研究了低密度聚乙烯(LDPE)DSC原位加速热老化特性，分析了热老化温度对 LDPE 熔融特性和微观结构的影响，通过主成分分析法(PCA)和指数函数拟合方法探究了参数变化间的相关关系，建立并评估了 LDPE在热老化条件下的老化综合评价指标。结果表明，在较低热老化温度条件下，支化和断链作用占主导，随着老化温度的升高，氧化作用逐渐加强，氧化产物生成增多，乙烯基、支化程度、断链程度、羰基指数和羟基指数协同相关且相关程度高，起始点温度与峰值温度、终止点温度相关程度弱，峰值温度对乙烯基、支化程度和羰基指数的指数相关性最好，老化综合评价指标显现老化整体趋势和速率呈现两段式变化。
In this article,the ageing properties of low density polyethylene(LDPE)by in-situ accelerated thermal aging were studied based on DSC.The effect of thermal aging temperature on melting characteristic and micro-structure were studied.The relationship between factors was explored by principal components analysis (PCA) and function fitting and the combined evaluating parameter of LDPE under different thermal aging temperature was established and analyzed.The results showed that the branching degree and chain scission are predominant under low thermal aging temperature,and the oxidation is aggravated and oxidation products are increased with temperature increasing.Vinyl,branching degree,chain scission,carbonyl index and hydroxyl index are strongly correlated,and onset temperature is weekly correlated with peak and end temperature.The peak temperature is greatly correlated with vinyl,branching degree and carbonyl index.And the combined evaluating parameter characteristics indicated two-stage changes trend.
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