SYNTHESIS AND MESOMORPHIC PROPERTIES OF FISHBONE-LIKE LIQUID-CRYSTALLINE POLYSILSESQUIOXANES .2. IMINE-BASED SIDE-CHAIN MESOGENIC POLYSILSESQUIOXANES

Authors
XIE P XIE ZS WAN YZ JIN SZ DAI DR HOU GA LIU DS ZHANG RB
Citation
P. Xie et al., SYNTHESIS AND MESOMORPHIC PROPERTIES OF FISHBONE-LIKE LIQUID-CRYSTALLINE POLYSILSESQUIOXANES .2. IMINE-BASED SIDE-CHAIN MESOGENIC POLYSILSESQUIOXANES, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 289, 1996, pp. 59-68
Citations number
15
Categorie Soggetti
Crystallography
Journal title
Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals → ACNP
ISSN journal
1058725X
Volume
289
Year of publication
1996
Pages
59 - 68
Database
ISI
SICI code
1058-725X(1996)289:<59:SAMPOF>2.0.ZU;2-1
Abstract
Fishbone-like, imine-based liquid crystalline polysilsesquioxanes (FP) including homopolymeric H-FP and copolymeric (C-FP) have been first s ynthesized by hydrosilylation reaction of a vinyl-terminated imine mes ogen compound with highly ordered ladderlike polyhydrosilsesquioxane [ H-T] and random copolymethylhydrosilsesquioxane [MH-T] in the presence of Cp(2)PtCl(2) used as the catalyst. This novel thermotropic side-ch ain liquid ctystalline polymer with Mw of 10(5-6) can form a transpare nt uniform film on melting. Their clearing temperature Tcl and mesopha se range Delta H are much higher than those of the corresponding comb- like, imine-based liquid crystalline polysiloxane (single main chain) by about 200 degrees C.