second feeding devices, a feeding connector, a water cooling device, a melting and stirring device, a feeding conduit shell, and multiple filament guides. This invention solves the problems of poor material mixing uniformity in existing technologies. In the design and fabrication of plastic functional graded structures, the composite precision and segregation of the plastic directly affect the performance and interface quality of the functional graded structure. Current plastic functional graded structure designs mainly focus on different material content ratios, requiring material design to be completed before molding. This results in a small range of material variability and poor flexibility. Furthermore, uneven plastic mixing directly causes inconsistencies between the functional graded structure performance and the design, severely leading to interface cracking and molding failure.

The invention provides a preparation method of a PLA / TPU based 4D printing composite material. The method comprises the following steps: weighing PLA, TPU, dicumyl peroxide (DCP) and maleic anhydride grafted polyethylene (MAH-g-PE) according to a specific ratio; drying the raw materials; carrying out melt blending and granulation in a specific temperature interval through a double-screw extruder; and finally, extruding the composite granules to prepare the printing wire material with the standard diameter. According to the method, through optimized process steps and parameters, the synergistic effect of the DCP cross-linking agent and the MAH-g-PE compatibilizer in the processing process is effectively promoted, and cross-linked network construction and interface compatibility are synchronously completed through a one-step method. The prepared composite wire is stable in specification and good in printing adaptability, the finally obtained 4D printing product has the advantages of being compact in interface bonding, excellent in shape memory performance and balanced in mechanical property, and the method is good in repeatability and suitable for industrial application.

A 4D printing intelligent structure design method based on a convolutional neural network comprises the following steps: parametric modeling and data generation: controlling finite element software through a script to construct a'material parameter field-target deformation field 'sample data set in batches; data preprocessing and geometric standardization: uniformly converting a complex design domain into a standard rectangular domain by adopting a conformal mapping technology, and realizing high-fidelity standardization of physical field data; constructing a U-Net + ResNet hybrid convolutional neural network, and combining with composite loss function training to synchronously optimize global and key region deformation prediction precision; performing standardization processing on the new design after model deployment to realize second-level high-precision deformation prediction; the physical space design is restored through inverse mapping, multi-material 4D printing manufacturing is driven, and a deformation verification closed loop is completed. According to the method, the limitation of complex geometric boundaries is broken through, the nonlinear and multi-physics field coupling characteristics of the intelligent material can be accurately represented, and the practicability of the scheme is ensured by the constructed'design-prediction-manufacturing 'integrated process.

The application discloses a kind of soft material 4D printing method and device with regionalized magnetic domain direction.The method comprises the following steps: establishing partition three-dimensional model and planning printing path to generate original G code;Based on the preset magnetic domain direction requirement, obtain the driving parameters of multiple magnetic poles by magnetic field model reverse decoupling, and re-edit G code to integrate magnetic field control and UV light control instruction;Prepare UV-curable soft material containing magnetic particles;After setting printing parameters, execute printing, synthesize three-dimensional magnetic field of preset direction at extrusion point when material extrusion makes magnetic particles directional, and delay to open UV light curing to lock magnetic domain direction.The application realizes three-dimensional space regionalization editing of magnetic domain direction inside soft material, significantly improves the deformation design freedom and motion control accuracy of 4D printing product, and provides reliable technical support for integrated manufacturing of complex driven soft robot.

The application provides a training mold and a design method for 4D printing of a shape memory alloy wing, and belongs to the technical field of aerospace vehicles. The purpose is to solve the problems of insufficient deformation precision, easy damage to the structure caused by stress concentration, long design trial and error period, high cost, and poor consistency of the training effect of components in the prior art. A driving mechanism and an upper mold are installed on a lower mold; the upper mold is provided with a first assigned camber line and a slider track at the top; a driving sleeve is installed in the upper part of a driving rod, and the bottom of the driving sleeve is provided with a slider; a placing platform is arranged on the lower mold, a supporting protrusion is arranged in the middle, a lower base platform is arranged between the placing platform and the supporting protrusion, and the supporting protrusion is provided with a second assigned camber line; and a curved wing is arranged on the base platform. The application solves the problems of insufficient deformation precision, easy damage to the structure caused by stress concentration, long design trial and error period, high cost, and poor consistency of the training effect of components in the prior art.

The invention relates to the field of food processing, in particular to tussah pupa protein-based 3D / 4D printing slurry as well as a preparation method and application thereof, and the tussah pupa protein-based 3D / 4D printing slurry comprises the following components in percentage by mass: 5-20% of tussah pupa protein, 5-10% of link / arthropod protein, 0.1-10% of fungal polysaccharide, 0.1-10% of globular protein, 0-5% of nutritional natural colorant and the balance of water. The tussah pupa protein-based food produced by the 3D / 4D printer has the characteristics of individuation, functionalization, nutrition, innovation and the like, and can achieve special complexity and curved surface degree, so that the product is more attractive to consumers; in the transportation process, the unique shape can be effectively kept so as to reduce the risk of being damaged on a logistics chain line, and the application range is wide.

