Abstract: Thermoplastic composite materials with high damage resistance and impact resistance obtained a rapid development, but the problems of impregnation between thermoplastic resin matrix and reinforcing materials hindered the promotion of thermoplastic composite materials. In order to improve the interface performance of thermoplastic composites, polyacrylate resin/glass fiber prepreg was fabricated by in-situ polymerization under the conditon of UV light, with methyl methacrylate, butyl acrylate, glycidyl methacrylate as monomer, with the unidirectional glass fiber as the reinforcing material. Composite materials were prepared by hot pressing. The composite resin content, thermal stability, mechanical properties and microstructure of composite were studied. The experimental results show that the thermal decomposition temperature of polyacrylate resin increases with the increase of GMA content. The resin content is stable in 30%. The glass transition temperature decreased with the increase of GMA content. The tensile strength and the flexural strength showed a trend of increasing at first and then decreasing with the increase of GMA content, and reached a maximum value at the GMA content of 20%, with the values of which were 861.4 MPa and 780.9 MPa, respectively. The observation of the micro morphology of the composite showed that the resin and fiber were compact, and good impregnating effect was achieved.

Key words: photopolymerization, in situ polymerization, polyacrylate resin, thremoplastic prepreg