US EPA

6929329 

Journal Article 

Precise synthesis of poly(silphenylenesiloxane)s with epoxy side functional groups by tris(pentafluorophenyl)borane as a catalyst 

Xue, Lei; Kawakami, Y; , 

2007 

1 

Polymer Journal
ISSN: 0032-3896 

SOC POLYMER SCIENCE JAPAN 

TOKYO 

39 

4 

379-388 

10.1295/polymj.PJ2006171 

WOS:000246869200012 

1,omega-Dimethylhydroxysilyl, -dimethylhydrosilyl, -dimethylmethoxysilyl -terminated tetramethylsil-phenylenesiloxane prepolymers were prepared by sequential palladium-catalyzed dehydrocoupling polymerization of 1,4-bis(dimethylsilyl)benzene with water, reduction with lithium aluminium hydride, and palladium-catalyzed methanolysis. 1,4-Bis[(glycidyl- or cyclohexene oxide-functionalized alkyl)methylhydrosilyl]benzene and methyldimethoxy-silanes with the same epoxy groups were synthesized by hydrosilylation of 1,4-bis(methyldihydrosilyl)benzene and methyldimethoxysilane with (terminal olefin-functionalized alkyl) substituted epoxides in the presence of platinum catalyst. 1,4-Bis[(glycidyl- or cyclohexene oxide-functionalized alkyl)methyl(hydroxy or methoxy)silyl]benzenes were obtained by hydrolysis and methanolysis of the hydrosilyl derivatives. Poly(silphenylenesiloxane)s with epoxy side groups were synthesized by hetero-polycondensation of the hydrosilane, hydroxysilane and methoxysilane functional groups in the prepolymer and 1,4-bis [(epoxy-functionalized alkyl)methylsilyl]benzene, or 1,1-dimethoxy(epoxy-functionalized alkyl)methylsilane in the presence of a catalyst. Tris(pentafluorophenyl)borane was found to be an excellent catalyst for the polymerization. Cross-linking a polymer with 1,4-diaminobenzene gave stretchable polymer film by solution cast method. 

palladium catalyst; tris(pentafuluorophenyl)borane; hydrosilylation; dehydrocoupling polymerization; poly(silphenylenesiloxane); epoxy side groups; cross-linked; polymer film