玻纤布增强聚丙烯复合材料浸渍理论及实验研究

采用薄膜叠压法制备玻纤布增强高黏度聚丙烯热塑复合材料，研究了高黏度聚丙烯熔体浸渍玻璃纤维布过程。通过旋转流变测试分析，可知高黏度聚丙烯树脂熔体在浸渍过程中表现为非牛顿流体特性。以达西定律为理论基础，结合材料物性参数和工艺参数，推导了非牛顿流体浸渍玻璃纤维布的浸渍模型。在不同的浸渍压力与存留时间条件下对模型进行实验验证，理论值与实验值基本吻合。利用建立的浸渍模型分析了浸渍工艺对复合材料浸渍过程的影响，结果表明通过升高温度和提高压力等途径可减小浸渍时间。

Impregnation of glass fabric reinforced polypropylene

Glass fabric reinforced high viscosity polypropylene (PP) composites have been fabricated using a film stacking procedure. An impregnation model has been developed for the consolidation phase to predict the void fraction of the resulting composites. When impregnated with glass fibers, rheological measurements and analysis confirm that the high viscosity polypropylene melt shows non-Newtonian fluid properties. An impregnation model of a non-Newtonian fluid into glass fabric has been developed based on Darcy's law and takes into account the material properties and processing parameters. The impregnation model was validated by comparing the model predictions with the experimental values for a range of applied pressures and dwell times, and the results show that the experimental results are consistent with the predictions of the impregnation model . The impregnation procedure has been studied using the model and the results show that the impregnation time in the film stacking procedure can indeed be shortened significantly by increasing the processing temperature and increasing the applied pressure.