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Stress-responsive multi-color-change composite film material as well as preparation method and application thereof

A composite film and multi-color technology, which is applied in the fields of instruments, optics, nonlinear optics, etc., can solve the problems of optical film difficulties and achieve the effect of excellent performance and compact structure

Active Publication Date: 2019-08-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Building ordered nanocrystal arrays in elastic solid-state films for optical films with reversible stress response remains difficult

Method used

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  • Stress-responsive multi-color-change composite film material as well as preparation method and application thereof
  • Stress-responsive multi-color-change composite film material as well as preparation method and application thereof
  • Stress-responsive multi-color-change composite film material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 The shown preparation method prepares the composite film provided by the present invention: using calcium phosphate nanoclusters as the precursor of the inorganic unit, successively adding sodium alginate aqueous solution and polyvinyl alcohol aqueous solution to form a uniform emulsion, and preparing the composite film by evaporation induced self-assembly method, A large number of hydrogen bonds and ionic bond forces are formed inside the film, thereby giving the composite film excellent mechanical properties.

[0029] The specific preparation method is as follows:

[0030] Prepare calcium phosphate nanoclusters: prepare an ethanol solution of calcium chloride, dissolve 11.76g calcium chloride dihydrate in 1.60L absolute ethanol, add 221.79mL triethylamine, stir for 30min, then add phosphoric acid ethanol solution (4.18 (mL phosphoric acid dissolved in 80mL ethanol), stirred vigorously for 12h, obtained a white precipitate by centrifugation, repeatedly wash...

Embodiment 2

[0035] First, take 6 portions of 10 mL with a concentration of about 30 mg mL -1 Place the calcium phosphate nanoclusters in a 50mL centrifuge tube, centrifuge at 8000rpm for 5min, discard the supernatant, add 10mL of 0.5wt% sodium alginate aqueous solution and shake well, then add 10mL of 3.0wt% polyvinyl alcohol aqueous solution , Oscillate uniformly, transfer to a 250mL beaker, stir vigorously for 3h, finally transfer the homogeneous emulsion to a 12cm×12cm petri dish after ultrasonic debubbling, dry at room temperature, and finally peel off from the petri dish to obtain a dried composite film. The prepared composite film also exhibits excellent toughness and reversible multi-color changes under a polarized light system.

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Abstract

The invention discloses a stress-responsive multi-color-change composite film material. The composite film comprises 50-90 wt% of organic matter and 10-50 wt% of calcium phosphate nanoclusters; and the organic matter comprises polyvinyl alcohol and sodium alginate, wherein a mass ratio of the polyvinyl alcohol to the sodium alginate is (3-9):1. The invention also discloses a method for preparing the stress-responsive multi-color-change composite film material. The method comprises the following steps: (1) using the calcium phosphate nanoclusters as an inorganic unit precursor, sequentially adding the sodium alginate aqueous solution and the polyvinyl alcohol aqueous solution, and preparing the isotropic composite film by an emulsion evaporation induced self-assembly process. The compositefilm provided by the invention exhibits excellent toughness, can be crimped and folded, and has higher mechanical bearing capacity and excellent elasticity; and the composite film has reversible and highly-sensitive color change in an orthogonal polarized light system, and can be used in optical devices, sensors or information storage materials.

Description

Technical field [0001] The invention relates to the technical field of functional film materials, in particular to a stress-responsive composite film with multiple color changes and a preparation method and application thereof. Background technique [0002] Anisotropic materials have become an important research hotspot in the field of materials science because of their unique mechanical and optical properties. In nature, animal bones and marine shells can resist axial compression, bending and stretching, all because of their special hierarchical structure. The colorfulness of butterfly wings and ocean shells and the discoloration behavior of chameleons also originate from the anisotropy of the structure, that is, they are all materials with a directional array of crystals. Under certain light, they will produce birefringence, light diffraction, and reflection. It turned out to be colorful in the end. Tough materials with both anisotropy and birefringence have great application...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L5/04C08L29/04C08K3/32C08J5/18G02F1/00G02F1/23
CPCC08J5/18C08J2305/04C08J2429/04C08K2003/325C08K2201/011G02F1/0063G02F1/23
Inventor 余亚东刘昭明唐睿康
Owner ZHEJIANG UNIV
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