Open Access

ARTICLE

Thermally Reversible, Self-Healing Polyurethane Based on Propyl Gallate and Polyurethane Prepolymers with Varied Isocyanate Content

Haiyang Ding^1,2,3,4,5, Xiaohua Yang^1,2,3,4,5, Lina Xu^1,2,3,4,5, Shouhai Li^1,2,3,4,5, Jianling Xia^1,2,3,4,5, Mei Li^1,2,3,4,5,*

1 Institute of Chemical Industry of Forest Products (ICIFP), Nanjing, 210042, China
2 Key Laboratory of Biomass Energy and Material, Nanjing, 210042, China
3 National Engineering Laboratory for Biomass Chemical Utilization, Nanjing, 210042, China
4 Key and Open Laboratory on Forest Chemical Engineering, SFA, Nanjing, 210042, China
5 Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University, Nanjing, 210042, China

* Corresponding Author: Mei Li. Email:

Journal of Renewable Materials 2020, 8(1), 1-11. https://doi.org/10.32604/jrm.2020.08165

Received 07 August 2019; Accepted 21 October 2019; Issue published 01 January 2020

Abstract

Thermosetting polyurethanes are widely used in various fields owing to their excellent elasticity, strength and solvent resistance. Three environmental friendly propyl gallate-based self-healing polyurethanes were prepared from polyurethane prepolymers with varying isocyanate content. The thermal stabilities of the polyurethanes were tested using thermogravimetric analysis. Their self-healing and mechanical properties were analyzed using a universal testing machine and dynamic thermomechanical analysis. The polyurethanes were found with high self-healing ability and excellent mechanical properties due to the absence of phenolic carbamate. These qualities improved with increased isocyanate content and the prolonged selfhealing time. We found, therefore, that the propyl gallate-based polyurethane has potential for use in industrial applications as self-healing materials.

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