Synthesis and gas permeation properties of thermally rearranged poly(ether-benzoxazole)s with low rearrangement temperatures
作者:Yunhua Lu、Jianhua Zhang、Guoyong Xiao、Lin Li、Mengjie Hou、Junyi Hu、Tonghua Wang
DOI:10.1039/d0ra00145g
日期:——
dianhydride (BTDA) and 4,4′-(hexafluoroisopropylidine)diphtalic anhydride (6FDA) followed by thermal imidization. The corresponding thermally rearranged (TR) membranes were obtained by solid state thermal treatment at high temperature under a nitrogen atmosphere. The chemical structure, and physical, thermal and mechanical properties of the HPEI precursors were characterized. The effects of heat treatment
根据我们的改进方法成功合成了二胺单体9,9-双[4-(4-氨基-3-羟基苯氧基)苯基]芴(bis-AHPPF)。以双-AHPPF二胺与1,2,3,4-环丁四甲酸二酐(CBDA)、均苯四甲酸二酐( PMDA)、3,3',4,4'-联苯四甲酸二酐(BPDA)、3,3',4,4'-氧联二邻苯二甲酸酐(ODPA)、3,3',4,4'-二苯甲酮四甲酸二酐(BTDA) )和 4,4'-(六氟异丙啶)二邻苯二甲酸酐 (6FDA),然后进行热酰亚胺化。通过在氮气气氛下高温固相热处理获得相应的热重排(TR)膜。对 HPEI 前体的化学结构以及物理、热和机械性能进行了表征。还研究了热处理温度和二酐对聚醚苯并恶唑(PEBO)膜气体传输性能的影响。结果发现,这些 HPEI 显示出优异的热性能和机械性能。所有HPEI前体在N 2气氛中以低重排温度进行热转化。PEBO膜的透气率随着热处理温度的升高而增加。当HPEI-6FDA在450℃处理1小时时,膜的H