Abstract: In last twenty years, fiber reinforced thermoplastic composites have been widely studied in industrial world for their excellent toughness, repairability and recyclability. At present, most of manufacturing processes of fiber reinforced thermoplastic composites in industry are melt processing, such as stacking alternating layers of fiber textiles and polymer sheets, textiles made of powder coated fibers, co-mingled textiles that consist of both reinforcing and polymer fibers and partially or fully consolidated panels (semi-pregs and pre-pregs). These processes mainly focus on the thermoforming properties of resin polymers, and are supplemented by high temperature and high pressure to processing composite mate-rials. Because of the large molecules of resin, it is difficult to flow and to impregnate the fiber, which determines the low performance of the composite from the source. Therefore, the in-situ polymerization manufacturing technology of thermoplastic composites has become the latest hotspot research due to its low cost and high performance. Through the study of resin polymerization process, the influence of main parameters, such as temperature and pressure, in polymerization processes are learned. And it becomes bases of in-situ polymerization manufacturing technology of fiber reinforced thermoplastic composites. High quality fiber reinforced thermoplastic composites are prepared by in-situ polymerization around the fibers by using suitable resin and initiation system. The research of anionic polymerization of PA6 start at 1930s, this system requirements a very high level for controlling parameters of reaction conditions and reaction cleanliness. The researches on this problem develop of the earliest sealing mixing equipment, further develop of SRIM (Structural reaction injection molding) and VI (Vacuum infusion) technology. These technologies ensure the clean environment, very fine control on temperature and pressure, satisfies the requirement of the forming of high-performance materials. Furthermore, the manufacturing cycle is shortened to a few minutes, greatly improving the production efficiency. For PMMA in-situ polymerization researches, it is mainly concentrated in heat conduction, due to the very complex mass transfer and heat transfer processes in preparation of thick parts and large parts. Researchers designed a wide variety of initiator system, pay close attention to its reaction kinetics such as induction time and gel point. Some researchers have focused on the simulation of heat transfer and the prediction of the maximum thickness of composite materials. These studies have promoted the development of in-situ polymerization of PMMA resin and large integral hull structures are successfully manufactured. In addition, for PBT and other crystalline resins, the changes of their crystallization properties during the polymerization process were studied, which provided theoretical support for the manufacturing of this kind of resin. This paper reviews the progresses of fiber reinforcedthermoplastic composites in-situ polymerization manufacturing technology, describes of several commonly used manufacturing technologies, T-RTM (Thermoplastic resin transfer molding), SRIM and VI. These techniques are discussed respectively in cases, the key points and the characteristics of each technology are analyzed. Some other methods of in-situ polymerization manufacturing technology of thermoplastic composites are summarized. Finally, the general problems of in-situ polymerization manufacturing technologies of thermoplastic composites are discussed, and the development trend is prospected.
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2020, Vol. 34 
