Preparation method of photoresponse unbraced film and application thereof

Abstract

The invention provides a preparation method of a photoresponse film, which comprises the following steps of: dissolving chitosan powder in an acetic acid aqueous solution, adding 4,4'-dihydroxyazobenzene dissolved in a strong polar solvent, fully stirring, removing visible bubbles in the solution, standing in a 5 DEG C environment under protection of nitrogen, uniformly pouring a clear solution into a mold, placing the mold in a constant-temperature oven to remove the solvent, taking out after 40 hours, forming the film, and washing the film with a sodium hydroxide aqueous solution to remove the film to obtain a photoresponse unbraced film. Compared with the prior art, the preparation method of the photoresponse film saves complex operation and cost in a preparation process of a polymer; and meanwhile, an azobenzene derivative is combined with chitosan molecules by hydrogen bonds, so that the molecular size change in a cis-trans isomerization process of the azobenzene is amplified, ultraviolet light irradiation is bent to a comparatively large extent, the bending is restored under the irradiation of visible light, and model design of photoinduced artificial muscle is achieved.

Description

technical field [0001] The invention relates to the technical fields of artificial intelligence and biomedicine, in particular to a preparation method of a light-responsive unsupported film and its application in artificial muscles. Background technique [0002] In recent years, with the development of basic science and the introduction of the concept of artificial intelligence, bionics has become a frontier and focus of natural science. Since the beginning of the 21st century, with the deepening of robot development and people's strong demand for intelligent mechanical systems, artificial muscles, which are the key to driving robots and intelligent mechanical systems, have become the focus of research in the field of bionics. Artificial muscle, as a driver, is a compound that is stimulated by the surrounding environment to produce a simple contraction function. It is not only suitable for biological treatment, but also can assist in the completion of material transfer under...

AI Technical Summary

Problems solved by technology

The material has the advantages of fast response, strong drive and good elasticity, but the material is an electrochemical drive, and its drive ability will be affected by various factors such as drive voltage and electrode material.

(4) Cross-linked liquid crystal polymers. Professor Yu Yanlei of Fudan University proposed for the first time that liquid crystal monomers containing azobenzene and diacrylate crosslinking agents were prepared into films by thermal polymerization. It was proved that by using linearly polarized light, azobenzene-containing Individual films of the liquid crystal network of chromophores can be bent along any chosen direction with selective volume shrinkage, but this thermal polymerization process is complex and results in a material with many defects that reduce its mechanical properties and lift weight Ability

[0005] However, the existing preparation materials for artificial muscles have the disadvantages of high production cost and complicated material preparation process, and are not suitable for large-scale production.

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