Synthesis and Characterization of Highly Soluble and Oxygen Permeable New Polyimides Bearing a Noncoplanar Twisted Biphenyl Unit Containing <i>tert</i>-Butylphenyl or Trimethylsilyl Phenyl Groups
作者:Hyung-Sun Kim、Yun-Hi Kim、Seung-Kuk Ahn、Soon-Ki Kwon
DOI:10.1021/ma0214557
日期:2003.4.1
The two new dianhydrides, 2,2‘-bis(4‘ ‘-tert-butylphenyl)-4,4‘,5,5‘-biphenyltetracarboxylic dianhydride (BBBPAn) and 2,2‘-bis(4‘ ‘-trimethylsilylphenyl)-4,4‘,5,5‘-biphenyltetracarboxylic dianhydride (BTSBPAn), composed of a noncoplanar twisted biphenyl unit containing tert-butylphenyl or trimethylsilylphenyl groups were prepared. Two series of new organosoluble polyimides were prepared from the dianhydride
两个新的二酐2,2'-双(4''-叔丁基苯基)-4,4',5,5'-联苯四甲酸二酐(BBBPAn)和2,2'-双(4''-三甲基甲硅烷基苯基) -4,4' ,5,5'-联苯四甲酸二酐(BTSBPAn),含有非共面扭曲联苯单元构成的叔制备了丁基丁基或三甲基甲硅烷基苯基。由二酐和芳族二胺通过常规的聚酰胺酸反应,然后进行化学亚胺化和高温一步聚合,制得了两个系列的新型有机可溶性聚酰亚胺。聚合物的结构通过各种光谱技术确认。所得聚合物的重均分子量和多分散性分别在60 400-332 400和1.87-3.51的范围内。聚酰亚胺在各种有机溶剂(如氯仿和THF)中显示出良好的溶解性。通过热重分析测量,聚酰亚胺在氮气中在540-550°C时显示出5%的重量损失。聚酰亚胺显示出高的T g和良好的机械性能。薄膜的透氧系数(P O 2)和氧对氮的渗透选择性(P O 2 / P N 2)分别在31-110 barrer和2