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采用毛细管流变仪对熔融聚合耐高温聚酰胺(PA)的流变性能进行了研究。结果表明:熔融聚合耐高温聚酰胺PA10T、PA10T/11皆为假塑性流体,其非牛顿指数随着温度的升高而增加;表观黏度都随着剪切速率或剪切应力的增加而降低;随着剪切应力的增大,黏流活化能减小,表观黏度对于温度的敏感性减弱;与PA10T相比,PA10T/11通过引入第三单体11-氨基十一酸能有效地提高表观黏度对剪切应力、剪切速率和温度的敏感性,从而改善了PA10T的加工性能。利用DMA和DSC对PA10T、PA10T/11进行了分析,结果表明,PA10T引入第三单体11-氨基十一酸后,能提高其分子链的柔顺性,改善PA10T的加工性能。
The rheological properties of high temperature polyamide (PA) melt-polymerized were investigated by capillary rheometer. The results show that all of PA10T and PA10T / 11 are all pseudoplastic fluid. The non-Newtonian index increases with the increase of temperature. The apparent viscosity decreases with the increase of shear rate or shear stress ; With the increase of shear stress, the activation energy of viscous flow decreases, and the sensitivity of apparent viscosity to temperature decreases. Compared with PA10T, PA10T / 11 can effectively Improve the apparent viscosity of shear stress, shear rate and temperature sensitivity, thereby improving the processing performance of PA10T. The results of PA10T and PA10T / 11 were analyzed by DMA and DSC. The results showed that the introduction of the third monomer 11-aminoundecanoic acid PA10T can improve the flexibility of the molecular chain and improve the processing performance of PA10T.