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首页> 外文期刊>Journal of Applied Polymer Science >Thioxanthone Sensitized Photodegradation of Poly(alkyl methacrylate) Films
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Thioxanthone Sensitized Photodegradation of Poly(alkyl methacrylate) Films

机译：噻吨酮敏化聚（甲基丙烯酸烷基酯）薄膜的光降解

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摘要

The thioxanthone-sensitized photodegradation of poly(alkyl methacrylate) films [alkyl = methyl, ethyl, butyl, and hexyl] was studied using near UV-vis light. The photooxidation process continued even after the total consumption of the sensitizer, possibly due to the excitation of the ketyl groups formed during the first stages of the process. The rate of oxidation, as well as the formation of hydroxy, peroxy, and ketyl groups was faster for polymers with larger ester groups. The decrease of the molecular weight of the degradated polymers was also larger for the hexyl substituted polymer. The side-chain size effect was attributed to the larger amount of secondary hydrogens available for abstraction by the triplet state of thioxanthone, present in the larger ester groups. The lower glass transition temperature of the hexyl substituted polymer allows a better diffusion of oxygen to the deeper layers of the films that also contributes to the faster photodegradation rate.
机译：使用近紫外可见光研究了聚（甲基丙烯酸烷基酯）薄膜[烷基=甲基，乙基，丁基和己基]的噻吨酮敏化的光降解。即使在敏化剂全部消耗之后，光氧化过程仍继续进行，这可能是由于在该过程的第一阶段中形成的酮基的激发所致。具有较大酯基的聚合物的氧化速率以及羟基，过氧和酮基的形成速度更快。对于己基取代的聚合物，降解的聚合物的分子量的降低也更大。侧链尺寸效应归因于存在于较大酯基中的噻吨酮的三重态可用于提取的大量次级氢。己基取代的聚合物的较低的玻璃化转变温度允许氧更好地扩散至膜的较深层，这也有助于更快的光降解速率。

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