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Synthesis and Characterization of Healable Waterborne Polyurethanes with Cystamine Chain Extenders.

ABSTRACT: In this study, environmentally friendly, self-healing waterborne polyurethanes (WPUs) were prepared based on the disulfide metathesis reaction in cystamine. The cystamine acted as a chain extender in the WPU film, which showed a high mechanical strength of 19.1 MPa. The possibility of self-healing reaction was simultaneously modeled via liquid chromatography-mass spectrometry (LC-MS). WPU was confirmed to self-heal a surface crack thermally after a scratch test, and the efficiency was measured by comparing the mechanical properties before and after a cut-and-healing test. In addition, the disulfide-thiol exchange reaction was confirmed to occur in WPU with cystamine as a chain extender and 2-mercaptoethanol. Hot press tests confirmed the possibility of reprocessing the WPU. The WPU incorporating disulfide groups showed great potential as a smart self-healing material.

SUBMITTER: Lee DI

PROVIDER: S-EPMC6515350 | biostudies-literature | 2019 Apr

REPOSITORIES: biostudies-literature

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Synthesis and Characterization of Healable Waterborne Polyurethanes with Cystamine Chain Extenders.

Lee Dae-Il DI Kim Seung-Hyun SH Lee Dai-Soo DS

Molecules (Basel, Switzerland) 20190416 8

In this study, environmentally friendly, self-healing waterborne polyurethanes (WPUs) were prepared based on the disulfide metathesis reaction in cystamine. The cystamine acted as a chain extender in the WPU film, which showed a high mechanical strength of 19.1 MPa. The possibility of self-healing reaction was simultaneously modeled via liquid chromatography-mass spectrometry (LC-MS). WPU was confirmed to self-heal a surface crack thermally after a scratch test, and the efficiency was measured b ...[more]

PMID: 30995774

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