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聚丙烯酸甲酯及其模型化合物２－甲基丁酸甲酯与Ｏ２能够形成不稳定的接触电荷转移复合物（ＣＣＴ）。在无光照条件下，通Ｏ２放置一段时间以后再通Ｎ２，ＣＣＴ吸收峰不再完全消失，其残留峰的强度随存放时间的延长、温度的升高而增加，峰形和峰位与原ＣＣＴ相似。通过对２－甲基丁酸甲酯氧化产物的分析，证明过氧化反应发生在α－Ｈ位置，并有２－甲基丁烯酸甲酯生成。
Poly (methyl acrylate) and its model compound methyl 2-methylbutyrate and O2 can form unstable contact charge transfer complex (CCT). Under the condition of no light, the absorption peak of CCT no longer disappears completely after O2 is placed for some time, and the intensity of its residual peak increases with the extension of storage temperature and the peak of CCT similar. By analyzing the oxidation products of methyl 2-methylbutyrate, it was proved that the peroxidation occurred at the α-H position and methyl 2-methyl crotonate was formed.