In molding of carbon fiber reinforced thermoplastics (CFRTP), resin impregnation behavior to fiber yarns is very important because higher viscosity of molten thermoplastics inhibites resin impregnation to the interspace among fibers. Resultant resin un-impregnation causes lower mechanical properties of CFRTP. The purpose of this study was to clarify the relation among molding method, molding conditions and resin impregnation to fiber yarns experimentally and analytically. In this study, CFRTPs using continuous carbon fiber yarn as a reinforcement and a thermoplastic polyimide which is excellent in heat resistance as a matrix resin were produced by Micro-Braiding, Film Stacking and Powder method. In addition resin impregnation was modeled based on Darcy’s law and continuity condition. As a result, analytical resin impregnation prediction showed good agreements with the experimental results in all the producing methods and molding conditions. In addition, the void content in the molded CFRP could be greatly reduced by pressurizing cooling.

中文翻译：

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连续碳纤维增强热塑性聚酰亚胺复合材料中树脂浸渍行为的实验和分析研究

在模制碳纤维增强热塑性塑料（CFRTP）中，树脂对纤维纱的浸渍行为非常重要，因为熔融热塑性塑料的较高粘度会抑制树脂对纤维间空隙的浸渍。最终的树脂未浸渍会导致CFRTP的机械性能降低。这项研究的目的是通过实验和分析来阐明成型方法，成型条件和树脂对纤维纱的浸渍之间的关系。在本研究中，通过微编织，薄膜堆放和粉末法生产了使用连续碳纤维纱线作为增强材料和耐热性优异的热塑性聚酰亚胺作为基质树脂的CFRTP。另外，树脂浸渍是基于达西定律和连续性条件建模的。结果是，在所有的生产方法和成型条件下，分析树脂的浸渍预测结果与实验结果吻合良好。另外，通过加压冷却可以大大减少模制CFRP中的空隙含量。