Thermal decomposition of poly(styrene) in the presence of a hydrogen atom transfer agent
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- 作者：Simone T. Lazar ; Bob A. Howell…
- 关键词：Poly(styrene) degradation ; Radical ; trapping ; Head ; to ; head linkage ; Thermal stabilization ; Antioxidant ; Macroradical decomposition
- 刊名：Journal of Thermal Analysis and Calorimetry
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：127
- 期：1
- 页码：969-974
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Physical Chemistry; Analytical Chemistry; Polymer Sciences; Inorganic Chemistry; Measurement Science and Instrumentation;
- 出版者：Springer Netherlands
- ISSN：1588-2926
- 卷排序：127
文摘
General-purpose poly(styrene) is conventionally prepared using radical techniques in which termination of polymerization occurs through radical coupling to form a head-to-head unit. Previous evidence has shown that the bond linking the head-to-head components can undergo homolysis under thermal stress. Styrene monomer is generated from the rapid depolymerization of the macroradicals generated to release styrene monomer. Poly(styrene) containing no head-to-head units, on the other hand, does not undergo similar decomposition. Furthermore, the presence of polymer additives such as a hydrogen transfer agent that can effectively trap the macroradicals generated by chain scission should inhibit chain unzipping to form monomer. A direct comparison of the stability of the polymer in the presence and absence of a hydrogen atom transfer agent is readily available by thermogravimetric techniques.