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Facile and Efficient Fabrication of Photoresponsive Microgels via Thiol–Michael Addition
Author(s) -
Zhang HuiJuan,
Xin Yan,
Yan Qiang,
Zhou LiLin,
Peng Liao,
Yuan JinYing
Publication year - 2012
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201200439
Subject(s) - ethylene glycol , azobenzene , polymer chemistry , michael reaction , click chemistry , peg ratio , covalent bond , materials science , thiol , acrylate , maleimide , polymer , photochemistry , chemistry , organic chemistry , copolymer , catalysis , finance , economics , composite material
A photoresponsive microgel is designed by the combination of a noncovalent assembly strategy with a covalent cross‐linking method. End‐functionalized poly(ethylene glycol) with azobenzene [(PEG‐(Azo) 2 )] was mixed with acrylate‐modified β ‐CD ( β ‐CD‐MAA) to form photoresponsive inclusion complex through host–guest interaction. The above photoresponsive complex was cross‐linked by thiol‐functionalized PEG (PEG‐dithiol) via Michael addition click reaction. The photoreversibility of resulted microgel was studied by TEM, UV–Vis spectroscopy, and 1 H NMR measurements. The characterization results indicated that the reversible size changes of the microgel could be achieved by alternative UV–Vis irradiations with good repeatability.