86 results about "Dynamic mechanical analysis" patented technology

In a dynamic mechanical analysis, a test specimen (2) is coupled to an excitation device (4) by means of a holder device (3). The excitation device (4) applies an excitation force comprised of a static pre-tensioning force component and a time-variable force component to the test specimen, and a deformation of the test specimen (2) is measured by means of one or more displacement sensors (5). The method includes a test phase with the steps: applying the excitation force to the test specimen; while said excitation force is in effect, determining at least one decision parameter, said decision parameter being indicative of a degree of slack in said coupling of the test specimen; comparing said decision parameter to at least one reference value; based on said comparison, determining whether or not the test specimen is coupled to the excitation device in a completely slack-free state, so that physical values derived from said measurements of the deformation will not be subject to errors caused by an insufficient amount of said pre-tensioning force component.

A geocell is disclosed that has high strength and stiffness, such that the geocell has a storage modulus of 500 MPa or greater at 23° C.; a storage modulus of 150 MPa or greater at 63° C. when measured in the machine direction using Dynamic Mechanical Analysis (DMA) at a frequency of 1 Hz; a tensile stress at 12% strain of 14.5 MPa or greater at 23° C.; a coefficient of thermal expansion of 120×10⁻⁶/° C. or less at 25° C.; and/or a long term design stress of 2.6 MPa or greater. The geocell is suitable for load support applications, especially for reinforcing base courses and/or subbases of roads, pavement, storage areas, and railways.

A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0° C. or lower in the temperature-loss tangent (tanδ) curve obtained by dynamic mechanical analysis (DMA).

An elastomeric composition is provided comprising at least one primary elastomer, one or more fillers, and at least one non-fibril cellulose ester, wherein the elastomeric composition exhibits a dynamic mechanical analysis (DMA) strain sweep modulus as measured at 5% strain and 30° C. of at least 1,450,000 Pa and a molded groove tear as measured according to ASTM D624 of at least 125 lbf/in.

The invention discloses a thermotropic crosslinking type shape memory polyurethane material obtained by thermal crosslinking of thermoplastic polyurethane with a side-chain double bond, a bifunctional crosslinking agent and an initiator; in a bending mode, the shape fixed rate is more than or equal to 95%, and the shape recovery rate is more than or equal to 90%; in a dynamic mechanical analysis tensile mode, the shape fixed rate is more than or equal to 95%, and the shape recovery rate is more than or equal to 90%. A preparation method disclosed by the invention is a second-step method and comprises the steps: firstly preparing the thermoplastic polyurethane with the side-chain double bond, then carrying out melting mixing or solution mixing with the bifunctional crosslinking agent under a condition with addition of the initiator, and carrying out thermal crosslinking to prepare the product. The polyurethane material disclosed by the invention has excellent shape memory properties and mechanical properties, the transition temperature is close to a body temperature, and the raw materials have good biological compatibility and no toxicity and can be degraded; the polyurethane material can be used as in-vivo implant materials and clinical surgical materials, also can be used for wire and cable casings and building pipe connecting sleeves, moreover, can be used for buffer sole protection devices, deformation toys and the like, and is suitable for large-scale industrialized production.

The invention relates to a carboxylated nitrile rubber-based high-performance damping material and a preparation method thereof. The material uses carboxylated nitrile rubber (XNBR) as a matrix and a hindered phenolic antioxidant 2,2'-methylene bis( 4-methyl-6-tert-butylphenol) is a damping additive obtained by blending and tableting; preparation: (1) Blending a certain proportion of carboxylated nitrile rubber and damping additives on a double-roller mixer Making a mixed film; (2) hot pressing the mixed film on a flat vulcanizing machine to obtain a thin sheet sample; (3) using a dynamic mechanical analyzer to perform a dynamic mechanical test on the sample to characterize its damping performance. The damping material of the present invention is characterized by a large loss factor, a wide effective damping temperature range, and the position of the damping peak can be regulated by adjusting the content of the damping additive, thereby obtaining a high-performance damping material suitable for use at different temperatures.

