Chemical compositions are provided having a structure in accordance with ##STR00001##
with the R group having a structure in accordance with ##STR00002##
R.sup.1 includes an alkyl group, R.sup.2 includes an alkylene group, and R.sup.3 includes an alkylene group in accordance with (CH.sub.2).sub.x with x≥2, and R.sup.4 includes the structure of Formula (II) or Formula (III). R.sup.5 includes a meta-substituted or para-substituted phenyl moiety. Additionally, elastomers produced by cross-linking the chemical composition of Formula (I) are provided.

The invention discloses a preparation method of a polyimide film having a low dielectric constant and high fracture toughness; in the method an aromatic diamine solution is firstly prepared, and then a poly(5-norbornene-2,3-dicarboxylic anhydride-alt-maleimide isobutyl polyhedral oligomeric silsesquioxane) and aromatic dianhydride are ground, uniformly mixed, added to the aromatic diamine solution, and stirred to obtain a poly(5-norbornene-2,3-dicarboxylic anhydride-alt-maleimide isobutyl polyhedral oligomeric silsesquioxane)/polyamic acid solution; the solution is uniformly applied on a clean glass sheet, then placed in a vacuum drying oven, cooled to room temperature, and then a film is peeled off in water by ultrasonic and dried under vacuum to obtain the desired product. The dielectric constant of the film obtained by the invention is reduced to 2.2, and the elongation at break is increased by 272%, the tensile breaking energy is increased by 285%, showing greatly improved elongation at break and fracture energy, and good fracture toughness.

Provided is a heat-curable resin composition exhibiting a superior handling property and workability in the form of a film, having a high adhesion to a base material, and capable of yielding a cured product with a low elasticity. The heat-curable resin composition contains: (A) 90 to 10 parts by mass of a silicone-modified epoxy resin; (B) 10 to 90 parts by mass of a maleimide compound having a weight-average molecular weight (Mw) of 2,500 to 50,000; and (C) a curing catalyst,
provided that a total of the components (A) and (B) is 100 parts by mass.

A polycarbonate-polysiloxane includes specific amounts of first carbonate units having the structure ##STR00001##
wherein R.sup.1 is a C.sub.6-C.sub.16 divalent aromatic group, second carbonate units having the structure ##STR00002##
wherein R.sup.2 is a C.sub.17-C.sub.40 divalent aromatic group having the structure ##STR00003##
wherein R.sup.f, R.sup.g, R.sup.h, R.sup.i, R.sup.j, R.sup.k, X.sup.b, j, m, n, x, and y are defined herein. The polycarbonate-polysiloxane is useful for forming thin extruded films, which in turn are useful for fabricating electrostatic film capacitors.

A separator for an electricity storage device comprising a silane-modified polyolefin, wherein silane crosslinking reaction of the silane-modified polyolefin is initiated when it contacts with the electrolyte solution, as well as a method for producing the separator.

The present invention relates to a method for preparing an ultraviolet (UV) curing polymethyl siloxane containing an acrylate structure: performing a Michael addition reaction with an amino silicone oil by means of an asymmetric diene acrylate ethylene glycol methacrylate, the double bond of asymmetric diene having a large difference in activity, and the acrylate structure preferentially undergoing addition with an amino group; thus, a methacrylic structure is successfully linked to a side chain of the methyl silicone oil, and a methyl silicone oil having a controllable structure and having a side group containing the methacrylate structure is prepared, the reaction having a high grafting rate; the described method is a high-efficiency, mild and controllable preparation method; a conventional compound photoinitiator is selected, and is coated on a substrate for UV curing, quickly curing at room temperature to form a film, and having the features of being clean and pollution-free.

An elastomeric article is provided that includes a composition having a silane-crosslinked polyolefin elastomer with a density less than 0.90 g/cm.sup.3. The elastomeric article can exhibit a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70 C.). The silane-crosslinked polyolefin elastomer can include a first polyolefin having a density less than 0.86 g/cm.sup.3, a second polyolefin having a crystallinity less than 40%, a silane crosslinker, a grafting initiator, and a condensation catalyst.

Porous hybrid inorganic/organic materials comprising ordered domains are disclosed wherein the ordered domains are ordered radially, and having the formula (A).sub.x(B).sub.y(C).sub.z (Formula I) or the formula [A].sub.y[B].sub.x (Formula III), wherein A, B, C, x, y and z in Formula I and A, B, x and y in Formula III are further defined herein, and wherein diffraction peak maxima observed for the material exhibit a 2 position that excludes diffraction peaks resulting from atomic-range order that are associated with amorphous material. Methods of making the materials and use of the materials for chromatographic applications are also disclosed.

There is provided a composite article comprising a composite material comprising 60 wt % to 98 wt % of a hydrolytically stable thermoplastic resin; and 1 wt % to 11 wt % long conductive metal fibers coated with a polymer selected from at least one of aromatic polycarbonates, aromatic polycarbonate alloys, aromatic polyethers, maleated polyolefins, semi-aromatic nylons, stabilized nylons, and combinations thereof.

A low-density gel product of the present disclosure has a skeleton containing a polysiloxane chain and an organic polymer chain. In the skeleton, the polysiloxane chain and the organic polymer chain are bonded to each other by covalent bonds at a plurality of positions on both of the chains with silicon atoms of the polysiloxane chain as bonding points. The organic polymer chain may be an aliphatic hydrocarbon chain. The polysiloxane chain may be a polyorganosiloxane chain. The low-density gel product of the present disclosure is a novel low-density gel product with improved mechanical properties including bending flexibility.