作者:Jeonghan Kim、Bruce M. Novak、Alan John Waddon
DOI:10.1021/ma0493527
日期:2004.11.1
derivatives. Poly(N-6-((4‘-methoxyphenylazo)phenyl-4-oxy)hexyl-N‘-n-hexylguanidine) (poly-IV), one of combined liquid crystalline structures (liquid crystalline backbone plus liquid crystalline side chains), displayed a lyotropic nematic texture presumably due to the strong dipolar−dipolar interaction between the main chain and side chains that folds the appendages parallel to the molecular axis. Poly(N-12
制备了改性的聚胍,并使用光学偏振显微镜和X射线衍射研究了它们的液晶性质。检查的参数包括手性,侧链长度的均一性和连接的侧链液晶元。如果重复单元上的侧链相同,则聚合物在溶液和固态下均具有更有序的结构。侧链的均匀长度也很重要。聚(Ñ,Ñ “ -二Ñ -hexylguanidine),聚我,表现出对比度的溶致近晶纹理聚向列纹理(ñ - (外消旋) - 2 -苯乙基) - ñ ” -methylguanidine)(聚-(rac -II))。光学纯的聚( N -(( R) -2-苯乙基) -N'-甲基胍)(聚( R- II))形成胆甾型结构,而相应的外消旋聚胍poly-( rac- I I),形成向列纹理。另外,聚( R -II)在低于聚-I或聚-( rac- II)的临界浓度下表现出中间相,这意味着聚( R- II)比这两个其他衍生物更硬。聚( N -6-((4 '-methoxyphenylazo)苯基-4-氧基)己基-