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IR spectroscopy study of polypropylene natural aging

机译：聚丙烯自然老化的红外光谱研究

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Structural modifications of a commercial polypropylene (PP) sample are studied by IR spectroscopy. Aging this sample under an ambient atmosphere with or without the presence of ambient light shows the oxidation process to be the most predominant. Spectral analysis reveals that the commercial sample is isotactic and also indicates that, for the new sample, oxygen establishes single bonds with carbon. However, through the aging process, spectral changes essentially occur in the regions of similar to 3400, similar to 1712, and 1170 cm(-1) which correspond to hydroxyl and/or hydroperoxide groups, a carbonyl group, and C-O, respectively. The deconvolution of the bands corresponding to a carbonyl group reveals the presence of a complicated mixture of oxidation products: aldehydes, ketones, esters, acids, peresters, and peracids. Spectral analysis also shows that the most favorable site for oxidation is at the methylene group. (C) 2000 John Wiley & Sons, Inc. [References: 20]
机译：通过红外光谱研究了商用聚丙烯（PP）样品的结构改性。在有或没有环境光的环境气氛下老化该样品表明，氧化过程是最主要的。光谱分析表明商业样品是全同立构的，并且还表明，对于新样品，氧与碳建立单键。但是，通过老化过程，光谱变化基本上发生在类似于3400，类似于1712和1170 cm（-1）的区域，分别对应于羟基和/或氢过氧化物基团，羰基和C-O。对应于羰基的条带的反卷积揭示了氧化产物的复杂混合物的存在：醛，酮，酯，酸，过酸酯和过酸。光谱分析还表明，最优选的氧化位在亚甲基上。 （C）2000 John Wiley＆Sons，Inc. [参考：20]

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