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Self-healing supramolecular elastomers based on the multi-hydrogen bonding of low-molecular polydimethylsiloxanes: Synthesis and characterization

Authors

  • Anqiang Zhang,

    Corresponding author
    1. College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
    • College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
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  • Lin Yang,

    1. College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
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  • Yaling Lin,

    Corresponding author
    1. College of Resource and Environment, South China Agriculture University, 483 Wushan Road, Guangzhou 510642, Guangdong, China
    • College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
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  • Lishan Yan,

    1. College of Resource and Environment, South China Agriculture University, 483 Wushan Road, Guangzhou 510642, Guangdong, China
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  • Hecheng Lu,

    1. College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
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  • Lianshi Wang

    1. College of Material Science and Engineering, South China University of Technology, 381 Wushan Road, Guangzhou 510641, Guangdong, China
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Abstract

Novel self-healing supramolecular elastomers based on polydimethylsiloxanes (SESi) were synthesized from a mixture of polydimethylsiloxanes derivers with single, di-, or tri-carboxylic acid groups (PDMS–COOHx, where x = 1, 2, and 3, respectively), diethylene triamine, and urea with a two-stage procedure. The reactions and the final products were tracked, characterized, and confirmed by Fourier transform infrared spectroscopy, 1H-NMR, differential scanning calorimetry, dynamic mechanical analysis, and gel permeation chromatography. Compared with a supramolecular rubber based on dimer acid (reported previously) with a similar synthesis procedure, the SESi showed a lower glass-transition temperature of about −113°C for the softer chain of polydimethylsiloxane and showed real rubberlike elastic behavior and self-healing properties at room temperature or even lower temperatures. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

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