The rate control of ring closure reaction of photochromic chalcone-epoxy doped with spiropyran dye was achieved successfully by virtue of [2π + 2π] photo-cycloaddition between the chalcone units of host polymer and photopolymerization of epoxy group at the chain ends, which is expected to control the free volume surrounding photochromic moiety. The kinetic measurement was conducted to prove the improved photostability of the merocyanine chromophore that is colored species of spiropyran. The chalcone-epoxy polymer system that contains chalcone group in the repeating unit of the main chain was proved to retard ring closure reaction of merocyanine significantly by the effective steric hindrance after UV irradiation than that of methacrylate polymer containing chalcone in the side chain.
Bibliographical noteFunding Information:
This research was supported by a grant (M1-02-KR-01-0001-02-K18-01-018-1-0) from Information Display R&D Center, one of the 21st Century Frontier R&D Program funded by the Ministry of Science and Technology of Korean government. Dr. Jae Hong Kim particularly acknowledges the financial support from Samsung Electronic Co. Ltd (2002). *Corresponding author. E-mail: email@example.com
- Photochromic behavior
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics