Journal
CHEMISTRYSELECT
Volume 5, Issue 15, Pages 4608-4618Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/slct.201904316
Keywords
Covalent adaptable networks (CANs); Disulfide bonds; Kinetics; Thin films; Waterborne polyurethane (WPU)
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Funding
- National Key Research and Development Program of China [2016YFC0204400]
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Recently, covalent adaptable networks (CANs) based on dynamic exchange reactions have been synthesized, and the research on these materials has been mainly focused on the self-healing behavior and reprocessing properties of CANs. Disulfide bonds can be considered to be a type of dynamic reversible covalent bonds, and exchange reactions of disulfide bonds proceed easily at mild temperatures, which endow materials containing disulfide bonds with self-healing properties and the reprocessability under suitable conditions. Herein, we synthesized a type of waterborne polyurethane (WPU) CAN incorporated with disulfide bonds. A reasonable structural design was used in conjunction with a self-healing kinetic analysis to predict that the highest performing CWPU-8 sample could repair a microcrack at room temperature, which was verified by optical microscopy observations combined with self-healing mechanics. The most important feature of this material is its reprocessing property, which was investigated by rheology tests. These assessments demonstrate that the self-healing behavior and the reprocessability are closely related to exchange reactions of disulfide bonds, and the structure-property relationship provides deep insights into the CANs chemistry.
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