Synthesis and Characterization of Highly Soluble and Oxygen Permeable New Polyimides Based on Twisted Biphenyl Dianhydride and Spirobifluorene Diamine
作者:Yun-Hi Kim、Hyung-Sun Kim、Soon-Ki Kwon
DOI:10.1021/ma047433x
日期:2005.9.1
twisted noncoplanar structural feature confers an enhanced solubility of the polyimides because of a decrease in the degree of molecular packing and crystallinity while imparting a significant increase in both Tg and thermal stability by restricting segmental mobility. The new polyimides exhibit the high oxygen permeabilities (P(O2) = 18−121 barrer) and O2/N2 gas separation properties (P(O2)/P(N2)
获得了新颖的螺二芴二胺单体2,7-双氨基-2',7'-二叔丁基-9,9'-螺二芴。新型有机可溶性聚酰亚胺是由含有大量叔丁基和常规二酐以及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' ‘-trimethylsilylphenyl)-4,4’,5,5'-联苯四甲酸二酐(BTSBPAn),其由含有膨松非共面扭曲联苯单元的p -叔丁基苯基和/或p-三甲基甲硅烷基苯基通过高温一步聚合。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48 300-183 900和2.10-3.26的范围内。体积大且扭曲的非共面结构特征赋予了聚酰亚胺更高的溶解度,这是因为分子堆积程度和结晶度的降低,同时通过限制节段迁移率而显着提高了T g和热稳定性。新的聚酰亚胺显示出高的氧渗透性(P(O 2)= 18-121 barrer)和O 2