超临界CO2技术对空心/实心石英混编纤维表面改性

采用热处理+溶剂浸洗+超临界CO2技术对空心/实心石英混编纤维表面进行预处理,同时利用超临界流体的携带与渗透作用,将KH-560偶联剂引入纤维表面进行改性。采用接触角测试、表/界面张力测试、树脂吸附量测试、力学性能测试、扫描电镜等分别测试纤维表面能、胶液表面张力与接触角、胶液与纤维浸润性,观察纤维表面形貌结构,分析复合材料的力学与介电性能。结果表明:采用热处理+溶剂浸洗+超临界CO2技术可有效去除空心/实心石英混编纤维表面浸润剂,提高纤维表面能,促进胶液与纤维的完全浸润,最终改善复合材料力学与介电性能。

Supercritical carbon dioxide for surface treatment of hollow/solid hybrid quartz fiber

The penetration and carrying ability of supercritical carbon dioxide were used to eliminate fibers’ agent and carry coupling agent(KH-560) into fiber to modify the hollow/solid hybrid quartz fibrics. The surface energy and interfacial tension of modified fiber and the adsorption with resin were measured. The surface morphology of fibers was observed. The results showed that most of the fibers’ agent was removed in the Heat treatment+Solvent bathing+Supercritical carbon dioxide treatment process.The surface energy of fibers was increased, and this indicates that the hybrid quartz fibrics could be impregnated much better by modified cyanate resin. All indicated that the treatment process can improve the mechanical and dielectric properties of composite materials.