Journal
EUROPEAN POLYMER JOURNAL
Volume 146, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.eurpolymj.2020.110204
Keywords
Self-healing; Ultrahydrophobic; ENR; POSS; Diels-Alder
Categories
Funding
- SERB
- CEAT Tyres, Mumbai
- CSIR, New Delhi
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The Diels-Alder reaction was used to introduce furan groups into a commercially available elastomer, resulting in a modified elastomer with self-healing and ultrahydrophobic properties, showing improved mechanical performance and healing efficacy.
Inclusion of self-healing and water-repellant properties within a commercially available elastomer could be of great significance in prolonging its longevity and sustainability. Herein, Diels-Alder (DA) 'click' reaction was employed to introduce self-healing and ultrahydrophobic features in commercially available ENR. In this case, the furfuryl groups were grafted onto the backbone of the pristine elastomer, followed by their DA 'click' modification with polyhedral oligomeric silsesquioxane isobutyl maleimide (POSSMI) molecules. Besides the provision of dynamic covalent linkages, the DA modified elastomer showed significantly improved hydrophobicity [water contact angle (WCA) > 140 degrees], because of the presence of nano-sized POSS materials on the surface. In contrast to pristine ENR, the DA adduct POSS hybrid elastomer showed remarkably improved thermal stability, surface hardness, and adhesion to metal substrates. On heating at 120 degrees C, the furan-maleimide DA covalent linkages cleaved, which re-installed on annealing at 60 degrees C. In consequence, the DA elastomers exhibited relatively higher mechanical and healing efficacy than the pristine ENR.
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