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A colorless, transparent and self-healing polyurethane elastomer modulated by dynamic disulfide and hydrogen bonds

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Abstract

Self-healing polyurethanes (PUs) represent a new type of functional material which are highly desirable for applications such as surface protection coatings and transparent films. However, it is still challenging to obtain self-repairable PUs with good mechanical properties and excellent optical properties. Herein, in view of molecular design, a self-healing thermoplastic polyurethane (TPU) was designed with polytetramethylene ether glycol (PTMEG) as the soft segment and aliphatic isocyanate (m-xylylene diisocyanate, XDI) and aliphatic disulfide (bis(2-hydroxyethyl)disulfide, HEDS) as the hard segment. The TPU exhibited widely tunable mechanical properties, i.e., tensile stress values of 3.51–8.12 MPa with elongation at break values of 825–1320%. The cooperation of dynamic disulfide bonds and hydrogen bonding endowed the TPU elastomer with self-healing capacity and a self-healing efficiency of about 39% at a moderate temperature. Both the amorphous phase structure and XDI chemical structure contributed to a colorless, transparent and anti-yellowing TPU film with nearly 97% transparency and long-term optical stability. The tough, colorless and transparent self-healable elastomers have wide applications in optical and protective fields, including in automotive laminated glass, flexible displays, printers, and photographic equipment cleaning scrapers.

Graphical abstract: A colorless, transparent and self-healing polyurethane elastomer modulated by dynamic disulfide and hydrogen bonds

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Article information


Submitted
31 Dec 2019
Accepted
10 Mar 2020
First published
11 Mar 2020

New J. Chem., 2020, Advance Article
Article type
Paper

A colorless, transparent and self-healing polyurethane elastomer modulated by dynamic disulfide and hydrogen bonds

X. Wang, H. Zhang, B. Yang, L. Wang and H. Sun, New J. Chem., 2020, Advance Article , DOI: 10.1039/C9NJ06457E

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