The effects of para-, meta- and ortho-monosubstituted azobenzene moiety in the side chain on phase behavior of mesogen-jacketed liquid crystalline polymers
作者:Chang-an Yang、Helou Xie、Guanqun Zhong、Hailiang Zhang
DOI:10.1016/j.polymer.2013.04.023
日期:2013.6
smecitc C (SmC)-like structure. Furthermore, the glass transition temperature (Tg), isotropic temperature (Ti) and liquid crystalline range (ΔT, from Tg to Ti) of the polymers decrease in the order, para > meta > ortho. It is very interesting phenomenon that the associated enthalpy changes of these polymers are also the same order, para > meta > ortho, which is different from those of MCLCPs and SCLCPs
研究了在侧链具有单取代的偶氮苯部分的三种不同的介晶夹层液晶聚合物。这些是聚(2,5-双[对-(4'-甲氧基-4-氧基己氧基偶氮苯)苄基]氧羰基}苯乙烯)(表示为PPABCS),聚(2,5-双[间位-(4' -甲氧基-4-氧基己氧基氧基偶氮苯)苄基]氧羰基}苯乙烯)(表示为PMABCS)和聚(2,5-双[邻-(4'-甲氧基-4-氧基己氧基氧基偶氮苯)苄基]氧羰基}苯乙烯)(表示为作为POABCS)。单体的化学结构通过1 H NMR,13 C NMR光谱和元素分析确认。聚合物的结构表征通过1进行使用差示扫描量热法(DSC),偏振光显微镜(PLM)以及一维和二维(1D,2D)宽的1H NMR光谱学和凝胶渗透色谱法(GPC)以及聚合物的相结构和转变进行了研究角X射线衍射。还研究了不同位置的单取代偶氮苯部分对聚合物液晶行为的影响。结果表明,含有单取代的偶氮苯部分的介晶夹层液晶聚合物的相变行为强