Self-healing elastomers based on bromobutyl rubber with reversible interacting groups

该项目的目的是实现自修复原理的溴丁基橡胶（BIIR）是一种具有高度实用价值的材料。除了利用氢键形成改性剂外，还打算利用由聚离子液体（PIL）产生的离子相互作用，在材料损伤过程中形成小裂纹的情况下，它们被认为是分子胶。它打算采用三种不同的方法。第一个是BIIR与PIL共混物的制备。在这里，它旨在防止组分之间的任何化学反应，以保持PIL相的完全迁移性。在第二种方法中，将BIIR与PIL进行嫁接。在这种情况下，由于PIL链的一侧固定在BIIR主链上，PIL相的移动性略有受限。最终，我们打算用一种双功能交联剂来交联BIIR，这种交联剂能够形成可逆的氢键。在每种情况下，BIIR的活性溴基团将有助于定制BIIR以实现其最佳利用。通过这种方法，将得到三种不同类型的超分子弹性体，其缔合组分的迁移率是渐变的。这样就可以比较研究链迁移率、关联效应和相互作用的可逆性对自愈效应的影响。为此，拟对切割后的样品进行修补试验。应力-应变测试将提供有关应变引起的愈合效果的信息。DMA测量旨在研究可逆离子簇的形成。最后，裂纹扩展研究将阐明在多大程度上可逆相互作用可能有助于弹性体材料的自愈。

The aim of this project is the implementation of self-healing principles to bromobutyl rubber (BIIR) which is a material of high practical importance. Apart from the utilization of hydrogen bond forming modifiers, it is intended to use ionic interactions originated by poly(ionic liquid)s (PIL), which are assumed to act as molecular glue in the case of small cracks formed during material damage.It is intended to pursue three different approaches. The first one concerns the preparation of blends of BIIR with PIL. Here, it is aimed to prevent any kind of chemical reactions between the components in order to keep complete mobility of the PIL phase. In the second approach grafting of BIIR with a PIL is intended. In this case, the mobility of the PIL phase is slightly constrained due to the fixation of one side of the PIL chain to the BIIR backbone. Eventually, it is intended to cross-link BIIR by a bifunctional cross-linker which is able to form reversible hydrogen bonds. In each case the reactive bromine groups of BIIR will help to tailor BIIR for its optimal utilization.In this way, three different types of supramolecular elastomers will be obtained with graduated mobility of the associating component. This allows comparative investigations to the influence of chain mobility, associating effects, and reversibility of interactions on self-healing effects. For this it is intended to apply mending tests on cut samples. Stress-strain tests will provide information about strain induced healing effects. DMA measurements are intended to investigate reversible ionic cluster formation. Finally, crack propagation studies will clarify to what extend reversible interactions may contribute to self-healing in elastomeric materials.