以二苯硫醚二酐(TDPA)3种异构体的混合物(m-TDPA)和3,3',4,4'-三苯双醚四甲酸二酐(HQDPA)为二酐单体，4,4'-二氨基二苯醚(ODA)为二胺单体，邻苯二甲酸酐(PA)为封端剂，采用不同二酐比例通过一步法聚合制备了一系列热塑性聚硫醚酰亚胺共聚物，粘度控制在0.42~0.43 dL/g，并对其热性能、溶解性、熔体性能、力学性能进行分析。结果表明：制备的共聚物耐热性良好，玻璃化转变温度(Tg)为230~246℃，5%热分解温度在516~539℃，力学性能优异，在N-甲基吡咯烷酮(NMP)、N,N-二甲基乙酰胺(DMAc)和氯仿等极性溶剂中有良好的溶解性。引入HQDPA进行共聚可以提高共聚物的热稳定性和耐溶剂性，显著降低熔体粘度，共聚物具有良好的熔体流动性和熔体稳定性。
Using three isomeric diphenylthioether dianhydrides (m-TDPA) and 3,3',4,4'-hydroquinone diphthalic dianhydride(HQDPA) as dianhydride monomers, 4,4′-diamino diphenyl ether (ODA) as bisamine monomer, phthalic anhydride(PA) as blocking agent, we synthesized a series of thermoplastic copolyimide by one-step method with different dianhydride monomers ratio. The viscosity was controlled in 0.42~0.43 dL/g, and the thermal property, solubility, rheological, and mechanical properties of the copolyimides were analyzed. The results show that the copolyimides have good heat resistance and excellent mechani-cal properties, and their glass transition temperature(Tg) is 230~246℃, while their decomposition tempera-ture at 5% weight loss is 516~539 ℃. The copolyimides have good solubility in polar solvent such as NMP, DMAc, and CHCl3. Because of the introduction of HQDPA to copolymerization, the solvent resis-tance and thermal stability of the copolyimides increase, and the melt viscosity decreases significantly. The copolyimides have excellent melt fluidity and melt stability.
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