Journal
POLYMER
Volume 53, Issue 13, Pages 2691-2698Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymer.2012.04.016
Keywords
Self-healing; Polyurethane; Coumarin
Categories
Funding
- Natural Science Foundation of China [20874117, 50903095, 51073176, U0634001]
- Doctoral Fund of Ministry of Education of China [20090171110026]
- Science and Technology Program of Guangdong Province [2010B010800021]
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A novel polyurethane was synthesized, which consisted of isophorone diisocyanate, polyethylene glycol and photo-reversible moiety 5,7-bis(2-hydroxyethoxy)-4-methylcoumarin. By taking advantage of reversible photodimerization and photocleavage habit of coumarin, the polyurethane can be repeatedly crosslinked and de-crosslinked under successive UV irradiations at 350 and 254 nm. More importantly, damages in crosslinked version of the polyurethane can be re-bonded through chain reconnection on fracture surfaces resulting from the photochemical reactions, as characterized by mechanical strength restoration tests. Compared to the previous proof-of-concept trial with monohydroxyl coumarin derivatives as the photosensitive groups, the application of dihydroxyl coumarin derivatives in the present work prevented the undesirable gelation during synthesis and enabled properties-oriented structure adjustment of polymerization products. Besides, structure-performance relationship study of the polyurethane revealed that rubbery domains resulting from microphase separation were necessary for the photo-remending with high efficiency. (c) 2012 Elsevier Ltd. All rights reserved.
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