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Fabrication of photochromic hydrogels using an interpenetrating chitosan network
Author(s) -
Lee Cheol Woo,
Lee Seung Hwan,
Yang YoungKeun,
Ryu GeunChang,
Kim HoJoong
Publication year - 2017
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.45120
Subject(s) - self healing hydrogels , photochromism , spiropyran , chitosan , merocyanine , polymer chemistry , interpenetrating polymer network , materials science , polymer , swelling , chemical engineering , chemistry , nanotechnology , composite material , organic chemistry , engineering
The synthesis of a novel interpenetrating chitosan network post‐modified with spiropyran (SP) derivatives has been used to develop photochromic hydrogels. We have synthesized succinyl chitosan polymers containing a considerable number of both amines and carboxylic groups. Their intra/inter molecular amide coupling reactions and postmodification with SP derivatives resulted in the photochromic hydrogels functionalized with chitosan‐based interpenetrating polymer network structures. In this hydrogel system, SPs undergo reversible photoresponsive structural switching between a ring‐closed colorless SP form and a ring‐opened purple merocyanine form under specific light‐irradiation conditions. Notably, the photo‐mediated wettabilities and color intensities of the hydrogels increase by the increment in the molecular weight of SP‐functionalized chitosans. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134 , 45120.