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Self-healing and reprocessable bromo butylrubber based on combined ionic cluster formation and hydrogen bonding
Polymer Chemistry ( IF 4.1 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9py01630a Sebastian Stein 1, 2, 3, 4, 5 , Anton Mordvinkin 3, 6, 7, 8 , Brigitte Voit 1, 2, 3, 4, 5 , Hartmut Komber 1, 2, 3 , Kay Saalwächter 3, 6, 7, 8 , Frank Böhme 1, 2, 3
Polymer Chemistry ( IF 4.1 ) Pub Date : 2019/12/19 , DOI: 10.1039/c9py01630a Sebastian Stein 1, 2, 3, 4, 5 , Anton Mordvinkin 3, 6, 7, 8 , Brigitte Voit 1, 2, 3, 4, 5 , Hartmut Komber 1, 2, 3 , Kay Saalwächter 3, 6, 7, 8 , Frank Böhme 1, 2, 3
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Self-healing rubber mixtures are described, the cross-linking of which is based on both ionic cluster formation and supramolecular association. For this, brominated poly(isobutylene-co-isoprene) rubber (BIIR) was converted with modifiers which contained one uracil and one imidazole moiety. The reaction with the imidazole moiety resulted in the formation of ionic groups which associated to ionic clusters. Additionally, supramolecular association of the uracil groups with a bifunctional (bi-) linker containing two diamidopyridyl moieties contributed to physical cross-linking of the rubber via triple hydrogen bonding. Mechanical properties including self-healing of the rubber mixtures are discussed in terms of competing interactions and a softening effect caused by the bi-linker. The results are supported by DMA measurements and low-field multiple-quantum (MQ) NMR experiments which delivered information about the macroscopic properties and the underlying molecular dynamics, respectively. The reversible nature of the network formation and the softening effect of the bifunctional linker enable multiple reprocessing without sacrificing mechanical performance, which is an important feature that distinguishes the rubber mixtures significantly from covalently cross-linked rubbers.
中文翻译：
基于离子簇形成和氢键结合的自修复和可再加工溴丁基橡胶
描述了自修复橡胶混合物，其交联基于离子簇的形成和超分子缔合。为此，用含有一个尿嘧啶和一个咪唑部分的改性剂将溴化聚（异丁烯-共-异戊二烯）橡胶（BIIR）转化。与咪唑部分的反应导致形成与离子簇相关的离子基团。另外，尿嘧啶基团与包含两个二酰胺基吡啶基部分的双功能（双）接头的超分子缔合有助于橡胶通过三氢键。根据竞争性相互作用和由双接头引起的软化作用，讨论了包括橡胶混合物自我修复在内的机械性能。DMA测量和低场多量子（MQ）NMR实验支持了这些结果，这些实验分别提供了有关宏观性质和潜在分子动力学的信息。网络形成的可逆性质和双功能连接基的软化作用可实现多次再加工而不会牺牲机械性能，这是一个重要的特征，可将橡胶混合物与共价交联的橡胶区别开来。
更新日期：2020-02-13
中文翻译：
基于离子簇形成和氢键结合的自修复和可再加工溴丁基橡胶
描述了自修复橡胶混合物，其交联基于离子簇的形成和超分子缔合。为此，用含有一个尿嘧啶和一个咪唑部分的改性剂将溴化聚（异丁烯-共-异戊二烯）橡胶（BIIR）转化。与咪唑部分的反应导致形成与离子簇相关的离子基团。另外，尿嘧啶基团与包含两个二酰胺基吡啶基部分的双功能（双）接头的超分子缔合有助于橡胶通过三氢键。根据竞争性相互作用和由双接头引起的软化作用，讨论了包括橡胶混合物自我修复在内的机械性能。DMA测量和低场多量子（MQ）NMR实验支持了这些结果，这些实验分别提供了有关宏观性质和潜在分子动力学的信息。网络形成的可逆性质和双功能连接基的软化作用可实现多次再加工而不会牺牲机械性能，这是一个重要的特征，可将橡胶混合物与共价交联的橡胶区别开来。
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