无卤阻燃增强聚碳酸酯寿命评价研究

Study on Lifetime Evaluation of Halogen-free Flame-retardant Glass-fiber Reinforced Polycarbonate

以无卤阻燃玻璃纤维增强聚碳酸酯材料为研究对象,通过研究材料在不同老化温度下拉伸强度保持率的变化规律,基于阿累尼乌斯公式算得材料的活化能及在一定工作温度下材料的服役稳定性。结合对比分别在聚碳酸酯树脂的玻璃化转变温度(T_(g))上下的两个老化温度环境下样条表面的形貌差异,结合拉伸强度性能保持率的对比可知,随着热氧老化的进行,玻璃纤维和树脂之间逐渐发生剥离,性能保持率逐渐下降,当在高于树脂的T_(g)(170℃),由于分子链的活动能力大幅度提高,材料形变进一步加速玻璃纤维与树脂之间的剥离,性能衰减远明显于低于树脂T_(g)(140℃)。

Taking flame retardant glass fiber reinforced polycarbonate as study objective,the tensile strength retention rate of materials at different aging temperatures and the service stability of materials at working temperature were studied,and the activation energy(Ea)was calculated by Arrhenius formula.By comparing the morphology difference of tensile strength bars surface at two aging temperatures separately above and below the glass transition temperature(T_(g))temperature of polycarbonate(PC)resin,with the comparison of tensile strength retention,it could be seen that during thermal oxygen aging,peeling gradually occurs between glass fiber and resin,then tensile strength retention gradually decreases.When it is higher than the T_(g) temperature of 170℃,PC chain activity is greatly improved to increase the crack between the resin and the glass-fibre,which shows much less properties than the temperature below T_(g),which is 140℃.