7 results about "Phase morphology" patented technology

The invention provides a modified polypropylene material with a low linear expansion coefficient for an automobile and a preparation method of the modified polypropylene material, and belongs to the technical field of high polymer materials. The material is prepared from the following components in parts by weight: 60 to 80 parts of polypropylene resin, 5 to 20 parts of short glass fiber, 5 to 30 parts of flaky inorganic filler, 5 to 10 parts of elastomer flexibilizer, 2 to 5 parts of compatilizer, 1 to 2 parts of interfacial compatilizer and 0.2 to 0.5 part of antioxidant. On the basis of a flaky filler, short glass fiber and elastomer ternary synergistic system, a micro-nano lamination technology is introduced, and the micro-phase form of the material is reconstructed through an integrated process of pretreatment, premixing, layered melting, micro-nano lamination and cooling granulation, so that the flaky filler forms a two-dimensional barrier, the short glass fiber constructs a three-dimensional skeleton, and the three-dimensional structure is formed. The micro-nano layered structure reinforces the molecular chain constraint, and the three cooperate to further reduce the linear expansion coefficient; meanwhile, through the synergistic effect of the compatilizer and the interface compatilizer, the excellent rigid-tough balance of the material is ensured.

The invention relates to a thermoplastic composition comprising A) a non-crosslinked polymer and B) a covalent adaptable network, wherein the covalent adaptable network is the reaction product of B1) a component comprising at least two acid anhydride groups or comprising at least two pairs of carboxyl groups or comprising at least two pairs of derivatives of carboxyl groups and B2) a component with at least two functional groups independently from each other selected from -OH, -NHR and -SH, wherein R stands for an optionally substituted alkyl, aryl or arylalkyl residue, and wherein at least one of the components B1 and B2 has a functionality of >2, a process for preparing a thermoplastic molding compound from these thermoplastic compositions and molded articles comprising the thermoplastic compositions or thermoplastic molding compounds. The invention also relates to a thermoplastic molding compound comprising A) an amorphous non-crosslinked polymer as matrix phase B') a polymer different from polymer A which is characterized by a two phase morphology with a matrix phase i) containing component A, a phase ii) dispersed therein containing component B' and an interphase layer iii) of a defined thickness. In a particular embodiment of the invention the gradient of the ratio of components A and B' in the interphase layer iii) is in a certain range.

This invention relates to the field of flame-retardant polymer materials technology, specifically a process for preparing high-temperature flame-retardant PC / ABS alloy resin modified with maleic anhydride-grafted POE. The modification of PC / ABS alloys to achieve high heat resistance and halogen-free flame retardancy often presents the technical challenge of synergistically improving heat resistance, toughness, and flame retardancy. This invention employs a synergistically optimized preparation process. A specific step-feeding melt-blending extrusion strategy is used, where PC and heat-resistant ABS, with maleic anhydride-grafted POE as the core compatibilizer, are melt-blended. After sufficient plasticization and the initial formation of a stable phase structure, a heat-sensitive halogen-free phosphorus-based flame retardant and an anti-dripping agent are injected. This avoids premature decomposition and failure of the flame retardant at high temperatures, ensures sufficient reaction of POE-g-MAH at the PC / ABS phase interface, optimizes the dispersed phase morphology, enhances the low-temperature impact toughness and stress cracking resistance of the PC / ABS alloy resin, and solves the material brittleness problem caused by the introduction of flame retardants.

The invention discloses a method and a device for detecting the phase morphology of resin in filled vulcanized rubber. The method comprises the following steps: carrying out first pretreatment operation on a vulcanized rubber filling object to obtain a plurality of target vulcanized rubber filling object sections, and the first pretreatment operation sequentially comprises slicing treatment, etching treatment and drying treatment; for each target vulcanized rubber filling object section, obtaining a section microscopic image of the target vulcanized rubber filling object section; second preprocessing operation is carried out on the section microscopic image to obtain a corresponding target gray level image, and the second preprocessing operation sequentially comprises image type conversion and image enhancement; and detecting the resin phase in the target gray level image according to a threshold value method to obtain the form data of each resin phase in the tangent plane of the object filled with vulcanized rubber. The technical problem that the phase form of the filled vulcanized rubber resin cannot be effectively represented in the prior art is solved.

This invention relates to the field of ABS resin and discloses a method for evaluating the stress cracking resistance of ABS resin. The method includes: melting ABS resin to obtain a melt, followed by ultrasonic irradiation and granulation; obtaining the tensile properties, melt flow index, and viscosity-to-shear rate parameters of the ABS resin before and after treatment; and obtaining an evaluation value for the stress cracking resistance of the ABS resin based on these parameters. This evaluation method is time-saving and labor-saving. Furthermore, by utilizing external stimuli to "stimulate" and "intervene" the molecular chain structure and microstructure of the ABS resin, the obtained test data more accurately reflect the molecular chain structure and microstructure information of the ABS resin, thus leading to a more accurate evaluation result for the stress cracking resistance of the ABS resin.

The invention relates to the technical field of flame-retardant high-molecular polymer materials, in particular to a preparation process of maleic anhydride grafted POE (Polyolefin Elastomer) compatible modified high-temperature-resistant flame-retardant PC / ABS (Polycarbonate / Acrylonitrile In the modification process of high heat resistance and halogen-free flame retardancy of PC / ABS alloy, the technical problem that the heat resistance, toughness and flame retardancy are difficult to synergistically improve is often caused. The invention adopts a collaborative optimization preparation process. A specific step-by-step charging melt blending extrusion strategy is adopted, PC and heat-resistant ABS are used as maleic anhydride grafted POE of a core compatilizer for melt mixing, after the PC and the heat-resistant ABS are fully plasticized and a stable phase structure is preliminarily formed, a heat-sensitive halogen-free phosphorus flame retardant and an anti-dripping agent are injected, premature decomposition and failure of the flame retardant at a high temperature are avoided, and the flame-retardant and anti-dripping composite material is prepared. The POE-g-MAH is introduced into the PC / ABS alloy resin, so that full reaction of the POE-g-MAH at the PC / ABS phase interface is ensured, the dispersed phase form is optimized, the low-temperature impact toughness and stress cracking resistance of the PC / ABS alloy resin are enhanced, and the problem of material brittleness caused by introduction of a flame retardant is solved.

The invention relates to a graphene oxide-reinforced polyamide 6 / high-density polyethylene blend (PA6 / HDPE) nanocomposite and a preparation method thereof. With the invention, a graphene oxide-reinforced polyamide 6 / high-density polyethylene blend nanocomposite with maximized levels of homogeneity level is introduced. In the invention, the problem of agglomeration, which cannot be prevented in direct melt mixing used in the production of graphene oxide-reinforced polyamide 6 / high-density polyethylene blend (PA6 / HDPE) nanocomposite, was prevented by adding an additional solvent mixing step, thus eliminating the agglomeration problem and increasing the rate of graphene oxide in the nanocomposite material. In the invention, all the problems encountered in incorporating GO (graphene oxide) content into polymer nanocomposites containing polyamide 6 (PA6) and high-density polyethylene (HOPE) are eliminated and a nanocomposite is introduced in which the enhancing properties of GO are effectively transferred to the nanocomposite structure. In addition, the invention eliminates the limitations of the polyamide 6 / high-density polyethylene (PA6 / HDPE) blend nanocomposite, such as unstable phase morphologies and low interface strength.