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首页> 外文期刊>Journal of Applied Polymer Science >THE STRUCTURAL CHANGES IN BUTYL AND HALOGENATED BUTYL ELASTOMERS DURING GAMMA IRRADIATION
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THE STRUCTURAL CHANGES IN BUTYL AND HALOGENATED BUTYL ELASTOMERS DURING GAMMA IRRADIATION

机译：γ射线辐照过程中丁基和卤代丁基弹性体的结构变化

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摘要

Ionizing radiation induces various changes in the molecular structure of elastomers; consequently, the macroscopic properties of the irradiated elastomers will be modified. The newly formed products and the alteration of the initial chemical structure are the result of free-radical reactions which provide the crosslinking and/or the depolymerization of the tested materials and destructive simultaneous processes involving diffused aggressive agents. This paper describes the behavior of butyl and chlorinated and brominated butyl elastomers under the action of gamma radiation for total doses up to 0.5 MGy. The experimental data provided by several procedures emphasize a complex chemistry circumstance consisting of the simultaneous crosslinking and scission of the macromolecular chains and consecutive processes involving free radicals. Evaluation of the studied changes was via gel content, oxidation level, unsaturation, and halogen distribution as dependent on the total radiation dose. The mechanism of the degradation and a relationship between the crosslinking/scission ratio and the absorbed dose are discussed. (C) 1996 John Wiley & Sons, Inc. [References: 20]
机译：电离辐射会引起弹性体分子结构的各种变化。因此，辐照弹性体的宏观性能将得到改善。新形成的产物和初始化学结构的改变是自由基反应的结果，该自由基反应提供了被测材料的交联和/或解聚以及涉及扩散的侵蚀剂的破坏性同时过程。本文描述了在总剂量不超过0.5 MGy的γ射线作用下，丁基橡胶以及氯化和溴化丁基橡胶的行为。由几种方法提供的实验数据强调了复杂的化学环境，包括同时交联和分裂大分子链以及涉及自由基的连续过程。通过凝胶含量，氧化水平，不饱和度和卤素分布（取决于总辐射剂量）评估研究的变化。讨论了降解机理以及交联/断裂比与吸收剂量之间的关系。 （C）1996 John Wiley＆Sons，Inc. [参考：20]

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