Abstract:
A poly(amide-imide) copolymer that is a reaction product of a substituted or unsubstituted linear aliphatic diamine including two terminals, a diamine represented by Chemical Formula 1, a dicarbonyl compound represented by Chemical Formula 2, and a tetracarboxylic acid dianhydride represented by Chemical Formula 3: wherein, in Chemical Formulae 1 to 3, A, R3, R10, R12, R13, X, n7 and n8 are the same as defined in the specification.
Abstract:
A polyimide film having tensile modulus of greater than or equal to about 5 gigapascals, and yellowness index of less than 2.5, when measured at a thickness of the film between 50 micrometers to 100 micrometers, wherein the polyimide film is a reaction product of a combination including an aromatic dianhydride and an aromatic diamine, wherein the aromatic dianhydride includes 4,4′-oxydiphthalic anhydride.
Abstract:
A flexible plastic substrate includes a film including a poly(amide-imide) copolymer; and a hard coating layer disposed on a first surface of the film, wherein the hard coating layer includes a crosslinked siloxane copolymer, and wherein the flexible plastic substrate has pencil hardness of greater than or equal to 2H under a vertical load of 1 kilogram according to ASTM D3363, a total light transmittance of greater than or equal to about 89% in a wavelength region of 350 nanometers to 750 nanometers.
Abstract:
A poly(amide-imide) copolymer film having a tensile modulus of greater than or equal to 5.4 GPa, and a yellowness index of less than or equal to 3.6, wherein the poly(amide-imide) copolymer film is a reaction product of an aromatic dianhydride including biphenyl tetracarboxylic dianhydride and 4,4′-hexafluoroisopropylidene diphthalic dianhydride, an aliphatic dianhydride including 1,2,3,4-cyclobutane tetracarboxylic dianhydride, an aromatic diamine including 2,2-bis(trifluoromethyl) benzidine, and an aromatic dicarbonyl compound including terephthaloyl dichloride.
Abstract:
A poly(imide-amide) copolymer, which is a product of a reaction between a diamine including an amide structural unit-containing oligomer represented by Chemical Formula 1 and a dianhydride represented by Chemical Formula 3: wherein, groups and variables in Chemical Formulae 1 and 3 are the same as described in the specification.
Abstract:
A poly(amide-imide) copolymer including a structural unit represented by Chemical Formula 1; a structural unit represented by Chemical Formula 2, and/or an amic acid precursor structural unit which forms the structural unit represented by Chemical Formula 2 through imidization; and a structural unit represented by Chemical Formula 3, and/or an amic acid precursor structural unit which forms the structural unit represented by Chemical Formula 3 through imidization, wherein the poly(amide-imide) copolymer has a modulus of greater than or equal to about 5.5 giga Pascals after being cured, a yellowness index YI of less than or equal to about 3.5, and an increase in yellowness index ΔYI of less than or equal to about 0.7 after being exposed to ultraviolet light for 72 hours: wherein in Chemical Formulae 1 to 3, groups and variables are the same as described in the specification.
Abstract:
Provided are a polymer including a first repeating unit represented by Formula 1, a resist composition including the polymer, and a method of forming a pattern using the resist composition: wherein descriptions of L11 to L14, a11 to a13, A11, X11, R11, R12, b12 and p in Formula 1 are provided in the present specification.
Abstract:
A poly(amide-imide) copolymer including a reaction product of at least one tetracarboxylic acid dianhydride, at least one diamine, and at least one dicarboxylic acid derivative, wherein the at least one tetracarboxylic acid dianhydride includes a tetracarboxylic acid dianhydride represented by Chemical Formula 1, the at least one diamine includes a diamine represented by Chemical Formula 2, and the at least one dicarboxylic acid derivative includes a dicarboxylic acid derivative represented by Chemical Formula 3: wherein, R1 to R3, X1 and X2 are the same as defined in the specification.
Abstract:
A polyimide film, which is a reaction product of a diamine including an amide structural unit in an amount of greater than about 0 mol % and less than or equal to about 80 mol % and an aromatic dianhydride, wherein the polyimide film has a Martens hardness of about 14 N/mm2 to about 120 N/mm2 at a thickness of about 30 μm to about 100 μm.
Abstract:
A stacked transparent film includes a polymer film including at least one of an amide structural unit and an imide structural unit, wherein the polymer film has a refractive index of about 1.65 to about 1.75 at a 550 nanometer wavelength and an elastic modulus of greater than or equal to about 5.5 gigapascals; and at least one of a first coating layer on a first side of the polymer film and a second coating layer on a side opposite the first side of the polymer film.