Abstract
Liquid trimethoxy silane-functionalized cis-polybutadiene (cis-PB-Si(OMe)3), possessing number-average molecular weights of cis-PB segments (Mn,PB) ranging from 1800 g/mol to 5400 g/mol, with cis-1,4 content of ca. 80% and high functionality (>96%) could be synthesized by coordination copolymerization of living cis-PB chain ends with ethenyltrimethoxy-silane with neodymium-based catalytic system. The silicon hydroxyl-functionalized cis-polybutadiene (cis-PB-Si(OH)3)-based micelles in water have been achieved by in situ hydrolysis of cis-PB-Si(OMe)3 in hexane/water mixture (pH=6.8) at 70 °C and by sequential removal of residue hexane. The size of the above micelles with soft elastic cis-PB cores could be remarkably enlarged by loading SiO2 nanoparticles on their surfaces via hydrogen bonding interaction. Giant supramolecular long chain aggregates or networks formed by hydrogen bonding interaction and possible O—Si—O chemical bonds between cis-PB-Si(OH)3-based micellar surfaces had relatively large size and thus precipitated from water after several months of storage, leading to production of cis-PB-Si(OH)3 solid elastomer with extremely low Tg at −107.0 °C. The left cis-PB-Si(OH)3-based micelles in water with relatively small size gradually formed the water-insoluble cis-PB-Si(OH)3-based supramolecular aggregates or networks. The cis-PB-Si(OH)3-based supramolecular elastomer exhibited excellent self-healing property within 60 s at 25 °C. The elastomer (20 mg) in a joint of 25 mm × 30 mm (2.7 mg/cm2) provided very strong adhesion for two pieces of glass and the bound glass keep unchanged at room temperature for 98 h even hung with 100 g of steel column below. The cis-PB-Si(OH)3-based supramolecular elastomer would have potential applications in adhesives, self-healing materials, damping materials and elastic materials.
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This work was financially supported by the National Natural Science Foundation of China (NSFC) (Nos. 21634002, 51790501 and 51521062) and the Fundamental Research Funds for the Central Universities (Nos. XK1802-2 and XK1802-1).
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Rapid Self-healing and Strong Adhesive Elastomer via Supramolecular Aggregates from Core-shell Micelles of Silicon Hydroxyl-functionalized cis-Polybutadiene
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Zheng, YY., Zhu, H., Tan, Y. et al. Rapid Self-healing and Strong Adhesive Elastomer via Supramolecular Aggregates from Core-shell Micelles of Silicon Hydroxyl-functionalized cis-Polybutadiene. Chin J Polym Sci 41, 84–94 (2023). https://doi.org/10.1007/s10118-022-2808-z
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DOI: https://doi.org/10.1007/s10118-022-2808-z