Self‐healing polyurethane based on disulfide bond and hydrogen bond

Tough and transparent polyurethane networks with self‐healing capability at mild temperature conditions were successfully prepared in a 1‐pot procedure. The self‐healing ability of synthesized polyurethane comes from the covalent disulfide metathesis and non‐covalent H‐bonding. The mechanical testin...

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Bibliographic Details
Published in:Polymers for advanced technologies 2018-01, Vol.29 (1), p.463-469
Main Authors: Jian, Xiaoxia, Hu, Yiwen, Zhou, Weiliang, Xiao, Leqin
Format: Article
Language:English
Subjects:
Ambient temperature
Bonding
Chain mobility
Chemical bonds
Covalence
Covalent bonds
Creep (materials)
Decomposition reactions
disulfide metathesis
hydrogen bond
Hydrogen bonds
Mechanical properties
mechanical property
Mechanical tests
Metathesis
polyurethane
Polyurethane resins
self‐healing
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Summary:Tough and transparent polyurethane networks with self‐healing capability at mild temperature conditions were successfully prepared in a 1‐pot procedure. The self‐healing ability of synthesized polyurethane comes from the covalent disulfide metathesis and non‐covalent H‐bonding. The mechanical testing indicates that disulfide metathesis reforms the covalent bonds on a longer time scale, while H‐bonding gives rise to a healing efficiency of around 46% in the early healing processing. The compromise between mechanical performance and healing capability is reached by tailoring the concentration of disulfide. The tensile strength of the sample with 100% self‐heal efficiency can get to 5.01 MPa, which can be explained by higher mobility of polymer chain under ambient temperature from creep testing.
ISSN:1042-7147
1099-1581
DOI:10.1002/pat.4135