叙述了PVC材料的应用以及回收再利用的方式,强调了再生利用之前进行分子结构表征及品质鉴定的必要性。结合PVC老化降解的微观机理,重点论述了分子结构表征的三个方面:共轭双键及羰基的含量、氯含量、分子量及其分布的变化。所涉及到的表征方法主要有:FTIR、UV、XPS、GPC、DSC。 Describes the application of PVC materials and recycling methods, emphasizing the need for molecular structure characterization and quality identification before recycling. Combined with the microcosmic mechanism of degradation and degradation of PVC, the three aspects of the molecular structure characterization are discussed emphatically: the content of conjugated double bond and carbonyl, the content of chlorine, the molecular weight and the distribution of the changes. The main characterization methods involved are: FTIR, UV, XPS, GPC, DSC.