A benzoxazine hybrid resin(BZ-H) was prepared by thermal prepolymerization between benzoxazine
(BZ) and polysilazane to enhance thermal stability of benzoxazine resin, and glass fiber cloth/ hybrid resin composite
was also obtained by molding process. The resin shows a low viscosity between 70℃ to 170℃, indicating that the resin
possesses suitable viscosity to fabricate composites. DSC results show the hybrid resin can be cured at lower temperature.
Dynamic mechanical analysis(DMA) shows the inflection point of tanδ is 354. 7℃. In nitrogen,5% weight loss
temperature of the final cured products is 460℃, and char yield is 75. 68% at 900℃. In air, 5% weight loss temperature
of the final cured products is 466℃,and char yield is 16. 39% at 900℃. Results of mechanical property showed
that flexural strength,flexural modulus and interlaminar shear strength of the composite is 433 MPa,22 GPa and 24
MPa,respectively. At 350℃, the retention rate of flexural strength, flexural modulus and interlaminar shear strength
for the composite is 40%,68% and 54%. SEM image showed strong cohesiveness between benzoxazine and glass fiber,
which endowed the composites excellent mechanical properties.