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2251results about "Monocomponent synthetic polymer artificial filament" patented technology

Inorganic/organic composite polyimide-based nanofiber membrane and its preparation method and application

The invention relates to an inorganic/organic composite polyimide nanometer fibrous film. The inorganic/organic composite polyimide nanometer fibrous film is formed by an inorganic nanoparticle-doped polyimide nanometer fiber, wherein the mass of the inorganic nanoparticles accounts for 0.1-30% of the mass of polyamide acids; the diameter of the polyimide nanometer fiber is 20-500nm, the thickness of the film is 15-100mum, and the air permeability of the film is 10-500s, apertures on the upper surface; and apertures on the upper surface and the lower surface and in the film symmetrically and uniformly distribute, diameters of the apertures are less than 300nm, and the tensile strength of the film is 100-250MPa. According to the invention, a mixed solution of the inorganic nanoparticles and the polyamide acids is subjected to static spinning, machinery rolling, and high temperature imidization to prepare the film, so a preparation method of the film is suitable for large scale preparation. The inorganic/organic composite polyimide nanometer fibrous film can be applied to high capacity energy storage batteries and high power density power lithium ion batteries.

Method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods

The invention discloses a method for preparing polyacrylonitrile carbon fiber protofilament by dry and wet methods. The method comprises the steps of polymerization, demonomerization and defoaming, filtration, coagulation, washing and drafting, oiling densification, steam drafting, heat setting and drying. Three-level coagulating baths at the temperature of between 10 DEG C below zero and 70 DEG C and with dimethyl sulfoxide with concentration of 10 to 60 mass percent are adopted in the coagulation step, and the first coagulating bath contains aqueous ammonia accounting for 0.05 to 1 percent of the mass of the first coagulating bath; and a spinning head is subjected to 1.5 to 5 times positive drafting in the first coagulating bath, and the drafting is 0 in the second and third coagulatingbathes. According to the method for preparing the polyacrylonitrile carbon fiber protofilament, the spinning process is stable, the broken filament is little, the spinning speed is high, the spinningis stable, the prepared protofilament has few defects, the density is not less than 1.180g/cm<3>, and the tensile strength is not less than 7cN/dtex. The protofilament can be prepared into a high-performance carbon fiber with tensile strength of more than 4.9GPa and elastic modulus of between 260 and 280GPa by high-temperature carbonization.

Rapid prototyping shape memory high polymer material and preparation method and application thereof

The invention discloses a rapid prototyping shape memory high polymer material and a preparation method and application thereof. The high polymer material comprises a physical cross-linking hard-segment structure which can be rapidly cooled and formed and a high polymer soft-segment structure which can be fixed and temporarily deformed, wherein the hard-segment structure is formed by combining diisocyanate and a crystallization type chain extender; the soft-segment structure is formed by combining polyester type or polyether type polyhydric alcohol with the crystallization type chain extender; and the molar ratio of hydroxyl in the polyhydric alcohol to diisocyanate group in the diisocyanate is 1:2-1:5. The material is functional, and the printed 3D product has the capability of self-deforming and restoring the time dimensionality; the material has good cooling forming performance, and the hard-segment part can rapidly form a physical cross-linking point in the temperature difference range of melt extrusion; the contained stationary phase and restoration phase double components are wide in material selection and low in price, a preparation process is simple, the defects that synthetic raw materials are expensive, the process is complex and the like in the prior art can be overcome, and the material is suitable for large-scale production.
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