support from the Key Technology R&D Program of China(2011BAD11B05);the National Nonprofit Institute Research Grant of Chinese Academy of Agricultural Sciences(2011-28,2013-17);supported by the National Basic Research Program of China(973 Program,2003CB615701);the National Natural Science Foundation of China(20576059,20676067,31572204);the China Petroleum&Chemical Corporation(SINOPEC Foundation,X505002);the China National Petroleum Corporation(CNPC)InnovationFoundation(05051143)
Polyimide(PI) is a type of important membrane material. A soluble polymer was synthesized from 4,4′-(hexafluoroisopropylidene) diphthalic anhydride(6FDA) and 2,2-bis[4-(4-aminophenoxy) phenyl] hexafluoroprop...