石英纤维增强含硅芳炔树脂复合材料的界面增强

Interfacial Strengthening of Quartz Fabrics Reinforced Silicon-containing Arylacetylene Composites

制备苯乙炔全封端的含硅芳炔树脂,与含硅芳炔树脂(PSA)共混,得到满足RTM成型工艺要求的低黏度含硅芳炔树脂,合成三乙氧基乙炔基硅烷(TEOAS)并应用于改性石英纤维(QF)布,采用RTM工艺制备石英纤维增强的PSA树脂复合材料。对共混树脂的加工工艺性、耐热性能、石英纤维的表面和复合材料的性能进行研究。结果表明:共混PSA树脂不但具备较高的耐热性,而且有良好的加工工艺性能;X射线光电子能谱(XPS)分析表明QF表面接枝上乙炔基,TEOAS处理后QF与共混PSA树脂的界面黏结强度增强,复合材料的弯曲强度和层间剪切强度(ILSS)分别较未处理时提高了28.8%和25.4%。

Fully end-capped silicon-containing arylacetylene（FEC-PSA）terminated with phenylacetylene was prepared in terms of Grignard route.A low viscosity PSA resin for resin-transfer molding（RTM）process was prepared by blending FEC-PSA and PSA.A silane coupling agent triethoxy（acetenyl）silane（TEOAS）was synthesized as a quartz fiber（QF）surface modifier.RTM process was used to fabricate the quartz fabrics reinforced blended PSA composites.The processing performance and thermal properties of the blended PSA,surface of the quartz fibers and the mechanical properties of the composites were investigated.The results show that the blended PSA resin has not only highly heat-resistance,but also good processing performance.XPS analyses indicate that the surface of QF is grafted by ethynyl groups.The interfacial strength between the surface of QF treated by TEOAS and the blended PSA resin is improved.The flexural strength and interlayer shear strength（ILSS）of the interfacial strengthening composites are increased by 28.8% and 25.4%,respectively,compared to the pristine composite without TEOAS-treated QF.