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Polymers 2019, 11(3), 503;

Synthesis of Self-Healing Waterborne Polyurethane Systems Chain Extended with Chitosan

Division of Semiconductor and Chemical Engineering, Chonbuk National University, Baekjedaero 567, Deokjin-gu, Jeonju, Chonbuk 54896, Korea
Author to whom correspondence should be addressed.
Contributed equally to this work.
Received: 30 January 2019 / Revised: 9 March 2019 / Accepted: 12 March 2019 / Published: 15 March 2019
(This article belongs to the Special Issue Chitin and Chitosan: Properties and Applications)
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In this study, the self-healing properties of waterborne polyurethane (WPU) were implemented by chitosan as a chain extender of polyurethane prepolymers. The physical properties and self-healing efficiency of WPU were studied by changing the molar fractions of chitosan from 0.1 to 0.3. After thermal treatment for 24 h at 110 °C, the self-healing efficiency for the tensile strength of the highest chitosan content (WPU-C3) was found to be 47%. The surface scratch was also completely restored. The efficiency of the sample with the lowest chitosan content (WPU-C1) was found to be 35%, while that of the control sample without chitosan (WPU-C0) was 4%. The self-healing properties of the as-prepared films were attributed to the exchange reactions between the hydroxyl groups of chitosan and the urethane groups in the films at elevated temperature. It is inferred that self-healing WPU can be synthesized by chain extension with chitosan. View Full-Text
Keywords: waterborne polyurethane; self-healing; chitosan; exchange reactions waterborne polyurethane; self-healing; chitosan; exchange reactions

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Lee, D.-I.; Kim, S.-H.; Lee, D.-S. Synthesis of Self-Healing Waterborne Polyurethane Systems Chain Extended with Chitosan. Polymers 2019, 11, 503.

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