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

该项目的目的是将自愈原理应用于溴化丁基橡胶（BIIR），这是一种具有高度实际重要性的材料。除了使用氢键形成改性剂之外，还打算使用由聚（离子液体）（PIL）产生的离子相互作用，假设其在材料损伤期间形成的小裂纹的情况下充当分子胶。第一个是关于BIIR与PIL共混物的制备。这里，其目的是防止组分之间的任何种类的化学反应，以保持PIL相的完全流动性。在第二种方法中，打算用PIL接枝BIIR。在这种情况下，由于PIL链的一侧固定到BIIR骨架上，PIL相的流动性受到轻微限制。最终，旨在通过能够形成可逆氢键的双官能交联剂交联BIIR。在每种情况下，BIIR的活性溴基团将有助于定制BIIR以使其最佳利用。以这种方式，将获得三种不同类型的超分子弹性体，其缔合组分具有渐变的移动性。这使得比较调查的影响链的流动性，关联的影响，和可逆的相互作用的自愈效果。为此，拟对切割样品进行修补试验。应力-应变测试将提供有关应变诱导愈合效应的信息。DMA测量旨在研究可逆的离子簇形成。最后，裂纹扩展的研究将澄清在何种程度上可逆的相互作用可能有助于在弹性体材料的自我愈合。

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.