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首页> 外文期刊>RSC Advances >Viscoelastic and self-healing behavior of silica filled ionically modified poly(isobutylene-co-isoprene) rubber
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Viscoelastic and self-healing behavior of silica filled ionically modified poly(isobutylene-co-isoprene) rubber

机译：二氧化硅填充的离子改性聚异丁烯-异戊二烯橡胶的粘弹性和自修复性能

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Rubber composites were prepared by mixing bromobutyl rubber ( BIIR ) with silica particles in the presence of 1-butylimidazole. In addition to pristine (precipitated) silica, silanized particles with aliphatic or imidazolium functional groups, respectively, were used as filler. The silanization was carried out either separately or in situ during compounding. The silanized particles were characterized by TGA, ~(1) H– ~(29) Si cross polarization (CP)/MAS NMR, and Zeta potential measurements. During compounding, the bromine groups of BIIR were converted with 1-butylimidazole to ionic imidazolium groups which formed a dynamic network by ionic association. Based on DMA temperature and strain sweep measurements as well as cyclic tensile tests and stress–strain measurements it could be concluded that interactions between the ionic groups and interactions with the functional groups of the silica particles strongly influence the mechanical and viscoelastic behavior of the composites. A particularly pronounced reinforcing effect was observed for the composite with pristine silica, which was attributed to acid–base interactions between the silanol and imidazolium groups. In composites with alkyl or imidazolium functionalized silica particles, the interactions between the filler and the rubber matrix form dynamic networks with pronounced self-healing behavior and excellent tensile strength values of up to 19 MPa. This new approach in utilizing filler–matrix interactions in the formation of dynamic networks opens up new avenues in designing new kinds of particle-reinforced self-healing elastomeric materials with high technological relevance.
机译：通过在1-丁基咪唑存在下将溴化丁基橡胶（BIIR）与二氧化硅颗粒混合来制备橡胶复合材料。除原始的（沉淀的）二氧化硅外，分别使用具有脂肪族或咪唑族官能团的硅烷化颗粒作为填料。硅烷化可以在混合过程中单独进行或就地进行。硅烷化的粒子通过TGA，〜（1）H〜〜（29）Si交叉极化（CP）/ MAS NMR和Zeta电位测量进行表征。在混合过程中，BIIR的溴基团被1-丁基咪唑转化为离子咪唑鎓基团，该离子咪唑鎓基团通过离子缔合形成了动态网络。基于DMA温度和应变扫描测量以及循环拉伸测试和应力应变测量，可以得出结论，离子基团之间的相互作用以及与二氧化硅颗粒官能团的相互作用强烈地影响了复合材料的机械和粘弹性行为。对于具有原始二氧化硅的复合材料，观察到特别明显的增强作用，这归因于硅烷醇和咪唑鎓基团之间的酸碱相互作用。在具有烷基或咪唑鎓官能化二氧化硅颗粒的复合材料中，填料与橡胶基体之间的相互作用形成动态网络，具有明显的自愈性能和高达19 MPa的优异拉伸强度值。这种利用填料-基体相互作用形成动态网络的新方法为设计具有高技术相关性的新型颗粒增强自修复弹性体材料开辟了新途径。

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