甲基丙烯酸酯
共聚物
丙烯酸酯
高分子化学
聚合物
材料科学
甲基丙烯酸
傅里叶变换红外光谱
化学
化学工程
有机化学
工程类
作者
Massimo Lazzari,Oscar Chiantore,Valter Castelvetro
摘要
Abstract Copolymers of 2,2,2‐trifluoroethyl methacrylate, or 1H,1H,2H,2H‐perfluorodecyl acrylate (XFDA) and butyl methacrylate (BMA) have been irradiated in air under artificial solar light and their photo‐oxidative stability has been investigated. Molecular and chemical changes occurring during the treatments have been monitored by weight loss and gel content determination, size exclusion chromatography and FTIR spectroscopy. It has been determined that the overall behaviour of both copolymers is controlled by the BMA units, independently of the total fluorine content. The photo‐ageing takes place mainly via the mechanism of oxidation of methacrylic polymers containing long side ester groups, whose flexibility favours macroradical coupling reactions. The tendency to crosslink is balanced only in the case of the initial stages of degradation of XFDA/BMA by the scission reactions derived from the direct attack of oxygen on the fluorinated acrylic units. © 2001 Society of Chemical Industry
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