Volume 135, Issue 31 46532
Article

Heat-triggered poly(siloxane-urethane)s based on disulfide bonds for self-healing application

Xinxiu Wu

Xinxiu Wu

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

Nano Science and Technology Institute, University of Science and Technology of China (USTC), Suzhou 215123, China

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Jinhui Li

Jinhui Li

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

Department of Materials Science and Engineering, City University of Hong Kong, Kowloon 999077, Hong Kong, China

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Gang Li

Gang Li

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

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Lei Ling

Lei Ling

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

Nano Science and Technology Institute, University of Science and Technology of China (USTC), Suzhou 215123, China

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Guoping Zhang

Corresponding Author

Guoping Zhang

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

Department of Electronic Engineering, Faculty of Engineering, Chinese University of Hong Kong, Hong Kong, China

Correspondence to: G. Zhang (E-mail: [email protected])Search for more papers by this author
Rong Sun

Rong Sun

Shenzhen Institutes of Advanced Technology, University of Chinese Academy of Sciences, Shenzhen 518055, China

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Ching-Ping Wong

Ching-Ping Wong

Department of Electronic Engineering, Faculty of Engineering, Chinese University of Hong Kong, Hong Kong, China

School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332

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First published: 21 April 2018
Citations: 102

ABSTRACT

Polydimethylsiloxane (PDMS) is one of the most widely employed silicon-based polymers for its high flexibility, low usage temperature, excellent water resistance, outstanding electrical insulting property, and physiological inert, etc. However, the covalent-bonded SiO bonds are unable to heal automatically when damaged, which would result in the failure of the materials and devices. Disulfide bond based polymers show high healing efficiency at moderate temperature and have been investigated intensively. Herein, we report a PDMS-based polyurethane self-healing polymer (PDMS-PU) modified with disulfide bonds, which exhibited a reinforced thermal stability, excellent stretchability, and satisfactory self-healing ability. The effect of different ratio of PDMS and disulfide bond contents on the elastomer properties was investigated. With the increase of PDMS content, the decomposition temperature of the PDMS-PU-3 (332 °C) elastomer with highest content of PDMS was increased by 34 °C compared to PDMS-PU-1 (298 °C) with lowest content of PDMS and exhibited a largest elongation at break of 1204%. PDMS-PU-1 with highest content of disulfide bond possessed a highest healing efficiency of 97%. The results indicated the PDMS-PU elastomers can be used as self-healing flexible substrate for flexible electronics. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46532.

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