Glass fiber reinforced thermoplastic composites have advantages,such as repeated molding,high toughness,high durability,designability,environmental friendliness and recyclability.To solve the problems of molding technology and durability of composites caused by high viscosity of polypropylene resin and high water absorption of nylon resin,this project adopted a molding process to develop and prepare glass fiber reinforced polypropylene/nylon hybrid composite sheets.The influence mechanism of hybrid modes on the mechanical and thermal properties of the sheets were studied,and the diffusion behavior of water molecules in the hybrid composite materials was compared and analyzed.Research has found that the sin-gle-layer interlaminar alternating hybrid mode sheet has the highest mechanical properties,with the maximum improvement rates of tensile,bending,and shear strength of 132.8％,127.4％,and 110.4％,which was attributed to the synergistic load-bearing effect of two prepreg tape of hybrid sheet under the interlayer bonding-extrusion effect,and the material properties were fully utilized.In contrast,the interlaminar alternating hybrid mode of the five-layer prepreg tape sheet has a significantly weak interface layer,which weakened the overall synergistic load-bearing effect of the sheet.In addition,due to the hydrophobicity of polypropylene resin and the alternating layer by layer hybrid mode,the absorption and diffusion behavior of water molecules inside the nylon resin were delayed or prevented,resulting in a significant decrease in the water absorption rate of the hybrid sheet,which was of great significance for improving the long-term durability of nylon resin based composites.
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