纳米增强竹浆纤维/环氧树脂复合材料的热解动力学

摘要

采用纳米碳酸钙(CaCO3)浸渍改性工艺对竹浆纤维(BPF)进行改性,并采用真空辅助树脂浸注(VARI)技术制备纳米浸渍改性竹浆纤维(IMBPF)/环氧树脂复合材料.利用热失重分析(TGA)方法研究了原材料和复合材料在氮气气氛下的热降解行为,采用Flynn-Wall-Ozawa(FWO)和Vyazovkin and Weight(VW)方法量化了复合材料的表观活化能.结果表明:IMBPF/环氧树脂复合材料出现300～400,400～450,600～700℃3个失重区,分别对应BPF、环氧树脂和纳米CaCO3的热降解;采用FWO法和VW法测定的IMBPF/环氧树脂复合材料的表观活化能均高于对照样(未改性的BRF),且FWO法估算数值高于VW法;纳米CaCO3对复合材料的热降解特性具有调控作用;FWO法和VW法处理的结果总体相差不大,但前者优于后者.%Bamboo pulp fiber (BPF) was treated by nano CaCO3 impregnation modification(IM),and IMBPF/epoxy resin composites was prepared by means of vaeumm-assisted resin infusion(VARI)technology.Thermal degradation behavior of raw materials and composites was studied by thermo-gravimetric method(TGA) under nitrogen atmosphere.Also,the apparent activation energy of the composite was quantified by Flynn-Wall-Ozawa(FWO) and Vyazovkin and Weight(VW) model.It turned out that IMBPF/epoxy resin composites have three weight loss stages at the temperature ranges:300-400,400-450 and 600-700 ℃,due to thermal decomposition of BPF,epoxy resin and nano CaCO2,respectively.The average activation energy of IMBPF/epoxy resin composites determined by two methods was higher than that of the control sample,and the value estimated by FWO method was higher than that by VW method.Nano CaCO3 has a regulatory effect on thermal degradation characteristics of composite.Meanwhile,there is only little difference between two methods which could provide theoretical support for the efficient utilization of plant fiber reinforced polymer composites.