dihydride

1.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.

二种聚酰亚胺聚合物是芳香族四酸二酐与芳香族二异氰酸酯，有溶剂中，催化剂的作下，一步法缩合反应制备得到；

2.The first polyimide polymer is prepared with aromatic fluoric diamine and aromatic tetracid dihydride and through a two-step condensation reaction in organic solvent and under the action of catalyst.

一种聚酰亚胺聚合物是芳香族含氟二胺与芳香族四酸二酐，有溶剂中，催化剂的作下，两步法缩合反应制备得到；