The invention provides a micro interdigital supercapacitor manufacturing process based on optical flow control femtosecond laser 4D printing, and relates to the technical field of micro energy storage and advanced manufacturing, comprising: processing a micro-channel network on a silicon-based substrate, the micro-channel network comprising a sheath flow channel and a core flow channel, and constructing hydrophobic layers on the surfaces of the sheath flow channel and the core flow channel to form a micro-channel structure. According to the manufacturing process of the miniature interdigital supercapacitor based on optical flow control femtosecond laser 4D printing, the manufacturing of the miniature interdigital supercapacitor is successfully realized by processing a micro-channel network on a silicon-based substrate and combining a femtosecond laser 4D printing technology and a shape memory effect. Quantum dots and shape memory epoxy resin are mixed to form a composite filler, and two-photon polymerization curing induced by femtosecond laser is carried out to accurately construct an interdigital electrode framework, so that high performance and reversible deformation characteristics of the capacitor are ensured.

The application provides a 4D printing method for complex branched blood vessel structure based on illumination. The printing method is to obtain a precursor solution by dissolving and mixing a compound having a ortho-nitrobenzyl four-arm polyethylene glycol and a methacrylated hyaluronic acid with PBS; a modeling software is used to create a tube model of the complex branched blood vessel, wherein the tube model comprises a Y-shaped tube model, a T-shaped tube model, a first-stage branched tube model and a second-stage branched tube model; the prepared precursor solution is put into a DLP printer tank, material printing is performed according to a design scheme based on the tube model to be printed to form a tube piece structure, the tube piece structure is completely soaked in a PBS solution to self-curl to form a complex branched blood vessel structure, and the complex branched blood vessel structure is subjected to secondary crosslinking under ultraviolet light to form a closed complex branched blood vessel structure. The printing model of the complex pipeline is designed, integrated printing is performed, the model design of the connection is decoupled by changing the radial expansion characteristics of the 4D material to realize the self-curling curvature of the complex closed pipeline, and the 4D printing of the complex closed pipeline is realized.

The invention provides a pH response type MOF (Metal Organic Framework) material, a composite photosensitive resin system containing the pH response type MOF material and application of the pH response type MOF material in a dental appliance. The pH response type MOF material is a multifunctional metal organic framework material (Guardian-MOF) with a'core-shell-satellite 'structure, the MOF is chemically bonded into a light-cured resin matrix to form intelligent composite resin capable of 3D / 4D printing, and a prepared orthodontic appliance has required mechanical properties macroscopically so as to complete an orthodontic function, and has the advantages of being simple in preparation process, low in cost and the like. The oral cavity antibacterial and targeted remineralization treatment system is a distributed and intelligent'micro clinic 'microcosmically, can accurately respond to an oral cavity pathogenic microenvironment (low pH) and cooperatively execute multiple antibacterial and targeted remineralization treatment, and has a remarkable application prospect.

The application discloses an intelligent response type alkali-activated concrete and a digital twin design and 4D printing method, and belongs to the technical field of building materials and intelligent construction. The concrete has three-dimensional non-uniformly distributed functional materials inside, and the functional materials include intelligent response microcapsules with a four-layer structure of "core-shell-membrane-lubricating layer" and a hydrophobic agent. The application builds a new technology paradigm of "digital twin driven design, intelligent material creation, 4D printing precise construction, and whole-cycle intelligent management", realizes the precise distribution and dynamic regulation of the performance of the concrete material in the component according to needs, time and place, and synchronously solves key problems such as printing rheological regulation, microcapsule protection, interlayer penetration and sensor longevity, so that the durability, safety and service life of the concrete structure in a complex environment are greatly improved, and the application is suitable for long-life infrastructure engineering in extreme and harsh corrosive environments such as cross-sea bridges, undersea tunnels and saline-alkali land buildings.

The present invention discloses a PRP combined with carboxymethyl chitosan scaffold and its preparation method and application, which belongs to the field of biomaterial technology. The preparation method comprises the following steps: mixing carboxymethyl chitosan powder with hydroxyapatite powder, and then adding genipin powder to mix evenly to obtain a mixture; thawing frozen PRP and mixing it with ddH2O to obtain a mixed solution; adding the mixture to the mixed solution and stirring evenly, and eliminating bubbles to obtain ink; printing the ink using a 3D printer, and then placing it in a CaCl2 solution for deformation treatment to obtain a PRP combined with carboxymethyl chitosan scaffold. The present invention uses 4D printing technology to turn PPR into part of the printing ink by stirring, and utilizes the microporous structure of the scaffold and the slow degradation of the scaffold to achieve the slow release of growth factors in the PRP.

The application provides a combustion chamber and method for suppressing oscillating combustion based on 4D printing technology, the combustion chamber comprises a flame tube casing and a flame tube head, a flame tube is coaxially arranged in the flame tube casing, an air passage is formed between the outer wall of the flame tube and the flame tube casing, during the combustion process, the intelligent corrugated unit arranged on the inner wall of the flame tube improves the speed of sound wave attenuation and dissipation at the boundary, restrains the coupling of pulsating sound wave and pressure fluctuation, and then suppresses the oscillating combustion in the initial stage, and the intelligent corrugated unit made by the 4D printing technology can produce surface deformation under the excitation of the predetermined excitation temperature, and reduces the interference of the intelligent corrugated unit on normal combustion in the stable combustion process.