Abstract: A poly(urea-ureathane) based on polydimethyl siloxane is prepared by reacting an amino-terminated polydimethyl siloxane with polyisocyanate to form a prepolymer of poly(urea-urethane), and reacting the prepolymer and a chain extender in the presence of a catalyst. The resulting poly(urea-urethane) contains about 5-65 wt % of hard segments, and has a surface resistance of about 10-150 M? at high relative humidity, so that it can be used in anti-static electricity and electrostatic discharge shielding.

Abstract: A composite bipolar plate of polymer electrolyte membrane fuel cells (PEMFC) is prepared as follows: a) preparing a bulk molding compound (BMC) material containing a vinyl ester resin and a graphite powder, the graphite powder content of BMC material ranging from 60 wt % to 80 wt %, based on the compounded mixture; b) molding the BMC material from step a) to form a bipolar plate having a desired shape at 80-200° C. and 500-4000 psi, wherein the graphite powder is of 40 mesh-80 mesh.

Abstract: A poly(urea-ureathane) based on polydimethyl siloxane is prepared by reacting an amino-terminated polydimethyl siloxane with polyisocyanate to form a prepolymer of poly(urea-urethane), and reacting the prepolymer and a chain extender in the presence of a catalyst. The resulting poly(urea-urethane) contains about 5-65 wt % of hard segments, and has a surface resistance of about 10-150 M&OHgr; at high relative humidity, so that it can be used in anti-static electricity and electrostatic discharge shielding.

Abstract: A polysiloxane-urethane macromonomer having an unsaturated bond on one end thereof was co-polymerized with acrylic acid or acrylate monomers to form a copolymer having polysiloxane-urethane groups as a side chain thereof.

Abstract: The invention provides a technique for improving the flexibility of a cured epoxy resin. An isocyanate terminated polydimethylsiloxane urethane as a modifier is grafted to an epoxy resin. The modified epoxy resin after being cured exhibits an improved flexibility.

Abstract: Modified resole and novolac type phenolic resins which are toughened by poly(alkylene oxide) are disclosed. The modified resole type phenolic resin is prepared by the following steps: mixing a poly(alkylene oxide) having a weight average molecular weight of 100,000.about.8,000,000 and phenol in a weight ratio of poly(alkylene oxide): phenol=1.5:1.about.1:1 at an elevated temperature to form a glutinous mixture; mixing the glutinous mixture with an acid catalyst to obtain a viscous mixture having a relatively low viscosity compared to the glutinous mixture; and mixing the viscose mixture with a resole type phenolic resin. The modified novolac type phenolic resin is prepared by directly mixing the glutinous mixture with a liquid novolac type phenolic resin. The amount of the poly(alkylene oxide) mixed is 2.about.10 wt % based on the phenolic resin.

Abstract: A method for preparing a thermoplastic resin composite sheet product reinforced by oriented and discontinuous long fibers comprises a first step in which a plurality of prepreg pieces of a fiber-reinforced thermoplastic resin composite are fed to a horizontal sieve plate in vibration. The prepreg pieces are then caused by the vibration of the sieve plate to fall through the parallel ditches of the sieve plate on a mold plate or thermoplastic resin sheet product located under the sieve plate. The prepreg pieces deposited on the mold plate or thermoplastic resin sheet product are subsequently subjected to heating and pressing such that a thermoplastic resin composite sheet product reinforced by the oriented discontinuous long fibers is formed.