financially supported by the National Key R&D Program of China(No.2017YFB0308300);the National Basic Research Program of China(No.2014CB643603)
A series of polyamic acid copolymers(co-PAAs) with para-hydroxyl groups was synthesized using two diamine monomers,namely p-phenylenediamine(p-PDA) and 5-amino-2-(2-hydroxy-5-aminobenzene)-benzoxazole(m-pHBOA), of dif...