A polyurethane-based shape memory polymer, polymer electrolyte and its preparation

Abstract

The invention belongs to the technical field of polymer electrolytes, and more specifically relates to a polyurethane-based shape memory polymer, a polymer electrolyte and its preparation. A polymer with shape memory function is obtained by polymerizing a polyurethane crosslinking agent, an acrylate crosslinking agent containing a disulfide bond, a polyethylene glycol acrylate monomer, and a photoinitiator under ultraviolet light; the polymerization Polyurethane cross-linked network in the compound is used as the stationary phase of the initial shape, and the polyethylene glycol block and the polyurethane chain in the cross-linked network structure are used as reversible phases to undergo melting transition and glass transition respectively with temperature changes, thereby making the polymer reversible solidified or softened, so as to obtain a shape-memory functional polymer with a wide transition temperature and the ability to fix the shape at room temperature, aiming to solve the problem that the transition temperature of the prior art polymer electrolyte for fixing the shape is too low (minus forty degrees Celsius ), it is not convenient to meet the technical problems of practical application requirements.

Description

technical field [0001] The invention belongs to the technical field of polymer electrolytes, and more specifically relates to a polyurethane-based shape memory polymer, a polymer electrolyte and its preparation. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, and good safety performance, and are widely used in portable electronic devices and energy vehicles. However, the current commercial lithium-ion batteries generally use liquid electrolytes formed by dissolving lithium salts in organic carbonates, which have defects such as flammability, explosion, and poor mechanical properties. Safety issues greatly limit the development of lithium-ion batteries. The emergence of polymer electrolytes effectively solves the above-mentioned defects of liquid electrolytes, and polymer electrolytes have the advantages of light weight, easy processing, wide electrochemical window and good chemical stability, and have become i...

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Problems solved by technology

[0005] Aiming at the defects of the prior art, the object of the present invention is to provide a polyurethane-based shape memory polymer, a polymer electrolyte and a preparation method thereof, by combining a polyurethane cross-linking agent, an acrylate cross-linking agent containing a Polyethylene glycol acrylate monomer and photoinitiator are polymerized under ultraviolet light to obtain a polymer with shape memory function; the polyurethane crosslinked network in the polymer is used as the stationary phase of the initial shape, and polyethylene glycol Polyurethane chains with block and cross-linked structures undergo melting transition and glass transition as a reversible phase with temperature changes, thereby reversibly solidifying or softening the polymer, thereby obtaining a shape-memory functional polymer with a wider transition temperature. To solve the technical problem that the conversion temperature of the prior art polymer electrolyte for fixed shape is too low (minus forty degrees Celsius), which is not convenient to meet the needs of practical applications

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