Project Details
Projekt
Self-healing elastomers based on bromobutyl rubber with reversible interacting groups
Applicants
Dr. Frank Böhme; Professor Dr. Gert Heinrich
Subject Area
Polymer Materials
Term
from 2014 to 2019
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 259605737
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.
DFG Programme
Priority Programmes
Participating Persons
Dr. Amit Das; Dr. Hartmut Komber; Holger Scheibner; Dr. Klaus Werner Stöckelhuber; Professorin Brigitte Voit, Ph.D.
