Abstract: One embodiment relates to a method for preparing a polyamide-imide film which is colorless and transparent and has good mechanical properties, easily and efficiently in terms of yield. Particularly, the embodiment relates to a preparation method capable of obtaining a polyamide-imide film of which the optical characteristics, mechanical properties and flexibility are harmoniously improved without complicated processes, by controlling the amount of imide repeating units and amide repeating units constituting the polyamide-imide film.

Abstract: A poly(amide-imide) copolymer that is a reaction product of a diamine represented by Chemical Formula 1, a tetracarboxylic acid dianhydride including a compound represented by Chemical Formula 2, and a compound represented by Chemical Formula 3: wherein, in Chemical Formulae 1 to 4, R1 to R4, A, and X are the same as defined in the specification.

Abstract: In a first aspect, a single layer polymer film includes 60 to 99 wt % of a crosslinked polyimide, having a gel fraction in the range of from 20 to 100% and a refractive index of 1.74 or less, and 1 to 40 wt % of a colorant. A surface of the single layer polymer film has been textured and has a maximum roughness (Spv) of 6 ?m or more, an L* color of 30 or less and a 60° gloss of 15 or less. In a second aspect, a coverlay for a printed circuit board includes the single layer polymer film of the first aspect. In third and fourth aspects, processes are disclosed for forming a single layer polymer film including a crosslinked polyimide film including a dianhydride and a diamine.

Abstract: A monomer represented by Chemical Formula 1: wherein, in Chemical Formula 1, R1, R2, A1, A2, L1, L2, o, p, q, and r are the same as defined in the detailed description.

Abstract: A polyamideimide resin having an isocyanate group blocked with a compound selected from the group consisting of alcohols, oximes and lactams, and having a carboxyl group blocked with a vinyl ether group-containing compound.

Abstract: The present invention discloses a method for preparing high-melt-strength polylactide resin by two-step reaction, which comprises the following steps: mixing polylactide resin and GMA to obtain a premix; mixing multifunctional reactive monomer, a peroxide initiator and organic solvent to obtain a monomer mixture; and adding the premix and the monomer mixture into a screw extruder in sections, after melting, blending, extruding, cooling, pelletizing and drying to obtain a high melt strength polylactide resin. The method of the present invention has a simple production process, can be adapted to large-scale industrial production, the graft modification reaction is rapid and controllable, and the obtained product is safe without residue and high in purity. The high-melt-strength polylactide resin has a low melt flow index, high complex viscosity and storage modulus, and is a green polymer material with wide application prospects.

Abstract: The present invention provides a polyimide composite having a structural formula of PI/Fe3O4-(?-CD-Ada)x, wherein x=3-5. One aspect of the invention provides a polyimide composite. By introducing Fe3O4 as a host material of an electromagnetic wave absorption material and introducing a guest material, a repairing property of the material itself is imparted by an interaction between the host material and the guest material. Therefore, the polyimide composite has an electromagnetic radiation shielding property and a self-repairing property.

Abstract: A method produces polyamide fine particles by polymerizing a polyamide monomer (A) in the presence of a polymer (B) at a temperature equal to or higher than the crystallization temperature of a polyamide to be obtained, wherein the polyamide monomer (A) and the polymer (B) are homogeneously dissolved at the start of polymerization, and polyamide fine particles are precipitated after the polymerization. Polyamide fine particles have a number average particle size of 0.1 to 100 ?m, a sphericity of 90 or more, a particle size distribution index of 3.0 or less, a linseed oil absorption of 100 mL/100 g or less, and a crystallization temperature of 150° C. or more. In particular, a polyamide having a high crystallization temperature includes fine particles having a smooth surface, a narrow particle size distribution, and high sphericity.

Abstract: A polyimide film according to the present invention can be effectively used as a substrate for a flexible display device without a deterioration in heat resistance even at a temperature of 350° C. or higher since a coefficient of thermal expansion (A) in the section of 100-350° C., of the polyimide film, and a coefficient of thermal expansion (B) in the section of 350-450° C., of the polyimide film, meet 0<B/A<2.

Abstract: The present invention relates to the production of a polyimide precursor, whereby, by using an amide-based organic solvent having a positive-number partition coefficient (Log P) and a density of at most 1 g/cm3, an interaction between the organic solvent and polyamic acid, which is a polyimide precursor, may be mitigated, thereby enabling the decrease of the viscosity of a polyimide precursor solution, and thus enabling a polyimide precursor solution having high solid content and low viscosity to be obtained.

