乙丙共混物的热氧老化过程是一个复杂的过程，对于材料的应用有重要的影响。本文首先制备乙丙共混物，并对其进行了表征；通过逐步老化和快速老化2种老化方式研究共混物的变化规律和影响因素。结果表明，1）逐步老化过程首先产生羰基类化合物，生成的羰基化合物再进一步氧化转化为醚类；2）快速升温老化，聚合物容易分解成小分子挥发而产生较少积炭；而逐步升温老化，聚合物在缓慢分解同时可能继续交联碳化而产生较多积炭；3）乙丙共混物的老化变黑主要是由PE产生。%The thermal aging process of PE/PP blends is very complicated, which affects the use performance of material deeply. The PE/PP blends were prepared and then characterized by FT-IR spectra, at first. Secondly, their thermal oxidative aging processes and related influencing factors were discussed by using two aging methods—gradual aging and accelerated aging. The main results are as follows: 1.the carbonyl compounds are produced and then get further oxidized to ethers during the gradual aging process; 2. the polymers easily decomposed into the small molecular volatiles and produce a little carbon deposit during the accelerated aging, while during the gradual aging process the slow decomposition and crosslinking-carbonization reactions for the polymers might occur simultaneously, so the amount of produced carbon deposit is more; 3.the aging-blackening of the PE/PP blends is caused by the aging products of PE.
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