研究了聚氯乙烯(PVC)在应力作用下的紫外光老化行为.老化后的样品采用超薄切片法,应用红外和紫外光谱分析手段,从微观角度研究了应力对PVC各层化学结构变化的影响;同时对样品的凝胶含量和表面形貌等进行了表征,探讨了应力作用下PvC的紫外光老化机理.结果表明:应力使PVC的氧化层增厚,共轭双键层变薄;应力的存在会大大加速氧化反应,但却降低了共轭双键的生成量.
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