New diamine monomers bearing sulfone terminated pendant groups, as well as methods for making the same, are provided. The diamine monomers are useful toward making polyamide, polyimide, and poly(amide-imide) polymers and copolymers, which possess hygromorphic properties and demonstrate humidity driven motility.

The present invention relates to a polyimide precursor comprising a repeating unit represented by the following chemical formula (1): ##STR00001##
wherein A is a tetravalent group having at least one aliphatic six membered ring and no aromatic ring in the chemical structure, and B is a divalent group having at least one amide bond and an aromatic ring in the chemical structure; or A is an aliphatic tetravalent group and B is a divalent group having at least one chemical structure represented by the following chemical formula (2) in the chemical structure: ##STR00002##
and X.sub.1 and X.sub.2 are each independently hydrogen, a C.sub.1-6 alkyl group or a C.sub.3-9 alkylsilyl group.

A liquid crystal aligning agent composition for forming a liquid crystal alignment film that can exhibit excellent alignment and electrical characteristics and simultaneously having enhanced durability, a method for preparing a liquid crystal alignment film using the liquid crystal aligning agent composition, and a liquid crystal alignment film comprising an aligned and cured product of the liquid crystal aligning agent composition and a liquid crystal display device comprising the liquid crystal alignment film.

The present invention provides a polyimide-based copolymer and electronic component and field effect transistor comprising the same. The polyimide-based copolymer comprises a copolymer of dianhydride and heterocyclic diamine, wherein the heterocyclic diamine has two benzene rings, and there are two ether bonds, two thioether bonds, or one ether bond and one thioether bond between the two benzene rings. The novel polyimide-based copolymer of the invention has excellent thermal-mechanical stability, has potential application prospects, and can be used as a substrate for flexible electronics.

The present invention provides a polyimide comprising a structural unit, which comprises a first structural unit represented by formula (1) and a second structural unit represented by formula (2), wherein A, D and E are defined herein. A polyimide film formed by the polyimide has a low linear thermal expansion coefficient.

##STR00001##

A polymer and a resin composition thereof are provided. The polymer includes a first repeat unit represented by Formula (I) and a second repeat unit represented by Formula (II)

##STR00001##

wherein A.sup.1 is C.sub.24-48 alkylene, C.sub.24-48 alkenylene, C.sub.24-48 alkynylene, C.sub.24-48 alicyclic alkylene, C.sub.24-48 alicyclic alkenylene, or C.sub.24-48 alicyclic alkynylene. A.sup.2 and A.sup.4, independently having at least one reactive group, are independently C.sub.6-25 arylene, C.sub.4-8 cycloalkylene, C.sub.5-25 heteroarylene, divalent C.sub.7-25 alkylaryl, divalent C.sub.7-25 acylaryl, divalent C.sub.6-25 aryl ether, divalent C.sub.7-25 acyloxyaryl, or divalent C.sub.6-25 sulfonylaryl; and, A.sup.3 is substituted or unsubstituted C.sub.6-25 arylene, C.sub.4-8 cycloalkylene, C.sub.5-25 heteroarylene, divalent C.sub.7-25 alkylaryl, divalent C.sub.7-25 acylaryl, divalent C.sub.6-25 aryl ether, divalent C.sub.7-25 acyloxyaryl, or divalent C.sub.6-25 sulfonylaryl.

A polymer, a composition, and a polysiloxane-polyimide material thereof are provided. The polymer includes a first repeat unit and a second repeat unit. The first repeat unit has a structure represented by Formula (I) and the second repeat unit has a structure represented by Formula (II)

##STR00001##

wherein A.sup.1 and A.sup.3 are independently tetravalent moiety; A.sup.2 is a divalent moiety; n≥1; m≥1; R.sup.1 is independently hydrogen, C.sub.1-8 alkyl, C.sub.1-8 fluoroalkyl, C.sub.1-8 alkoxy, or C.sub.6-12 aryl; and R.sup.2 is independently hydrogen, C.sub.1-8 alkyl, C.sub.1-8 fluoroalkyl, C.sub.1-8 alkoxy, C.sub.6-12 aryl, or a reactive functional group.

The present disclosure is directed to methods of forming polyimide gels. The methods generally include forming a polyamic acid and dehydrating the polyamic acid with a dehydrating agent in the presence of water. The resulting polyimide gels may be converted to polyimide or carbon xerogels or aerogels. The methods are advantageous in providing rapid or even instantaneous gelation, which may be particularly useful in formation of beads comprising the polyimide gels. Polyimide or carbon gel materials prepared according to the disclosed method are suitable for use in environments containing electrochemical reactions, for example as an electrode material within a lithium-ion battery.

A polymer having excellent liquid crystal alignment and electrical properties and thus is suitable for use as a liquid crystal alignment agent, a liquid crystal alignment agent including the same, a liquid crystal alignment film formed from the liquid crystal alignment agent, and a liquid crystal display device including the liquid crystal alignment film are provided.

The invention relates to a stoichiometric salt of a tetracarboxylic acid and a diamine of the following general formula (I),

##STR00001##

wherein R.sub.1 is selected from tetravalent residues of butane, cyclobutane, cyclopentane, cyclohexane, tetrahydrofurane and benzophenone and R.sub.2 is selected from divalent residues of unbranched, branched or cyclic aliphatic hydrocarbons with 3 to 15 carbon atoms, with the proviso that the salt of the formula (I) is water-soluble and is selected from compounds (1) to (28); and to the polyimides prepared from these salts by polycondensation.