Photooxidative degradation of acrylic and methacrylic polymers
Photooxidative degradation of acrylic and methacrylic polymers
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DOI：
10.1016/s0032-3861(99)00349-3
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发表时间：
2000-03-01
期刊：
影响因子：
4.6
通讯作者：
Lazzari, M
中科院分区：
文献类型：
--
作者：
Chiantore, O;Trossarelli, L;Lazzari, M
研究了聚丙烯酸甲酯、聚丙烯酸乙酯、聚甲基丙烯酸乙酯和聚甲基丙烯酸丁酯在人工日光照射下的光氧化稳定性。分子和化学变化引起的光处理，其次是尺寸排阻色谱和傅立叶变换红外光谱。丙烯酸酯单元被发现是更积极的氧化，与甲基丙烯酸酯相比。在丙烯酸酯和甲基丙烯酸酯样品中，具有短烷基侧基的链断裂优于交联反应。聚（甲基丙烯酸丁酯）的降解以完全不同的方式进行，具有广泛的交联和同时的断裂反应。在所有样品中，由于氧化反应而形成的结构是相似的。同时还发现，降解的第一个效应是与样品分子量分布的变化有关的。(C)1999爱思唯尔科技有限公司。保留所有权利。
The photooxidative stability of poly(methyl acrylate), poly(ethyl acrylate), poly(ethyl methacrylate) and poly(butyl methacrylate) has been investigated under conditions of artificial solar light irradiation. Molecular and chemical changes induced by the light treatment were followed by size exclusion chromatography and Fourier transform infrared spectroscopy. The acrylate units were found to be more reactive towards oxidation, in comparison with the methacrylate ones. With short alkyl side groups chain scissions prevailed over cross-linking reactions both in acrylate and methacrylate samples. The degradation of poly(butyl methacrylate) proceeds in a completely different way, with extensive cross-linking and simultaneous fragmentation reactions. In all the samples the structure formed as result of oxidation reactions were similar. It has also been found that the first effect of degradation to be detected is that connected with the changes of samples molecular weight distributions. (C) 1999 Elsevier Science Ltd. All rights reserved.