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A Study on photoisomerization of cellulose acetate containing disperse red 1

Disperse red 1을 함유하고 있는 셀룰로오스 아세테이트의 광이성화에 관한 연구

  • Lee, Soo (Dept. of Chemical Technology, Changwon National University) ;
  • Park, Keun-Ho (Dept. of Chemical Technology, Changwon National University) ;
  • Jung, Dong-Soon (Dept. of Chemical Technology, Changwon National University)
  • 이수 (창원대학교 공업화학과) ;
  • 박근호 (창원대학교 공업화학과) ;
  • 정동순 (창원대학교 공업화학과)
  • Published : 1999.12.31

Abstract

In order to study a reversible photoisomerization of disperse red l(DR 1) attached on natural polymers, cellulose acetate containing DR l(DR 1/CA adduct) was prepared, and the changes of UV/VIS spectra of its solution(benzene, DMAc). thick film, and LB film were investigated by alternate irradiation with two different wave length lights. DR 1/CA adduct was prepared through tosylation of partially hydrolyzed cellulose acetate followed by reaction with DR 1 at $100^{\circ}C$ in pyridine. From the UV/VIS spectra of DR 1/CA adduct dissolved in DMAc solvent including phosphoglyceride before and after irradiation at 360nm and 45Onm, we found out the changes of UV/VIS spectra were reversible. In addition, the change of UV/VIS spectra of this adduct solution was strongly depended on the sorts of solvents and temperature. As the temperature was increased, UV/VIS spectra of this adduct solution in DMF showed blue shift. These results provided this solution could be applied to a temperature sensor. In the thick film case, we also obtained similar results with solution case. LB monolayer and trilayer from DR 1/CA adduct was obtained by scattering the solution including phosphoglyceride on water surface at the surface pressure of 8mN/m. After irradiation on that LB monolayer and trilayer, the reversible photoisomerization was also detected. From these results we concluded DR 1/CA adduct was suitable for the application to data storage and optical switch, etc.

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