Authors Salaeh, S. ; Das, A. ; Wießner, S. ; Stapor, M.
Title Vitrimer-like material based on a biorenewable elastomer crosslinked with a dimeric fatty acid
Date 25.03.2021
Number 59322
Abstract repairable and weldable is presented in this paper. Dimer fatty acid (DFA) was used as cross-linker in ENR50 to generate ß-hydroxy ester linkages through epoxide ring-opening reaction between carboxylic groups in DFA and epoxide groups in ENR. Meanwhile, a transesterification catalyst (Zinc catalyst) provided a dynamic covalent network in the cross-linked ENR, which is a vitrimer-like elastomer. The mechanical properties and cross-link density of this vitrimer-like rubber could be tailored by changing the concentration of DFA. Using DFA at approximately 1.5 mmol COOH (~1.23 phr) in ENR50 offered good tensile strength and elongation at break. Stress relaxation showed that the reaction rate of bond exchange in DFA-cured ENR could be significantly accelerated by increasing temperature, suggesting malleable flow of these vitrimers. Moreover, the prepared vitrimer-like elastomer showed repairable, weldable, recyclable and reprocessable characteristics. This technological approach is significant in providing a covalent adaptive network in vulcanized rubber, which has great potential for further development of environmentally friendly rubber vulcanizates.
Publisher European Polymer Journal
Citation European Polymer Journal 151 (2021) 110452

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