Journal
ACS MACRO LETTERS
Volume 1, Issue 11, Pages 1233-1236Publisher
AMER CHEMICAL SOC
DOI: 10.1021/mz300451r
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- le Fonds quebecois de la recherche sur la nature et les technologies of Quebec (FQRNT)
- Chinese Ministry of Education [313036]
- China Scholarship Council (CSC)
- FQRNT
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It is discovered that poly(vinyl alcohol) (PVA) hydrogel prepared using the freezing/thawing method can self-repair at room temperature without the need for any stimulus or healing agent The autonomous self-healing process can be fast for mechanically strong PVA hydrogel yielding a high fracture stress. Investigation on the effect of the hydrogel preparation conditions points out that hydrogen bonding between PVA chains across the interface of the cut surfaces is at the origin of the phenomenon, The key for an effective self-healing is to have an appropriate balance between high concentration of free hydroxyl groups on PVA chains on the cut surfaces prior to contact and sufficient PVA chain mobility in the hydrogel.
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