A Comparison of Poly(ether imide)s with 3-Phthalimide and 4-Phthalimide Units: Synthesis, Characterization, and Physical Properties
作者:G. C. Eastmond、J. Paprotny、R. A. Pethrick、F. Santamaria-Mendia
DOI:10.1021/ma0524732
日期:2006.10.1
Bis(ether anhydride)s with 3- or 4-phthalimide moieties were prepared by reacting 3- or 4-nitrophthalodinitrile, respectively, with several diols and converting the resulting bis(ether dinitrile)s to bis(ether anhydride)s. Selected dianhydrides were converted into poly(ether imide)s in a two-stage solution polymerization and imidization process. It was found that, in most cases, the dianhydrides with
具有3-或4-邻苯二甲酰亚胺部分的双(醚酐)通过分别使3-或4-硝基邻苯二甲腈与几种二醇反应并将所得的双(醚二腈)转化为双(醚酐)来制备。在两步溶液聚合和酰亚胺化过程中,将选定的二酐转化为聚(醚酰亚胺)。已发现,在大多数情况下,具有4-邻苯二甲酸酐单元的二酐可得到具有几种芳族二胺中任何一种的高分子量聚合物。相反,具有3-邻苯二甲酸酐单元的二酐主要得到低分子量产物。通过电喷雾电离质谱法对几种低分子量产物的检查表明,根据二胺的结构,产物由环状或线性的小的低聚物组成。由4,4′-双(4′′-氨基苯氧基)联苯(BAPB)和几种带有3-或4-邻苯二甲酸酐单元的双(醚酐)中的每一种制备一系列高分子量聚合物。酸酐具有异丙基或六氟异丙基单元或邻位-甲基或邻-叔二醇残基中的丁基取代基。这些聚合物的分子量和玻璃化转变温度为特征。研究了聚合物的气体渗透率,正电子an灭和介电弛豫行为,其性质与分子结构有关。介电弛