Synthesis and characterization of side chain polymer with helical PLLA segments containing mesogenic end group
作者:Hongru Chen、Qingbin Xue、Zhuohua Li、Lingmin Sun、Quanxuan Zhang
DOI:10.1016/j.polymer.2010.11.041
日期:2011.1
Series of mesogenic biphenol derivatives HO6OPPOn (n = 4,6,8) were prepared by asymmetric reaction and purified. Then HOLAxO6OPPOn were prepared with controlled molecular weights by adjusting the feed ratios of HO6OPPOn, SnOct2 catalyst and LLA by Ring-Opening Polymerization. P-AOLAxO6OPPOn materials were obtained in high yields by the free radical polymerization of polymerizable macromonomers of AOLAxO6OPPOn
通过不对称反应制备并纯化了一系列介晶双酚衍生物HO6OPPOn(n = 4,6,8)。然后通过开环聚合调节HO6OPPOn,SnOct 2催化剂和LLA的进料比来制备分子量可控的HOLAxO6OPPOn 。P-AOLAxO6OPPOn材料是通过将HOLAxO6OPPOn与丙烯酸在DCC / DMAP存在下酯化合成的AOLAxO6OPPOn的可聚合大分子单体进行自由基聚合而高收率获得的。它们的分子量通过1 H NMR和GPC表征。用差示扫描量热法和偏振光学显微镜法研究了它们的热行为。两个都发现AOLAxO6OPPOn和P-AOLAxO6OPPOn材料形成具有增加的T g,T m和T i以及更长的O-LLA段长度的LC 。AOLAxO6OPPOn的聚合也导致T g,T m和T i的增加。X射线衍射测量表明在这些材料中存在近晶相。O-LLA链段是CD光谱中的螺旋结构,这使得所得的聚合物材料成为具有巨大旋光能力的光学材料的理想选择。