Investigation of Aromatic Polyester Synthesis by the Chain-Growth Polycondensation Method
作者:Akihiro Yokoyama、Ken-ichi Iwashita、Kyota Hirabayashi、Kazushige Aiyama、Tsutomu Yokozawa
DOI:10.1021/ma021449a
日期:2003.6.1
an initiator and a base, respectively. When the ratio of initiator 7h to monomer 1h was 20 mol %, the polycondensation proceeded in a chain-growth manner to give aromatic polyester having a controlled molecular weight and a low polydispersity. However, the polymerization of 1h with 10 mol % or less of 7h could not be controlled and gave step-growth polymer as well as chain-growth polymer. The model
研究了通过活化的4-羟基苯甲酸衍生物(1)的链增长缩聚反应合成芳族聚酯。当在CH 2 Cl 2中将3-芳基羰基-2-苯并噻唑酮衍生物与叔胺一起使用时,活性化合物(6和7)与酚亲核试剂(8)之间的酯形成模型反应给出了最佳结果。因此,我们设计并合成了3-(4-羟基-3-辛基苯甲酰基)-2-苯并噻唑酮(1h)作为单体。的中号Ñ -和中号瓦特/中号Ñ的聚合的γ变换曲线1H与引发剂的反应表明聚合物和单体之间的酯交换反应发生在聚合反应的后期。对碱和引发剂作用的研究表明,通过分别使用3-(4-苯甲酰氧基苯甲酰基)-2-苯并噻唑酮(7h)和二异丙基乙胺作为引发剂和碱,可以最小化引发剂末端的酯基转移反应。当引发剂7h与单体1h的比例为20mol%时,缩聚以链增长的方式进行,从而得到具有受控的分子量和低的多分散性的芳族聚酯。但是,1h与10mol%或更少的7h的聚合不能控制,得到了逐步增长的聚合物以及链增长的