Abstract: Compositions may include an EVA copolymer produced from ethylene, vinyl acetate, and one or more polar comonomers, wherein at least one of the one or more polar comonomers include an amine moiety. Methods may include preparing a polymer composition by adding ethylene, vinyl acetate and one or more polar comonomers to a reactor or extruder, wherein at least one of the one or more polar comonomers include an amine moiety; and reacting the ethylene, vinyl acetate and one or more comonomers to produce the polymer composition. Compositions may include an adhesive film composition that include at least one layer including a polymer produced from ethylene, vinyl acetate, and one or more polar comonomers, wherein at least one of the one or more polar comonomers include an amine moiety.

Abstract: The present invention provides a display substrate polyimide film having: remarkably improved insulation characteristics; inner pores, included in the polyimide film, of which the maximum size is 10 nm or less; and a high maximum dielectric breakdown voltage of 350 V/?m or more. The polyimide film according to the present invention has improved insulation characteristics so as to be capable of suppressing the generation of a current fluctuation of TFTs according to the long-term driving of a TFT device in a display such as an OLED, thereby enabling the deterioration of the contrast of a display to be reduced.

Abstract: The present invention provides a composite film and a preparation method thereof. The composite film includes polyimide and a dense silica layer formed on a surface of the polyimide.

Abstract: Provided are a liquid crystal alignment agent, a liquid crystal alignment film and a liquid crystal display element. The liquid crystal alignment agent at least comprises one of a polyamic acid solution and a polyimide solution. The polyamic acid solution is obtained by means of a polymerization reaction of diamine compound component A and dianhydride compound component B in a solvent, and the polyimide solution is obtained from the polyamic acid solution via a dehydration imidization treatment. The diamine component A at least comprises one of the diamine compounds represented by “formula 1”. The obtained liquid crystal alignment agent has a better liquid crystal alignment capability, an excellent effect on image sticking, and the effect that decomposition products resulting from light alignment are easy to remove.

Abstract: This invention provides a cell culture substrate comprising on its surface a fluorine-containing polymer that enables three-dimensional tissue culture. The cell culture substrate of the invention has a surface at least a part of which is composed of a resin composition comprising a fluorine-containing polymer having one or more fluorine atoms in a repeating unit and exhibits the oxygen gas permeability of 219 cm3 (STP)/(m2·24 h·atm) or higher. Three-dimensional tissue can be formed via cell culture with the use of the cell culture substrate of the invention.

Abstract: Textile compositions comprising at least one filamentous fungus are disclosed, as are methods for making and using such textile compositions. Embodiments of the textile compositions generally include at least one of a plasticizer, a polymer, and a crosslinker, in addition to the filamentous fungus. The disclosed textile compositions are particularly useful as analogs or substitutes for conventional textile compositions, including but not limited to leather.

Abstract: In one aspect, the present invention is a resin member comprising a copolymer of ethylene and an olefin having 3 or more carbon atoms, a straight-chain saturated hydrocarbon compound, and a gelling agent.

Abstract: An embodiment can provide a polyamide-imide film and a method for producing same, the film comprising a polyamide-imide polymer formed by polymerizing an aromatic diamine compound, an aromatic dianhydride compound and a dicarbonyl compound, wherein, in an XRD graph with a section in which 2?=8° to 32° as a baseline, the film shows a peak area of 50% or above around 2?=23° with respect to a peak area seen around 2?=15°.

Abstract: Examples of the present disclosure provide fluoropolymers and methods for forming and using such fluoropolymers. Fluoropolymers include polyfluorobenzoxazines and polyfluoroimides. Methods for forming polyphthalonitriles are also provided. The present disclosure is further directed to compositions containing one or more fluoropolymers and one or more metal oxides.

Abstract: Textile compositions comprising at least one filamentous fungus are disclosed, as are methods for making and using such textile compositions. Embodiments of the textile compositions generally include at least one of a plasticizer, a polymer, and a crosslinker, in addition to the filamentous fungus. The disclosed textile compositions are particularly useful as analogs or substitutes for conventional textile compositions, including but not limited to leather.