研究了二苯酮四酸二酐-二异氰酸甲苯酯-二异氰酸二苯甲烷酯共聚聚酰亚胺(P84)的N-甲基吡咯烷酮(NMP)溶液的流变性能。结果表明:P84质量分数为17%～21%的NMP溶液为切力变稀流体,在温度为40～60℃时,其非牛顿指数为0.80～0.98,随着P84浓度增加或温度降低,其溶液的非牛顿性增加;在低剪切速率下,P84浓度增加使纺丝溶液的粘流活化能增加;随着P84浓度的增加或温度的降低,纺丝溶液的结构粘度指数、储能模量、损耗模量、复数粘度均增大。 The rheological properties of benzophenone tetracarboxylic dianhydride-toluene diisocyanate-diphenylmethane diisocyanate copolymer (P84) in N-methylpyrrolidone (NMP) solution were studied. The results show that the NMP solution with P84 mass fraction of 17% ~ 21% is shear thinning fluid, and its non-Newtonian index is 0.80 ~ 0.98 at the temperature of 40 ~ 60 ℃. As the concentration of P84 increases or the temperature decreases, The non-Newtonian property of the solution increases; at low shear rate, the increase of P84 concentration increases the viscous flow activation energy of spinning solution; with the increase of P84 concentration or the decrease of temperature, the structural viscosity index of spinning solution, Volume, loss modulus, complex viscosity are increased.