Method for synthesizing visible-light response type azobenzene polymer

Abstract

The invention relates to a method for synthesizing a visible-light response type azobenzene polymer. The method comprises the following steps: preparing tetramethoxy dihydroxyazobenzene from 2,6-dimethoxyaniline and 3,5-dimethoxy phenol through diazo-reaction, reacting tetramethoxy dihydroxyazobenzene as a raw material with 6-bromohexane alcohol to prepare tetramethoxy-4-ethanol oxyl azobenzene, grafting azobenzene onto a polypropylene acyl chloride framework through alcoholysis reaction of acyl chloride groups, and converting unreacted acyl chloride groups into carboxyl through hydrolysis, thereby finally obtaining the visible-light response type azobenzene polymer, namely, a 2-(2,6,2',6'-tetramethoxy-4-hexyloxy azobenzene phenoxy) crylic acid ethyl ester acrylic copolymer. The method has the advantages that the method is simple and feasible, the synthesized polymer has visible-light response type azobenzene groups, trans / cis-form conversion is achieved under the radiation of green light (520nm), reverse conversion can be achieved under radiation of blue light (420nm), and compared with conventional azobenzene molecules, the azobenzene polymer has the most remarkable advantage that bidirectional conversion of isomer can be achieved without ultraviolet light.

Description

technical field [0001] The invention belongs to the field of organic polymer chemistry and provides a method for synthesizing visible light responsive azobenzene polymers. Background technique [0002] Azobenzene compounds, as a substance with good photosensitive properties, play an important role in the research of photoresponsive polymer materials. In recent years, domestic and foreign scientific research groups have mostly studied the preparation of photoresponsive azobenzene polymers by keying azobenzene chromophores into polymers. This type of polymer has great potential in optical information storage and biological applications. The great potential application value has aroused people's interest. [0003] The cis-trans isomerization reaction of azophenyl groups is the most concerned property of aromatic azo compounds, that is, the mutual conversion between cis and trans configurations. Studies have shown that the azo group is optically active, and it can undergo reve...

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Problems solved by technology

Studies have shown that the azo group is optically active, and it can undergo reversible trans- and cis-isomerization transformations under the condition of light or heating. Traditional azobenzene molecules need to be regulated by ultraviolet light, and ultraviolet light will It will cause certain damage to the biological environment. This shortcoming greatly limits the application of its molecules in biology, such as the reversible adsorption of self-assembled membranes to proteins, the release of micellar loaded drugs in organisms, etc.

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