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Photoresponsive polymer microsphere system and preparation method thereof

A polymer and light-responsive technology, applied in the field of intelligent polymer materials (responsive polymer materials), can solve the problems of difficult and precise control of the proportion and properties of the hydrophobic part of polymers, irreversible response behavior, high energy, etc., to achieve rapid and reliable Significant changes in light control and light transmission, reversible formation and disintegration, and mild preparation conditions

Inactive Publication Date: 2013-10-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the first type of photoresponsive microspheres is not easy to precisely control the proportion and properties of the hydrophobic part of the polymer, so the disintegration of the microspheres under ultraviolet light is often not complete enough, and the response is not effective enough.
Although the second type of light-responsive microspheres respond completely, their response behavior is irreversible. Once the microspheres disintegrate, they cannot be regenerated. At the same time, the covalent bonds need to be destroyed to detach the hydrophobic part from the main chain by light, which requires high energy and energy. For a long time, this will undoubtedly limit the application range of light-controlled microspheres and increase their preparation costs

Method used

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  • Photoresponsive polymer microsphere system and preparation method thereof
  • Photoresponsive polymer microsphere system and preparation method thereof
  • Photoresponsive polymer microsphere system and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Dissolve the sodium alginate-tetradecyltrimethylammonium bromide complex in the MES solution (concentration of 5%) and stir for 30 minutes to obtain the polymer to form microspheres. Then adjust the pH of the liquid to 14, add α-cyclodextrin (concentration of 5%), and then add monocarboxyazobenzene (concentration of 1.25%) to the system to obtain a polyelectrolyte with UV-visible light response Microspheres. The structure and size of the polymer microspheres are as attached figure 2 Shown in the scanning microscope photo.

[0025] Response to UV-Visible light: When the resulting microsphere system was placed under a 500W UV lamp for 10 minutes, the light transmittance of the system rose from 65% to 95%, indicating that the microspheres in the system collapsed. When placed again under a 500W incandescent lamp for 10 minutes, the light transmittance of the system dropped from 95% to 55%, indicating that microspheres were regenerated. As attached image 3 As shown, the pr...

Embodiment 2

[0027] Polyacrylic acid grafted with dodecyl group (grafting rate 15%) was dissolved in water to prepare an aqueous solution with a concentration of 1.5%, and stirred for 3 hours to form microspheres. Then add hydroxypropyl β-cyclodextrin (concentration 1%), stir to dissolve. Then add dicarboxyazobenzene (concentration of 0.125%) to the system to obtain polyelectrolyte microspheres with UV-visible light response.

[0028] Response to ultraviolet-visible light: When the obtained microsphere system is placed under a 200W ultraviolet lamp for 1 hour and minutes, the light transmittance of the system rises from 50% to 90%, indicating that the microspheres in the system collapse. When placed under a 200W incandescent lamp for 1 hour and minutes, the light transmittance of the system dropped from 90% to 60%, indicating that microspheres were regenerated. This process of disintegration and formation of microspheres can be repeated many times with changes in ultraviolet-visible light.

Embodiment 3

[0030] Dissolve the polylysine grafted with tetradecyl group in an aqueous solution (sodium alginate concentration is 0.5%) and stir for 3 hours to form microspheres. Then adjust the pH of the above liquid to 4, add α-cyclodextrin (concentration 3%), and stir to dissolve it. Then add monohydroxy azobenzene (concentration of 0.75%) to the system to obtain polyelectrolyte microspheres with UV-visible light response.

[0031] Response to ultraviolet-visible light: When the obtained microsphere system was placed under a 600W ultraviolet lamp for 10 minutes, the light transmittance of the system rose from 40% to 79%, indicating that the microspheres in the system collapsed. When placed under a 200W incandescent lamp for 1 hour and minutes, the light transmittance of the system dropped from 79% to 47%, indicating that microspheres were regenerated. This process of disintegration and formation of microspheres can be repeated many times with changes in ultraviolet-visible light.

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Abstract

The invention discloses a photoresponsive polymer microsphere system and a preparation method thereof. The system is a solution containing cyclodextrin, an azo compound having cis-trans isomerism respectively under the irradiation of ultraviolet light and visible light, and amphiphilic polyelectrolyte containing a hydrophobic alkyl chain. Polymer microspheres are generated when the system is under the irradiation of visible light, and the polymer microspheres in the system are decomposed under the irradiation of ultraviolet light. The preparation method comprises the following steps of: dissolving the amphiphilic polyelectrolyte in a solvent; completely stirring a microsphere solution; and then adding cyclodextrin and stirring for dissolving cyclodextrin; and finally adding the azo compound to obtain the photoresponsive polymer microsphere system after the azo compound is dissolved. The photoresponsive polymer microsphere system provided by the invention has the characteristics that the preparation conditions are moderate, the formation and decomposition of microspheres are reversible, quick and controllable. The photoresponsive polymer microsphere system has a bright application prospect in the biomedicine field such as medicine transfer, medicine slow release and the like, as well the anti-counterfeiting filed relating to trademarks, bills, even military industry, national defense and the like.

Description

Technical field [0001] The present invention relates to the field of smart polymer materials (responsive polymer materials), in particular to a responsive polymer microsphere with potential application value in the fields of surfactants, biomedicine, confidential transmission, trademarks, banknotes, etc. System materials and implementation methods. Background technique [0002] In recent years, polymer microspheres, especially those formed by self-assembly of amphiphilic (hydrophobic and hydrophilic) polymers, have attracted great research interest. Compared with the microspheres formed by low molecular weight surfactants, the amphiphilic polymer microspheres have the advantages of lower critical microsphere concentration and more stable thermodynamics (Supramol. Sci., 1996, 3, 157-163; Langmuir, 2002) , 18, 3780-3786; Biomacromoles, 2005, 6, 1154-1158.). Therefore, it has broad application prospects in the fields of bioengineering and biomedicine (such as controlled release of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L5/16C08L79/02C08K5/23C08J3/28
Inventor 张晟董振强李帮经
Owner SICHUAN UNIV
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