A new paper by Da-Peng Wang entitles "An ultrafast self-healing polydimethylsiloxane elastomer with persistent sealing performance"was published on Mater. Chem. Front. 2019, 3, 1411-1421!
Silicone waterproofing sealants are susceptible to either rupture or scratches due to their low scratch resistance, leading to reduced sealing performance. Herein, an ultrafast self-healing polydimethylsiloxane elastomer is developed to solve this problem. The novel polydimethylsiloxane elastomer, obtained by crosslinking a long chain of poly(dimethylsiloxane) with a tetra-functional biphenyl unit via an aldimine polycondensation reaction, exhibits ultrafast self-healing properties (can be efficiently healed at room temperature within 60 s) although it is quite tough and strong (with Young’s modulus of 120.6 8.2 kPa, elongation 48000%, and adhesive stress values of 30–700 kPa for various substrates). As demonstrated by water absorption tests and self-designed water bag experiments, this new polymer can completely self-heal punctured holes or scratches in seconds and therefore maintain its excellent sealing property. This unique material will have wide commercial applications not only as a sealant, but also in many other industrial fields, including electrochemical sensors, wearable electronics, and biomedical adhesives.
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