硅炔杂化树脂及其复合材料的制备与性能研究OA

Silane hybrid resin,as a kind with excellent temperature resistance material,is favored in lots of fields.This investigation has studied the performance and characteristic of one kind of high-performance silane hybrid resins modified by chemical and physical methods and made it into composites for promoting the application of this material.This study investigates the relationship between structure and performance aiming to improve this resin's heat resistance,mechanical properties and processing performance.In this study,m-diethynylbenzenes and dichlorosilane with different substituents were used to make poly(m-diethynylbenzene-silane)resin(PBS-R).The structure,curing process and heat resistance of the PBS-R resins was researched by various test methods.The results showed that viscosity of PBS-R increased with increasing of molecular weight;curing temperature rose with the enlargement of the steric hin-drance of the silane substituents.The resin PBS-H which synthesied from methylhydrodichlorosilane has the best heat resistance.Td5 reached 734.8℃and 615.2℃,respectively at N2 and air atmosphere.Poly(m-diethynylbenzene-dimethylsilane)resin(PBS-B)has the optimum mechanical properties.By reinforcing with glass fiber,the flexural and interlaminar shear strength of composites at room temperature reached 403.5 MPa and 21.3 MPa,with perform-ance retention rates above 80%at 250℃testing environment.