The focus of this work is on the nature of self-healing of ionically modified rubbers obtained by reaction of brominated poly(isobutylene-co-isoprene) rubber (BIIR) with various alkylimidazoles such as 1-methylimidazole, 1-butylimidazole, 1-hexylimidazole, 1-nonylimidazole, and 1-(6-chlorohexyl)-1H-imidazole. Based on stress–strain and temperature dependent DMA measurements, a structural influence of the introduced ionic imidazolium moieties on the formation of ionic clusters and, as a consequence, on the mechanical strength and self-healing behavior of the samples could be evidenced. These results are fully supported by a molecular-level assessment of the network structure (cross-link and constraint density) and the dynamics of the ionic clusters using an advanced proton low-field NMR technique. The results show distinct correlations between the macroscopic behavior and molecular chain dynamics of the modified rubbers. In particular, it is shown that the optimization of material properties with regard to mechanical and self-healing behavior is limited by opposing tendencies. Samples with reduced chain dynamics exhibit superior mechanical behavior but lack on self-healing behavior. In spite of these limitations, the overall performance of some of our samples including self-healing behavior exceeds distinctly that of other self-healing rubbers described in the literature so far.

中文翻译：

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调节离子改性聚异丁烯-共-异戊二烯橡胶的性能和自愈性能

这项工作的重点是通过溴化聚（异丁烯-共异戊二烯）橡胶（BIIR）与各种烷基咪唑（例如1-甲基咪唑，1-丁基咪唑，1-己咪唑）反应制得的离子改性橡胶的自愈性质。，1-壬基咪唑和1-（6-氯己基）-1 H-咪唑。基于应力-应变和温度相关的DMA测量，可以证明引入的离子咪唑部分对离子簇的形成以及结果对样品的机械强度和自我修复行为的结构影响。使用先进的质子低场NMR技术对网络结构（交联和约束密度）以及离子簇的动力学进行分子水平的评估，充分支持了这些结果。结果表明，改性橡胶的宏观行为与分子链动力学之间存在明显的相关性。特别地，显示出关于机械性能和自愈性能的材料性能的优化受到相反趋势的限制。链动力学降低的样品表现出优异的机械性能，但缺乏自我修复性能。尽管存在这些限制，但到目前为止，我们某些样品的整体性能（包括自修复性能）明显超过了文献中描述的其他自修复橡胶的性能。