连续玻纤增强聚丙烯熔融浸渍过程降黏研究

将不同配比的高黏度聚丙烯与低黏度聚丙烯共混制备高低黏度树脂混配基体，旋转流变测试结果显示低黏度聚丙烯的加入显著降低了共混体系的黏度。以高低黏度聚丙烯共混物为热塑树脂基体，采用熔融浸渍方法制备连续玻纤增强聚丙烯热塑预浸带。研究发现随着低黏度聚丙烯含量的增加，热塑树脂基体的加工性能明显提高，预浸带制品的孔隙率及纤维断裂率逐渐降低。将各组预浸带模压成型后进行力学测试，结果显示低黏度聚丙烯的加入使层压板层间剪切强度、弯曲强度、拉伸强度均出现小幅度下降，而对冲击强度基本无影响。结合加工性能及力学性能，低黏度聚丙烯质量分数10%时共混物的综合性能最佳。

Viscosity reduction of continuous glass fiber reinforced polypropylene prepared by melt impregnation

Different percentages of high viscosity polypropylene were blended with low viscosity polypropylene. Rotational rheological tests showed that the addition of low viscosity polypropylene significantly reduced the viscosity of high viscosity polypropylene. Continuous glass fiber reinforced polypropylene thermoplastic prepregs were prepared by the melt impregnation method using high and low viscosity polypropylene blends as the thermoplastic resin matrix. It was found that the processing performance of the thermoplastic resin matrix was improved by increasing the content of low viscosity polypropylene, whilst the porosity and fiber breaking rate of the prepreg decreased. Each group of prepregs was molded and mechanically tested. The results show that the addition of low viscosity polypropylene causes the interlaminar shear strength, flexural strength and tensile strength to decrease slightly, but has no effect on the impact strength. In terms of the combined processing performance and mechanical properties, adding 10% low viscosity polypropylene was found to give the best overall performance.