环氧树脂/石英纤维透波复合材料制备

为改善环氧树脂的介电性能及提升石英纤维的界面性能,使用缩水甘油醚基笼型倍半硅氧烷(G–POSS)和γ–氨丙基三乙氧基硅烷(KH–550)分别对环氧树脂和石英纤维进行改性。利用差示扫描量热法研究改性后环氧树脂的固化过程,并通过外推法确定了其固化工艺,根据固化工艺制备环氧树脂/石英纤维复合材料,分别对该复合材料的热稳定性、介电性能和弯曲性能进行表征,结果表明,使用G–POSS和KH–550改性后的环氧树脂/石英纤维复合材料热稳定性、介电性能和弯曲性能达到最佳,初始分解温度达到369.59℃,常温下在12~18 GHz的介电常数稳定在3.2~3.5之间,介电损耗角正切值在0.005~0.02之间,弯曲强度达到376.4 MPa,弯曲弹性模量为21.7 GPa。

Preparation of Epoxy Resin/Quartz Fiber Wave-transparent Composites

Glycidyl polyhedral oligomeric silsesquioxane(G–POSS)andγ-aminopropyl triethoxy silane coupling agent(KH–550)were used to enhance the dielectric properties of the epoxy resin and improve the interfacial properties of the quartz fiber,respectively.The curing process of the modified epoxy resin system was studied by differential scanning calorimetry,and the curing procedure of the epoxy resin was determined by extrapolation.The epoxy/quartz fiber composites were prepared,the thermal properties,dielectric properties and bending properties of composites were tested.The results show that the modified epoxy/quartz fiber composites achieve the best performance.The degradation temperature of composites reachs 369.59℃,the dielectric constant is 3.2–3.5 in 12–18 GHz at room temperature and the tangent value of dielectric loss angle is 0.005–0.02,the flexural strength reachs 376.4 MPa and the flexural modulus of elasticity is 21.73 GPa.