In the polyester film according to an embodiment, the transmittance for a specific wavelength and the strain for a tensile load to certain ranges when exposed to UV light, whereby it is possible to enhance the UV durability and flexibility at the same time. Accordingly, the polyester film and the laminated sheet comprising the same can be applied to a cover of a flexible display device, in particular, a foldable display device to prevent the poor or deformed appearance or the occurrence of device defects during repeated folding and exposure to UV light for long-term use.

Disclosed herein is a high thermal resistant polyolefin-based separator including a coating layer containing polyamic acid. Specifically, the separator includes a polyolefin-based substrate film, and a coating layer containing polyamic acid formed on one or both surfaces of the polyolefin-based substrate film, wherein the polyamic acid contains one or more functional groups selected from the group consisting of a sulfone group, a trifluoromethyl group, an alkyl group, and a phenyl ether group. Also, disclosed herein is an electrochemical battery having improved thermal stability by using the separator including a coating layer containing polyamic acid.

In a first aspect, a polymer film includes a polyimide, wherein the polyimide includes two or more dianhydrides, including a first monomer that is a crankshaft monomer and a second monomer that is a rigid non-rotational monomer, and one or more diamines including a third monomer that is a flexible monomer. The crankshaft monomer and the flexible monomer include a combined 65 to 99 mol % of the total of all three monomers. The rigid non-rotational monomer includes 1 to 35 mol % of the total of all three monomers. The polymer film has a dielectric dissipation loss factor, D.sub.f, of 0.005 or less, a water absorption of 2.0% or less and a water vapor transport rate of 50 (g×mil)/(m.sup.2×day) or less.

Provided are a solid electrolyte composition including: an inorganic solid electrolyte having conductivity of an ion of metal belong to Group 1 or 2 in the periodic table; and a high polymer binder, in which the high polymer binder is formed of a polymer having a hard segment and a soft segment, a binder for all-solid-state secondary batteries, and an electrode sheet for batteries and an all-solid-state secondary battery each using the solid electrolyte composition.

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 cm.sup.3 (STP)/(m.sup.2.Math.24 h.Math.atm) or higher. Three-dimensional tissue can be formed via cell culture with the use of the cell culture substrate of the invention.

Provided are an imide-terminated prepolymer, a preparation method therefor, a curable resin composition, use thereof and a dual curing method. An end capped, imide-terminated prepolymer is mixed with at least one photopolymerizable ethylenic monomer, at least one photoinitiator and diamine, and optionally a pigment to form a curable resin composition, which, in a first step, is irradiated under conditions effective to polymerize the at least one ethylenic monomer. The irradiated composition is then heat-treated under conditions effective to cause a transimidation reaction between the prepolymer and the diamine to provide a solid polymer.

The present application relates to a polyamic acid composition, a method for preparing the polyamic acid composition, and a polyimide comprising the same, which provides a polyamic acid composition capable of implementing a low permittivity, and heat resistance and mechanical properties simultaneously, a method for preparing the polyamic acid composition and a polyimide comprising the same.

A dual-cure method for forming a solid polymeric structure is provided. An end-capped, imide-terminated prepolymer is combined with at least one photopolymerizable olefinic monomer, at least one photoinitiator, and a diamine, to form a curable resin composition, which, in a first step, is irradiated under conditions effective to polymerize the at least one olefinic monomer, thus forming a scaffold composed of the prepolymer and the polyolefin with the diamine trapped therein. The irradiated composition is then thermally treated at a temperature effective to cause a transimidization reaction to occur between the prepolymer and the diamine, thereby releasing the end caps of the prepolymer and providing the solid polymeric structure. A curable resin composition comprising an end-capped, imide-terminated prepolymer, at least one photopolymerizable olefinic monomer, at least one photoinitiator, and a diamine, is also provided, as are related methods of use.

A method for producing an aqueous polyimide precursor solution composition includes forming a polyamic acid by the reaction of a tetracarboxylic acid component and a diamine component in an aqueous solvent together with an imidazole in an amount of 1.6 mole or more per mole of the tetracarboxylic acid component of the polyamic acid.

Disclosed are a proton exchange membrane made of a crystalline sulfonated polyimide block copolymer, a preparation method and use thereof. The crystalline sulfonated polyimide block copolymer has a chemical structure as shown in Formula (I), in which Ar1 group is an aromatic group containing a naphthyl group, Ar2 group is an aromatic group containing at least one sulfonate group, and x is in the range of 5-100, m is in the range of 1-200, and n is in the range of 5-500.

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