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Lee, Seung Geol
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Super-tough self-healable multiphasic supramolecular plastic via sequence-biased statistical copolymerization

Author(s)
Lee, WoojinYu, Yeong JunKang, HaisuKwon, Sung HyunLee, Seung GeolChung, Jae WooKwak, Seung-Yeop
Issued Date
2024-01
DOI
10.1039/d3ta05808e
URI
https://scholarworks.unist.ac.kr/handle/201301/81683
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.12, no.3, pp.1325 - 1864
Abstract
Achieving both mechanical robustness and facile healing in self-healable supramolecular materials remains a challenge. This study presents a complementary design for a self-healable supramolecular plastic material, namely, ureidopyrimidinone (UPy)-end functionalized star poly(3-caprolactone-co-3-decalactone) (USPCD), based on the kinetics of sequence-biased statistical copolymerization, which depend on the bulkiness of monomers. The copolymerization results in phase separation, wherein the soft phases bear UPy hydrogen bonds and the hard phases contain crystalline bonds. The soft phases can induce a dynamic exchange of UPy moieties and consequent facile healing, whereas the hard phases can contribute to mechanical versatility. Eventually, the composition and sequence control of repeating units in the USPCD significantly affect the mechanical and healing characteristics. USPCD92, with similar to 8 mol% poly(3-decalactone) (PDL) adjacent to the UPy-end moieties, exhibits a super-tough plastic behavior (similar to 44 MJ m(-3)), rather than rubber-like behavior, with an excellent healing performance of similar to 99% at 50 degrees C after 10 min treatment.
Publisher
ROYAL SOC CHEMISTRY
ISSN
2050-7488
Keyword
EPSILON-DECALACTONEHEALING POLYMERSHIGH-STRENGTHNETWORKRUBBERHYDROGELSENABLESDESIGN

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