Polysiloxane supramolecular elastomer with high mechanical properties and self-repairing function as well as preparation method and application thereof

Abstract

The invention discloses a polysiloxane supramolecular elastomer with high mechanical properties and a self-repairing function as well as a preparation method and application thereof. The preparation method comprises the following steps of: carrying out a reaction on bis (3-aminopropyl)-terminated polydimethylsiloxane, 1, 6-hexamethylene diisocyanate and 2, 6-diaminopyridine as raw materials to obtain a polysiloxane block copolymer containing a ligand; and dissolving the polysiloxane block copolymer containing the ligand, dropwise adding a metal salt solution to obtain a polysiloxane supramolecular elastomer, and carrying out hot press molding and cold press molding to obtain a target product. The method is simple and mild in condition; reversible metal coordination bonds / ion clusters formed by thepreparation method of the invention endow the polysiloxane supramolecular elastomer with the self-repairing function at a proper temperature while enhancing and toughening a polysiloxane supramolecular network. The prepared polysiloxane supramolecular elastomer has huge application value in a flexible substrate material of wearable equipment.

Description

technical field [0001] The invention belongs to the technical field of supramolecular elastomers and conductive elastomers, and in particular relates to a polysiloxane supramolecular elastomer with high mechanical performance (strong and tough) and self-repairing function and its preparation method and application. Background technique [0002] In recent years, with the popularization of electronic smart devices, wearable devices represented by smart watches, smart bracelets and earphones have appeared on the market. Wearable devices have increasing requirements for substrate materials, and the research on flexible substrate materials with excellent mechanical properties (strong and tough) and self-healing functions will also have more practical significance. Polysiloxane is very suitable as a substrate material for wearable devices due to its excellent biocompatibility, but it generally faces the following two problems: 1) Realizing high tensile strength and high tensile st...

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Problems solved by technology

However, the tensile strength of the elastic materials prepared by the two is less than 1MPa, and the tensile toughness is less than 2MJ / m 3 (The tensile toughness value is estimated from the stress-strain curve reported in the patent), which will limit the application of polysiloxane elastomers in the actual environment

[0004] Chinese invention patent CN 102604298A discloses a preparation method of a polysiloxane elastic material with ultra-high self-healing efficiency at room temperature; Mechanical properties, and the self-repair function is realized by the interaction of hydrogen bonds of various strengths. The obtained elastomer can completely restore the original mechanical properties after repairing at room temperature for 4 hours, and has relatively high tensile toughness (11.3MJ / m 3 , estimated according to the stress-strain curve reported in the patent), but its tensile strength is still at a relatively low level, less than 1MPa

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