A thermal self-healing polyurethane thermoset based on phenolic urethane

Thermosetting polyurethanes have excellent elastic properties and solvent resistance, but they cannot be reshaped like thermoplastic polymers after molding. In this study, we designed a thermosetting polyurethane based on a reversible reaction between isocyanates and phenolic hydroxyls instead of al...

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Bibliographic Details
Published in:Polymer journal Vol. 49; no. 11; pp. 775 - 781
Main Authors: Cao, Shan, Li, Shouhai, Li, Mei, Xu, Lina, Ding, Haiyang, Xia, Jianling, Zhang, Meng, Huang, Kun
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 01.11.2017
Nature Publishing Group
Subjects:
639/638/298/303
639/638/455/941
Adhesive bonding
Biomaterials
Bioorganic Chemistry
Bond strength
Chemistry
Chemistry and Materials Science
Chemistry/Food Science
Coatings
Cooling
Corrosion resistance
Decomposition
Elastic properties
Elastomers
Elongation
Isocyanates
original-article
Polymer Sciences
Polyurethane
Polyurethane resins
Repair
Self healing materials
Surfaces and Interfaces
Tensile strength
Thermosetting resins
Thin Films
ISSN:0032-3896, 1349-0540
Online Access:Get full text
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Summary:Thermosetting polyurethanes have excellent elastic properties and solvent resistance, but they cannot be reshaped like thermoplastic polymers after molding. In this study, we designed a thermosetting polyurethane based on a reversible reaction between isocyanates and phenolic hydroxyls instead of alcoholic hydroxyls. The phenolic urethane partially decomposed above 120 °C, but the phenolic hydroxyl and isocyanate groups reconnected upon cooling. These reversible urethane bonds contributed to the thermal self-repair of the thermosetting polyurethane network. This thermosetting elastomer was organic-insoluble below 120 °C. Compared to the original material, the healed thermoset preserved approximately 70% of its tensile strength and exhibited 86% elongation at break. This thermosetting polyurethane can be applied in self-healing coatings or adhesives. We designed a thermosetting polyurethane based on the reversible reaction between isocyanates and phenolic hydroxyls instead of alcoholic hydroxyls. The phenolic urethane partially decomposed at above 120 °C, but the phenolic hydroxyl and isocyanate reconnected upon cooling. This reversible urethane bond contributed to the thermal self-repair of the thermosetting polyurethane network and can be applied into self-healing coatings or adhesives.
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ISSN:0032-3896
1349-0540
DOI:10.1038/pj.2017.48