Effect of the polymer type and experimental parameters on chemiluminescence curves of selected materials

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• 作者：Matisová ; -Rychlá ; Lyda ; Rychl&yacute ; Jozef ; Slová ; k ; Kristian
• 关键词：Chemiluminescence ; Thermal oxidation ; Degradation ; Polyolefins ; Polyamides ; Polysaccharides
• 刊名：Polymer Degradation and Stability
• 出版年：2003
• 期刊代码：85_01413910
• 类别：ms
• 出版时间：2003
• 卷：82
• 期：2
• 页码：173-180
• 文件大小：243 K

摘要

Oxidation of a series of common polymers and some low-molecular mass compounds has been examined by chemiluminescence. An oxidation test involving temperature ramp experiments in oxygen in the temperature range 40–220 °C has been used, enabling us to compare the oxidizability of different materials over a large temperature interval from the viewpoint of their chemiluminescence intensity and to discuss the observed discrepancies. According to this approach polymers can be divided into three groups. In the first, there are strongly luminescent polymers like polyolefins, polyamides, etc., in the second, medium luminescent polymers like cellulose, poly (2,6-dimethyl-1,4-phenylene oxide), etc., and in the third, weakly luminescent polymers like polystyrene, poly(methyl methacrylate), poly(ethylene terephthalate), etc. Different mechanisms of initiation may be seen in different temperature regions of polymer oxidation from the chemiluminescence intensity–temperature run depending on the polymer quality and on the physical state of the polymer matrix. The temperature coefficient of the chemiluminescence increase, as derived from the corresponding Arrhenius’ graphs is usually rather low below the T_g of the polymer (around 40–60 kJ/mol) while at high temperatures it reflects the oxidation of the polymer matrix (around 100–150 kJ/mol or more). Any previous oxidation of the polymer may affect the chemiluminescence intensity–temperature run significantly.