%0 Journal Article
%T SYNTHESIS AND CHARACTERIZATION OF AN INORGANIC-ORGANIC HYBRID BENT-CORE LIQUID CRYSTAL WITH A CUBIC SILSESQUIOXANE CORE<br>无机-有机杂化树枝状香蕉形液晶化合物的合成与表征
%A PAN Qiwei
%A CHEN Xiaofang
%A SHEN Zhihao
%A FAN Xinghe
%A ZHOU Qifeng
%A <br>潘其维
%A 陈小芳
%A 沈志豪
%A 范星河
%A 周其凤
%J 高分子学报
%D 2008
%I 
%X An organic-inorganic hybrid bent-core liquid crystal(BCLC)with eight bent-core mesogens end-attached to inorganic polyhedral oligomeric silsesquioxanes(POSS)cores was synthesized and characterized to study how the inorganic cubic core may affect the liquid crystalline phase behavior and electro-optical properties of the BCLC.POSS-8BC was successfully synthesized by hydrosilylation reaction of Q_8MH_8 and 3'-4-(4-dodecyloxybenzoyloxy)-benzoyloxy]-4-(10-undecen-1-yloxy)benzoyloxybiphenyl with Pt(dvs)as catalyst in high yield.Well-defined chemical structure of POSS-8BC was confirmed by NMR,IR,elemental analysis,and GPC.Liquid crystalline phase behavior of this compound was investigated by differential scanning calorimetry,1D and 2D wide-angle X-ray diffractions,and small-angle X-ray scattering.Meanwhile,electro-optical characterization was carried out by applying a triangular wave electric field.Response current was measured,and texture change under the electric field was observed.Two bilayer antiferroelectric SmC phases can be confirmed for POSS-8BC.In the higher temperature LC phase,the arrangement of POSS cores in the layer is not ordered.It is a conventional SmC_ A2P_A phase with layer thickness of 8.0 nm.In the lower temperature LC phase,layer thickness decreases to 7.7 nm.POSS cores from a two-dimensionally ordered structure between two bilayers.It is a bilayer SmC_AP_A phase with inorganic nano-size mesophase dispersed in it.To our best knowledge,it is the first antiferroelectric LC phase with inorganic nano-size mesophase dispersed in it.
%K POSS
%K Bent-core liquid crystal
%K Inorganic-organic hybrid<br>六面体倍半硅氧烷
%K 香蕉形液晶
%K 无机一有机杂化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=6579068328FE643F&jid=15971983683C7643EE80F1CE621DEB60&aid=749E130CCC6FEA3CE9C53F1D14A0FB2F&yid=67289AFF6305E306&iid=DF92D298D3FF1E6E&sid=7D2B339649A57040&eid=E008F9AD6D4B96EF&journal_id=1000-3304&journal_name=高分子学报&referenced_num=1&reference_num=8