Influence of Interim Alkyl Chain Length on Phase Transitions and Wide-Band Reflective Behaviors of Side-Chain Liquid Crystalline Elastomers with Binaphthalene Crosslinkings
Influence of Interim Alkyl Chain Length on Phase Transitions and Wide-Band Reflective Behaviors of Side-Chain Liquid Crystalline Elastomers with Binaphthalene Crosslinkings
复制标题
DOI：
10.1021/ma300618t
复制
发表时间：
2012-06
期刊：
影响因子：
5.5
通讯作者：
Xiaojuan Wu;H. Cao;Renwei Guo;Kexuan Li;Feifei Wang;Yanzi Gao;Wenhuan Yao;Lanying Zhang;Xiaofang Chen;Huai Yang
中科院分区：
文献类型：
--
作者：
Xiaojuan Wu;H. Cao;Renwei Guo;Kexuan Li;Feifei Wang;Yanzi Gao;Wenhuan Yao;Lanying Zhang;Xiaofang Chen;Huai Yang
设计合成了一系列以联萘衍生物为交联剂的侧链聚硅氧烷液晶弹性体E-Cm（m为中间烷基的碳原子数，m = 4，6，8，10）。这些弹性体的中间相结构取决于m的值。m ≤ 8的弹性体可形成近晶A相和Ch相，m = 10的弹性体可形成近晶A相和Ch相。当m ≥ 8时，可获得蓝相。此外，所有弹性体的螺旋扭转力（HTP）随温度的变化都存在一个转折点。转变温度和热转变温度都与m值有明显的依赖关系。通过调节弹性体中过渡烷基链的长度，可以获得可见光和近红外光的宽带反射膜。通过SEM研究证实了宽带反射机制。
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.