A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0 DEG C. or lower in the temperature-loss tangent (tandelta) curve obtained by dynamic mechanical analysis (DMA).

A tire component is provided comprising an elastomeric composition containing at least one non-fibril cellulose ester, at least one primary elastomer, and one or more fillers, wherein said composition exhibits a dynamic mechanical analysis (DMA) strain sweep modulus as measured at 5% strain and 30° C. of at least 1,450,000 Pa and a molded groove tear as measured according to ASTM D624 of at least 120 lbf/in.

The invention discloses an epoxide resin based piezoelectricity damping composite material and a preparation method thereof. The composite material consists of piezoelectric ceramics, graphitized carbon black and epoxide resins, wherein the components are integrated into one whole body by the secondary casting; the introduced piezoelectric ceramics is centralized on the upper part and the lower part of the composite material respectively, naturally settled in the process of forming and finally forms a sandwich structure with graded distribution. The invention utilizes the secondary casting forming process to prepare the epoxide resin based piezoelectricity damping composite material with the gradient sandwich structure, on the basis of realizing the piezoelectricity damping by the three-phase cooperation effect, the composite material also has the advantages of the sandwich structure, thereby greatly improving the damping performance of the composite material; through the dynamic mechanical analysis of a sample, the max. damping factor (tan delta max) is increased by more than 20 percent, the damping temperature zone delta T (the temperature zone where tan delta is more than 0.3)) is increased by more than 33 percent, and the area TA included under the tan delta-T curve is increased by more than 19 percent.

A geocell is disclosed that has high strength and stiffness, such that the geocell has a storage modulus of 500 MPa or greater at 23 DEG C; a storage modulus of 150 MPa or greater at 630C when measured in the machine direction using Dynamic Mechanical Analysis (DMA) at a frequency of 1 Hz; a tensile stress at 12% strain of 14.5 MPa or greater at 230C; a coefficient of thermal expansion of 120 x 10'6 /0C or less at 250C, and/or a long term design stress of 2.6 MPa or greater. The geocell is suitable for load support applications, especially for reinforcing base courses and/or subbases of roads, pavement, storage areas, and railways.

Thermoset compositions useful for dampening vibrations at elevated temperatures are disclosed. The thermoset compositions may have a glass transition temperature of 150 DEG C or greater, a tan d peak of 0.2 or greater, and a tan delta peak width measured at half-height larger than about 40 DEG C, each as measured by dynamic mechanical thermal analysis (DMTA) at a frequency of 1 Hz. The thermoset compositions may be used to dampen vibrations at temperatures in excess of 100 DEG C.

The invention discloses a prediction method for temperature distribution and warping deformation in a selective laser melting process. The method is mainly composed of thermal analysis and mechanicalanalysis. Thermal analysis comprises the steps that Step1, processing parameters are determined, and technological planning is performed; Step2, metal material heat relevant properties are acquired, and a model is established according to the dimensions of an SLM component; Step3, temperature boundary conditions are loaded; and Step4, transient analysis is performed to obtain a temperature field of the SLM component. Mechanical analysis comprises the steps that Step5, the model is modified according to material mechanical properties; and Step6, the boundary conditions are added, and the temperature field obtained through analysis in Step4 is used as a load to obtain a stress field and deformation of the component through analysis. According to the method, through thermoset coupling, thermal analysis and mechanical analysis are combined to establish a temperature and deformation prediction system, and technical support is provided for optimizing technological parameters and reducing warping deformation of the SLM component.

A method of treating at least part of a surface (110) of an article (100) in which an article (100) is treated, at least part of a surface (110, 111) of the article having been produced by an additive manufacturing method from a construction material, and the construction material provides a temperature T_G′ at which the storage modulus G′ of the construction material (determined by dynamic-mechanical analysis according to ISO 6721 at a shear rate of 1/s) is 10 MPa. The article is preferably placed into an evacuable volume and the volume is evacuated. By heating and exerting pressure, the surface is plastically deformed and can be smoothed thereby.

