A kind of light reflective film and its preparation method and sensor

Abstract

The invention discloses a light reflection film, a preparation method thereof and a sensor. The preparation method of the light reflection film comprises mixing raw materials including a liquid crystal monomer, a chain extender and a photoinitiator, heating and reacting to form a cholesteric main chain liquid crystal Polymers; liquid crystal monomers include chiral liquid crystal monomers and achiral liquid crystal monomers; cholesteric main chain liquid crystal polymers and porogens are mixed into a mixture, covered with a parallel alignment layer, and the mixture is covered on On the parallel alignment layer, ultraviolet light is irradiated, and then the porogen is removed to obtain a cholesteric main chain liquid crystal elastomer with a porous structure; a hydrophilic polymerizable salt is added to the cholesteric main chain liquid crystal elastomer, and then The ultraviolet light irradiates to polymerize the hydrophilic polymerizable salt to form a hydrophilic polymer network, and the hydrophilic polymer network and the cholesteric main chain liquid crystal elastomer form an interpenetrating polymer network. Through the above method, the light reflective film can be prepared to be elastic, and have reversible water response and tensile strain response characteristics.

Description

technical field [0001] The present invention relates to the technical field of light reflective materials, in particular to a light reflective film, a preparation method thereof and a sensor. Background technique [0002] Liquid crystal materials have a great impact on people's daily lives, and are used in displays such as televisions and personal computers. Liquid crystal properties enable materials in the liquid crystal state to have interesting functions such as self-assembly, remotely controllable mobility, large birefringence, and anisotropy under various physical properties such as electric fields, magnetic fields, illumination, and mechanics . Cholesteric liquid crystal is a special class of photonic materials with iridescent structure. Cholesteric liquid crystals exhibit a helical structure with the twist axis perpendicular to the local director, resulting in reflection at specific wavelengths due to the obtained refractive index changes along the helical axis. Th...

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Problems solved by technology

But most of the traditional water-responsive cholesteric materials usually have a glass transition temperature higher than room temperature, when the temperature is lower than the glass transition temperature, the film is in the glassy state, due to the vitrification of the network and the decrease of the chain mobility, the polymerization The material chain is "frozen", the film is fixed, its texture becomes brittle, and it lacks certain elasticity. When such a film is subjected to external forces (such as touching, stretching, pressure, etc.), its surface is easily damaged, which is not conducive to long-term use.

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