基于2,3,3＇,4＇-二苯醚四甲酸二酐可溶性聚酰亚胺的亚胺化方法

Imidization Method on Soluble Polyimide Based on 2,3,3',4'-Diphenyl Ether Tetracarboxylic Acid Dianhydride

采用2,3,3',4'-二苯醚四甲酸二酐(α-ODPA)与柔性二胺单体1,3-二(4-氨基苯氧基)苯(1,3,4-APB)合成了可溶性聚酰亚胺,其在N,N-二甲基乙酰胺(DMAc)、N-甲基吡咯烷酮(NMP)等极性溶剂中的溶解性得到提高,研究了亚胺化方法对基于α-ODPA的可溶性聚酰亚胺性能的影响和作用机制。结果表明,亚胺化方法对相对分子质量的影响是产生各项性能变化的根本原因,基于α-ODPA的聚酰亚胺适用于化学亚胺化方法,采用化学亚胺化方法能够得到的可溶性聚酰亚胺的数均相对分子质量为2. 68×10~4,5%热分解温度(T_(d5))为544. 7℃,玻璃化转变温度(T_g)为236. 1℃,热稳定性能良好。化学亚胺化聚酰亚胺树脂的拉伸强度为99. 99 MPa,冲击强度为102. 51 kJ/m^2,韧性性能优异。

The soluble polyimide was synthesized with 2,3,3＇, 4-diphenyl ether tetracarboxylic acid dianhydride （a-ODPA） and flexible diamine 1,3-bis（4＇aminophenoxyl） benzene （ 1,3,4-APB）, which enhanced the solubility of the polyimide in polar solvents such as N, N-dimethyl acetamide （DMAc） and N-methyl pyrrolidone（NMP）. The effects and mechanism of action on the soluble polyimide based on a-ODPA were studied through imidization methods. The results show that the influence of imidization methods on molecular weight is the root cause of various performance changes. The chemical imidization method is suitable for the polyimide based on a-ODPA. The average molecular weight of the soluble polyimide obtained by the chemical imidization method is 2. 678 ~ 104. 5 % thermal decomposition temperature Td5 is 544.7 ＊C and glass transition temperature is 236.1 ＊t2, revealing the good thermal stability l The tensile strength of chemical imidized polyimide is 99.99 MPa, and the impact strength is 102.51 kJ/ m2, which shows excellent toughness.