Shi Jian, Mizuno Mamoru, Bao Limin, Zhu Chunhong
Faculty of Systems Science and Technology, Akita Prefectural University, Akita 015-0055, Japan.
Faculty of Textile Science and Technology, Shinshu University, Nagano 386-8567, Japan.
Polymers (Basel). 2022 Feb 26;14(5):947. doi: 10.3390/polym14050947.
The mechanical properties of continuous fiber-reinforced thermoplastic (C-FRTP) composites are commonly lower than those of continuous fiber-reinforced thermosetting plastic (C-FRP) composites. We have developed a new molding method for C-FRTP. In this study, pre-impregnated materials were successfully prepared by polymer solution impregnation method and, finally, C-FRTP was fabricated. The viscosity of the thermoplastic matrix was decreased to approximately 3dPa×s, the same level of epoxy, and the fiber volume fraction was increased from approximately 45 to 60%. The cross-section of specimens were polished by an ion milling system and impregnation condition was investigated by scanning electron microscopy (SEM). The micrographs suggested that thermoplastic polymer was impregnated to every corner of the fiber, and no void was found on the cross-section. It revealed that void-free composites with perfect mechanical properties can be manufactured with this new molding method. All specimens were submitted to a mechanical measuring equipment, and the mechanical properties of the composite specimens were investigated. Mechanical analysis revealed that tensile property and flexural property of C-FRTP were enhanced up to the same level with C-FRP.
连续纤维增强热塑性塑料（C-FRTP）复合材料的机械性能通常低于连续纤维增强热固性塑料（C-FRP）复合材料。我们开发了一种用于C-FRTP的新型成型方法。在本研究中，通过聚合物溶液浸渍法成功制备了预浸材料，最终制成了C-FRTP。热塑性基体的粘度降低到约3dPa×s，与环氧树脂处于同一水平，纤维体积分数从约45%提高到60%。用离子研磨系统对试样的横截面进行抛光，并通过扫描电子显微镜（SEM）研究浸渍条件。显微照片表明，热塑性聚合物浸渍到了纤维的每个角落，并且在横截面上未发现空隙。结果表明，采用这种新型成型方法可以制造出具有完美机械性能的无空隙复合材料。所有试样都被送至机械测量设备，对复合试样的机械性能进行了研究。力学分析表明，C-FRTP的拉伸性能和弯曲性能提高到了与C-FRP相同的水平。
