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采用流变仪对酚酞聚芳醚酮(PEKC)-双马来酰亚胺(BMI)树脂体系的流变特性的时间和温度依赖性进行了研究,发现:BMI树脂凝胶点对频率有依赖性,而tanδ对频率无依赖性;PEKC-BMI复合树脂体系的黏度增大主要是由于BMI对PEKC的溶解与BMI的热固化。相比较110℃和130℃两种条件,在较高温度时复合树脂体系的黏度增大主要是热固化的影响;随注胶温度提高,复合体系的凝胶时间随PEKC含量的增加而快速缩短,在较高注胶温度下凝胶模量增大较慢,在较低注胶温度下凝胶时模量随PEKC含量的增加而提高较快;随着复合树脂体系中PEKC含量的增加,该体系的凝胶活化能由4.9kJ/mol增大到65.9kJ/mol,表明该体系的凝胶化作用对温度的敏感性增大。
The rheological properties of phenolphthalein poly (aryl ether ketone) (PEKC) -bismaleimide (BMI) resin were investigated by rheometer. The results showed that the gel point of BMI resin was frequency-dependent While the tanδ has no dependence on frequency. The viscosity increase of PEKC-BMI composite resin system is mainly due to the dissolution of PEKC by BMI and the thermal curing of BMI. Compared with 110 ℃ and 130 ℃, the increase of the viscosity of the composite resin system at higher temperature is mainly influenced by the thermal curing. With the increase of the injection temperature, the gel time of the composite system quickly shortened with the increase of PEKC content , The gel modulus increased slowly at higher injection temperature, and the modulus increased rapidly with the increase of PEKC content at low injection temperature. With the increase of PEKC content in the composite resin system, The gel activation energy of the system increased from 4.9 kJ / mol to 65.9 kJ / mol, indicating that the gelation of the system increased the temperature sensitivity.