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Intelligent Rubber with Tailored Properties for Self-healing and Shape Memory
发布时间:2015-10-22 点击次数:477次

Intelligent Rubber with Tailored Properties for Self-healing and Shape Memory

A strategy of combining covalent and non-covalent cross-links to construct multifunctional rubber materials with intelligent self-healing and shape memory ability is demonstrated. The rubbers were prepared by self-assembly of complementary polybutadiene oligomers bearing carboxylic acid and amine groups through reversible ionic hydrogen bonds via acid-base reaction, and then further covalently cross-linking by tri-functional thiol via thiol-ene reaction. The resulting polymers exhibit self-healing and shape memory functions owing to the reversible ionic hydrogen bonds. The covalent cross-linking density can be tuned to achieve tailorable mechanical and stimuli-responsive properties: a low covalent cross-linking density remains the rubber remarkable self-healing capability at ambient temperature without any external stimulus, while a high covalent cross-linking density improves the mechanical strength and induces shape memory behavior, but effective self-healing needs to be triggered at high temperature. This strategy might open a promising pathway to fabricate intelligent multifunctional polymers with versatile functions.

 

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