Authors Das, A. ; Sallat, A. ; Böhme, F. ; Suckow, M. ; Basu, D. ; Wießner, S. ; Stöckelhuber, K.W. ; Heinrich, G.
Title Ionic modification turns commercial rubber into a self-healing material
Date 02.09.2015
Number 47362
Abstract Invented by Charles Goodyear, chemical cross-linking of rubbers by sulfur vulcanization is the only method by which modern automobile tires are manufactured. The formation of these cross-linked network structures leads to highly elastic properties, which substantially reduces the viscous properties of these materials. Here, we describe a simple approach to converting commercially available and widely used bromobutyl rubber (BIIR) into a highly elastic material with extraordinary self-healing properties without using conventional cross-linking or vulcanising agents. Transformation of the bromine functionalities of BIIR into ionic imidazolium bromide groups results in the formation of reversible ionic associates that exhibit physical cross-linking ability. The reversibility of the ionic association facilitates the healing processes by temperature- or stress-induced rearrangements, thereby enabling a fully cut sample to retain its original properties after application of the self-healing process. Other mechanical properties, such as the elastic modulus, tensile strength, ductility, and hysteresis loss, were found to be superior to those of conventionally sulfur-cured BIIR. This simple and easy approach to preparing a commercial rubber with self-healing properties offers unique development opportunities in the field of highly engineered materials, such as tires, for which safety, performance, and longer fatigue life are crucial factors.
Publisher ACS Applied Materials & Interfaces
Citation ACS Applied Materials & Interfaces 7 (2015) 20623–20630
Tags self-healing elastomers ionic associations bromobutyl rubbers network structures

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