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Improved self-healing properties and crack growth resistance of polydimethylsiloxane elastomers with dual-capsule room-temperature healing systems

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Abstract

Two types of microcapsules were prepared by in situ polymerization with poly(urea-formaldehyde) (PUF) as the shell material. The core materials of the microcapsules contained Sylgard 184A gum (labeled as capsule I) and hydrogen silicone oil (labeled as capsule II). Capsule types I and II were characterized by optical microscopy, Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). Capsule types I and II were incorporated into silicone rubber polydimethylsiloxane (PDMS) at an appropriate proportion to construct a self-healing system. The healing efficiency initially increases and then decreases with the increased proportion and addition of the two capsules. The maximum self-healing efficiency is obtained with a value of 70.5% by the incorporation of 10 wt% miscellaneous microcapsules when the weight proportion of capsule types II and I is 0.6. Cracks in the PDMS/capsule composites almost disappear with an increased healing time of up to 24 h at room temperature, indicating improved healing properties with a prolonged healing time.

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Funding

This work was financially supported by the National Natural Science Foundation of China (51103048), the Joint Fund of Ministry of Education (6141A020332017), the Guangdong Natural Science Foundation Project (2018A0303130023), the Fundamental Research Funds for the Central Universities (2018KZ07), and Guangzhou Industrial Technology Key Project (201902010059).

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  1. School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China

    Zhenhang Yin, Jianhua Guo, Junxia Qiao & Xuming Chen

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  1. Zhenhang Yin
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  2. Jianhua Guo
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  3. Junxia Qiao
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  4. Xuming Chen
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Correspondence to Jianhua Guo.

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Yin, Z., Guo, J., Qiao, J. et al. Improved self-healing properties and crack growth resistance of polydimethylsiloxane elastomers with dual-capsule room-temperature healing systems. Colloid Polym Sci 298, 67–77 (2020). https://doi.org/10.1007/s00396-019-04587-2

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  • DOI: https://doi.org/10.1007/s00396-019-04587-2

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