以聚甲基氢硅氧烷(PMHS)为主链,通过硅氢加成反应制备了具有不同液晶侧链长度的两个系列侧链胆甾型液晶聚合物(ChLCPs)。然后通过醚化反应获得了两个系列的胆甾型荧光液晶聚合物(FL-ChLCPs)。所获得的FL-ChLCPs具有优异的介晶性能和良好的光致发光性能。我们通过FT-IR确认了它们的化学结构,并且11 H NMR光谱,并通过TGA发现它们具有优异的热稳定性。我们通过POM,DSC和XRD对它们的介晶行为和热性能进行了表征,并确认所有聚合物均属于胆甾相。FL-ChLCPs在紫外光下发出不同强度的荧光,我们通过PL光谱发现了一些规律性。
以聚甲基氢硅氧烷(PMHS)为主链,通过硅氢加成反应制备了具有不同液晶侧链长度的两个系列侧链胆甾型液晶聚合物(ChLCPs)。然后通过醚化反应获得了两个系列的胆甾型荧光液晶聚合物(FL-ChLCPs)。所获得的FL-ChLCPs具有优异的介晶性能和良好的光致发光性能。我们通过FT-IR确认了它们的化学结构,并且11 H NMR光谱,并通过TGA发现它们具有优异的热稳定性。我们通过POM,DSC和XRD对它们的介晶行为和热性能进行了表征,并确认所有聚合物均属于胆甾相。FL-ChLCPs在紫外光下发出不同强度的荧光,我们通过PL光谱发现了一些规律性。
Liquid crystalline epoxy monomer and liquid crystalline epoxy resin
申请人:Cornell Research Foundation, Inc.
公开号:US05811504A1
公开(公告)日:1998-09-22
Monomers of formula (I) ##STR1## where ##STR2## is a mesogen, ##STR3## is a spacer, and --X is a group having an epoxy function exhibit a reduced tendency to undergo self-condensation via addition polymerization and afford liquid crystalline polymers upon condensation with a crosslinking agent.
Influence of Interim Alkyl Chain Length on Phase Transitions and Wide-Band Reflective Behaviors of Side-Chain Liquid Crystalline Elastomers with Binaphthalene Crosslinkings
A series of side-chain polysiloxane liquid crystalline elastomers, E-Cm (where m is the number of carbon atoms in the interim alkyl groups, and m = 4, 6, 8, 10), with binaphthalene derivatives as crosslinkings, were designed and synthesized. The mesophase structures of these elastomers were dependent on the value of m. The elastomers with m <= 8 could form cholesteric (Ch) phases, while both smectic A and Ch phases could be formed for the elastomer with m = 10. Blue phases can be achieved when m >= 8. Besides, the helical twisting power (HTP) of all the elastomers exhibits a turning point with changing temperature. Both the turning temperature and HTP have an apparent dependence on the value of m. By adjusting the interim alkyl chain length in the elastomers, both visible and near-infrared light wide-band reflective films can be obtained. The broadband reflection mechanism was confirmed by SEM investigations.
Kossmehl, G.; Gerecke, B.; Harmsen, N., Molecular Crystals and Liquid Crystals Science and Technology, Section A: Molecular Crystals and Liquid Crystals, 1995, vol. 269, p. 39 - 54
作者:Kossmehl, G.、Gerecke, B.、Harmsen, N.、Schroeder, F.、Vieth, H. M.
DOI:——
日期:——
Symmetrische fl�ssigkristalline Bibenzyl-4,4?-diylbisbenzoate, Synthese und Charakterisierung [1,2]