中文摘要：

采用超临界正丁醇在KOH作用下从碳纤维/环氧树脂（CF/EP）复合材料中回收高性能CF。分析了反应温度和反应时间对CF/EP复合材料中EP降解率的影响,研究了回收CF增强聚丙烯（PP）复合材料的力学性能;分析了降解液相产物组分,研究了EP固化体系在超临界正丁醇中的催化降解历程,建立了降解动力学模型,通过解算动力学参数建立了催化降解动力学方程。结果表明：反应温度和反应时间与EP的降解率呈明显的正相关性;与原CF增强PP复合材料相比,回收CF增强PP复合材料的拉伸强度下降9.2%,弯曲强度下降20.9%,弯曲模量下降10.9%,冲击强度下降7.4%;CF/EP复合材料降解反应主要为EP固化体系分子链段中C—C、—O—等线性链段的断裂以及交联部位C—N的断裂;CF/EP复合材料催化降解的反应级数为2,反应活化能为165.2kJ·mol-1,指前因子为3.62×1013 min-1,建立的动力学方程可解决反应温度和反应时间不可预估的问题。

英文摘要：

The high performance carbon fiber（CF）can be recycled from CF/epoxy resin（CF/EP）composites by supercritical n-butanol under the action of KOH.Influences of reaction temperature and reaction time on degradation rate of EP in CF/EP composites were analyzed,and mechanical properties of the recycled CF reinforced polypropylene（PP）composites were investigated.Catalytic degradation process of the EP curing system in supercritical n-butanol was investigated based on analysis for components of degradation liquid phase products,and the degradation kinetics model was established.The catalytic degradation kinetics equation was proposed based on the calculation of the kinetics parameters.The results indicate that reaction temperature and reaction time show obvious positive correlation to degradation rate of EP.In comparison with the original CF reinforced PP composites,the tensile strength of the recycled CF reinforced PP composites decreases by 9.2%,the bending strength decreases by 20.9%,the bending modulus decreases by 10.9%,and the impact strength decreases by 7.4%.Degradation reactions of CF/EP composites are mainly the scission of linear chains such as C—C,—O—,etc.and the scission of C—N at the crosslinked segment in the molecule segment of EP curing system,and catalytic degradation reaction order of CF/EP composites is 2,reaction activation energy is 165.2kJ·mol-1,pre-exponential factor is 3.62×1013 min-1,and the established kinetics equation can solve the problem that the reaction temperature and reaction time can not be estimated.