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Water-adaptive and repeatable self-healing polymers bearing bulky urea bonds

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Abstract

Self-healing polymers bearing reversible and bulky urea bonds were prepared by free-radical copolymerization followed by crosslinking with diisocyanates. Linear prepolymers (PtB) were first synthesized from 2-(tert-butylamino)ethyl methacrylate (tBAEMA), methyl methacrylate (MMA), and n-butyl acrylate (BA), in a molar ratio of 1 : 10 : 10, and then crosslinked with 1,6-diisocyanatohexane (HDI) or isophorone diisocyanate (IPDI) to fabricate self-healing polymers. The reversible bonding–debonding between the tBAEMA of the polymer backbone and the isocyanate units of the crosslinker in the self-healing polymer facilitates rapid, repeatable, and water-adaptive self-healing performance, which has been extensively investigated using 1H-NMR, DSC, FT-IR, AFM, optical microscopy, and rheometric analyses. Percentage recovery (%R) and self-healing efficiency (%SHE) were also studied using tensile and single-scratch tests, respectively, and compared with a control sample. It was revealed through extensive analyses that self-healing against a single scratch can be accelerated and repeated up to a certain number of times even in water, although the self-healing polymers are not water-resistant. We also demonstrated that a self-healable tube capable of containing flowing water could be fabricated from a self-healing polymer sheet by using reversible bonding–debonding characteristics of a reversible bulky urea bond.

Graphical abstract: Water-adaptive and repeatable self-healing polymers bearing bulky urea bonds

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Publication details

The article was received on 27 Sep 2017, accepted on 26 Oct 2017 and first published on 27 Oct 2017


Article type: Paper
DOI: 10.1039/C7PY01655G
Citation: Polym. Chem., 2017, Advance Article
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    Water-adaptive and repeatable self-healing polymers bearing bulky urea bonds

    J. I. Park, A. Choe, M. P. Kim, H. Ko, T. H. Lee, S. M. Noh, J. C. Kim and I. W. Cheong, Polym. Chem., 2017, Advance Article , DOI: 10.1039/C7PY01655G

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