Chung Shan Institute of Science and Technology

Jeng-Cheng Yang

Chen-Chi Martin Ma

Hon-Bin Chen

Chin-Yih Chen

Te-Chuan Chang

Yaw-Shun Hong

Yu-Tan Wang

The method of the present invention includes grafting a glycidyl alkylene trialkoxy silane to a novolac phenolic resin in an organic solvent to form a modified novolac phenolic resin; mixing a tetralkoxy silane, an acid and water with the resulting organic solution containing the modified novolac phenolic resin, wherein hydrolysis and condensation reactions are carried out to form a &#x2014;Si&#x2014;O&#x2014;Si&#x2014; bonding; adding a curing agent for novolac phenolic resin to the resulting reaction mixture; evaporating the organic solvent and acid from the resulting mixture and heating the resulting mixture to form a novolac phenolic resin/silica hybrid organic-inorganic nanocomposite.

Method for preparing a novolac phenolic resin/silica hybrid organic-inorganic nanocomposite

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&#x3a9; at high relative humidity, so that it can be used in anti-static electricity and electrostatic discharge shielding.

Process for preparing poly(urea-urethane)

In the present invention, vinylimidazole and &lsqb;3-(methacryloxy)propyl&rsqb;trimethoxysilane are copolymerized to form a modified polyvinylimidazole, which then undergoes hydrolysis and condensation reactions with water and tetramethoxysilane to prepare a hybrid of polyvinylimidazole and silica. Experimental analyses show that covalent bondings exist between the modified polyvinylimidazole and silica in the hybrid.

Method of preparing a hybrid of polyvinylimidazole and silica

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.

Polysiloxaneurethane-poly(acrylic acid)/polyacrylate copolymer and method for making the same

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.

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Tao-Yuan, Taiwan

Jeng-Cheng Yang