Well-Defined Star-Shaped Aromatic Polyamides from Chain-Growth Polymerization of Phenyl 4-(Alkylamino)benzoate with Multifunctional Initiators
作者:Ryuji Sugi、Yoshio Hitaka、Akihiro Yokoyama、Tsutomu Yokozawa
DOI:10.1021/ma0473420
日期:2005.6.1
ester moieties in the initiators and afforded polymers with high polydispersities. In contrast, initiator 3 having the benzyloxy spacers resulted in three-armed aromatic polyamide (I) with low polydispersity. Furthermore, the benzyloxy linkages of the core of I were cleaved by hydrogenolysis to yield a polymer with low polydispersity, the Mn of which was one-third that of I, indicating that I exactly
为了合成轮廓分明的星形芳族聚酰胺,三苯基苯-1,3,5-三羧酸酯(2a),四苯基苯-1,2,4,5-四羧酸酯(2b)和1,3,5-合成了三(4-苯氧基羰基苄氧基)苯(3),然后将其用作多功能引发剂,用于4-(辛基氨基)苯甲酸苯酯(1)的链增长聚合。从引发剂中的所有苯基酯部分开始,与2a或2b的聚合反应均无法顺利进行,从而得到具有高多分散性的聚合物。相反,具有苄氧基间隔基的引发剂3生成了三臂芳香族聚酰胺(I)的低分散性。此外,通过氢解裂解I的核心的苄氧基键,得到低多分散性的聚合物,其M n为I的三分之一,表明I恰好具有三个长度均匀且受控的臂链。然而,在[ 1 ] 0 / [ 3 ] 0的较高进料比下的聚合不仅提供了三臂聚合物,还提供了由1的自聚合形成的线性聚合物。