The second polyimide polymer is prepared with aromatic tetracid dihydride and aromatic diisocyanate and through a one-step condensation reaction in organic solvent and under the action of catalyst.
第种
酰亚
物是芳香族
酐与芳香族
异氰
酯,在有机溶剂中,在催化剂的作用下,
步法缩
反应制备得到;