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Authors
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Das, A. ; Sallat, A. ; Böhme, F. ; Suckow, M. ; Basu, D. ; Wießner, S. ; Stöckelhuber, K.W. ; Heinrich, G.
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Title
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Ionic modification turns commercial rubber into a self-healing material
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Date
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02.09.2015
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Number
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47362
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Abstract
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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.
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Publisher
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ACS Applied Materials & Interfaces
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Wikidata
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Citation
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ACS Applied Materials & Interfaces 7 (2015) 20623–20630
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DOI
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https://doi.org/10.1021/acsami.5b05041
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Tags
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self-healing elastomers ionic associations bromobutyl rubbers network structures
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