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    Designed preparation of silicone protective materials with controlled self-healing and toughness properties

    Year: 2020

    Journal: Prog. Org. Coat., Volume 140, MAR

    Authors: Chen, Guangmeng; Sun, Zhiyong; Wang, Yameng; Zheng, Jiyong; Wen, Shifeng; Zhang, Jinwei; Wang, Li; Hou, Jian; Lin, Cunguo; Yue, Zhufeng

    Organizations: National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51872237, 51801159, 21301161]; Natural Science Basic Research Plan in Shaanxi Province of China [2017JM5098]; Aeronautical Science Foundation of China [2017ZF53069]; Provincial Nature Science Foundation of Shaanxi [2018JM5032]; Filed Foundation of Equipment Pre-research [61409220304]; Taishan Scholars Project of Shandong

    Keywords: Poly(dimethylsiloxane) (PDMS); Self-healing property; Dynamic imine bond; Sacrificed hydrogen bond; Anti-Corrosion

    Silicone elastomers with adjustable self-healing and mechanical properties have been prepared by the step-by-step synthesis procedure that 4,4'-methylenebis-(cyclohexyl isocyanate) (HMDI) and isophthalaldehyde (IPAL) sequentially cross-linked with aminopropyl terminated polydimethylsiloxane (AP-PDMS). The characteristic imine and urea groups that related to self-healing ability and toughness have been detected in the silicone elastomers. The tensile stress of elastomers increases from similar to 3 KPa to similar to 1.0 MPa as increasing the ratio of urea to imine groups (0.35-3.3), while the elongation at the break still keeps in the range of 700 - 800 %. It was verified that the hydrogen bonding network exists in the self-healing polymers, which is responsible for its enhanced mechanical properties. The dynamic interaction of imine groups decreases with the increase of urea groups due to the limited movement of the polymer chain by hydrogen bonds, resulting in the degeneration of self-healing properties. Expectedly, the self-healing polymer (PDMS-UI-2) exhibits outstanding protective ability against corrosion of carbon steel in 3.5 % NaCl solution, owing to its rapid self-repairing property. Therefore, this work provides a facile and effective method to fabricate the self-healing silicon materials with adjustable self-repairing capability and mechanical property, which can be potentially used as protective coatings in the marine environment.
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