The present disclosure provides a polyimide resin having at least two glass transition temperatures measured by dynamic mechanical analysis (DMA). Also, a metal-clad laminate including the polyimide resin.

Novel segmented polyurethaneurea copolymers were synthesized using a poly(ethylene-butylene)glycol based soft segment. Dynamic mechanical analysis (DMA), small angle X-ray scattering (SAXS) and atomic force microscopy (AFM) established the presence of a microphase-separated structure in which hard microdomains are dispersed throughout a soft segment matrix. Wide angle X-ray scattering (WAXS) and differential scanning calorimetry (DSC) results suggest the materials are amorphous. Samples that are made with HMDI/DY and have hard segment contents in the range of 16-23 wt % surprisingly exhibit near-linear mechanical deformation behavior in excess of 600% elongation. They also show very high levels of recoverability even though their hysteresis is also considerable. The materials are both melt processable and solution processable.

A radiation curable inkjet printing method for producing printed flexible foils and plastic bags includes the steps of a) providing a web-like polymeric substrate having a maximum value for Tan δ between 40° C. and 110° C.; b) providing a single pass inkjet printer having at least one page-wide printhead or at least one set of staggered printheads, a transporting device arranged to transport the web-like recording medium, and a curing device; c) jetting onto the web-like polymeric substrate having a surface energy Ssub, a non-aqueous radiation curable inkjet liquid having a surface tension SLiq, wherein SLiq is smaller than SSub by at least 4 mN/m; and d) curing the radiation curable liquid on the substrate at a surface temperature equal or higher than the temperature of the maximum value for Tan δ and smaller than the melting point of the polymeric recording medium. The maximum value for Tan δ is determined by dynamic mechanical analysis at a temperature ramp of 3° C./min using forced oscillation with a cycle of 1 second and an amplitude of 100 μm. Also, a single pass inkjet printer for performing the method.

Disclosed is a method for improving vibration damping of a substrate, such as the underbody of an automobile. The method comprises applying a plastisol which comprises a polymeric component and a plasticizer. The fused plastisol has improved damping behavior as determined using Dynamic Mechanical Thermal Analysis. Novel plastisols and novel plasticizers are also disclosed.

Disclosed herein is a transparent electrode, including: a polyimide film having an average linear thermal expansion coefficient of 50.0 ppm/° C. or less, which is measured by thermo-mechanical analysis based on a film thickness of 50˜100 μm at a temperature of 50˜250° C., and a yellowness of 15 or less; and an electrode layer including a conductive material and a polyimide resin having an average linear thermal expansion coefficient of 50.0 ppm/° C. or less, which is measured by thermo-mechanical analysis based on a film thickness of 50˜100 μm at a temperature of 50˜250° C., and a yellowness of 15 or less. The transparent electrode is advantageous in that a problem of a short circuit does not occur even when apparatuses including this transparent electrode are over-heated because it has excellent heat resistance, and in that it is transparent and has high electroconductivity.

A side amino polysiloxane-modified polyurethane coating agent is disclosed. Side aminopolysiloxane (SAPDMS), polytetrahydrofuran glycol and polyethylene glycol as mixed soft segments, dimethylol propionic acid as a hydrophilic chain extender, and 1,4-butanediol as a hard segment regulator are reacted with isophorone diisocyanate to synthesize a waterborne silicone modified polyurethane (WSSPU), and the waterproof and moisture-permeable fabric coating agent is prepared based on the WSSPU. The composition and microstructure of a WSSPU film can be characterized by an infrared spectroscopy, a differential scanning calorimeter, a dynamic mechanical analyzer, a positron annihilation lifetime spectroscopy, and the like. The mechanical properties of the WSSPU film and the waterproof and moisture-permeable properties of a coated fabric are investigated. Results show that a stable emulsion can be obtained when the dosage of the side aminopolysiloxane (mass ratio) is less than 15%. After polysiloxane modification, the internal micro-phase separation structure of the film is more obvious, the free volume cavity becomes larger, and the moisture-permeable properties are improved.