【摘要】 以煤沥青粉为填充剂,与氯醋/聚氨酯预聚体进行常温溶液共混,合成煤沥青粉填充的氯醋/聚氨酯复合材料.研究了不同软化点的煤沥青粉、煤沥青粉平均粒径和质量含量对复合材料力学性能、电性能的影响.通过扫描电镜(SEM)、热失重(TG)测试手段,分析了煤沥青粉的微观颗粒形态对氯醋树脂/聚氨酯复合材料的作用机理,讨论了复合材料的热稳定性.结果表明:质量含量为10%~15%的高温煤沥青粉可明显提高复合材料的力学、电绝缘性能;煤沥青粉粒径愈小,力学性能愈高;在煤沥青粒径为125μm时,电绝缘性最佳;该复合材料初始分解温度为190℃,终止温度约在610℃,具有良好的热稳定性;煤沥青粉的加入同时可起到黑色着色剂与光屏蔽作用.更多还原

【Abstract】 A coal-tar pitch/ poly(vinyl chloride-co-vinyl acetate,VC-co-VAC)/polyurethane(PU) composite was obtained by adding coal-tar pitch as filling agent to P(VC-co-VAC)/PU prepolymer.The influences of the kinds,amounts and particle sizes of coal-tar pitch on mechanical and dielectric properties of the composites were studied.Thermal stability was investigated with thermogravity technique(TG) under air.Using scanning electronic microscope(SEM),the granule pattern of coal-tar pitch was obtained and the machanism was discussed.The results show that when weight content of high temperature coal-tar pitch is 10%~15% can greatly improve mechanical properties of composites,and the smaller the coal-tar pitch particle size,the better the mechanical properties is.When coal-tar pitch partical size is 125 μm,dielectric properties is best.The initial decomposition temperature of composite is 190 ℃ and the termination temperature of composite is 610 ℃.The addition of coal-tar pitch has no effect on the thermal stability of composites,and coal-tar pitch also has ultra-violet light screening action.更多还原