Facile and efficient fabrication of photoresponsive microgels via thiol-Michael addition.
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.
Key Lab of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, PR China.
Hui-Juan
HJ
Zhang
Yan
Y
Xin
Qiang
Q
Yan
Li-Lin
LL
Zhou
Liao
L
Peng
Jin-Ying
JY
Yuan
D001391:Azo Compounds / Q000737:chemistry; D005782:Gels / Q000737:chemistry*; D008027:Light; D011092:Polyethylene Glycols / Q000737:chemistry; D013438:Sulfhydryl Compounds / Q000737:chemistry*; D014466:Ultraviolet Rays; D047392:beta-Cyclodextrins / Q000737:chemistry
D001391:Azo Compounds; D005782:Gels; D013438:Sulfhydryl Compounds; D047392:beta-Cyclodextrins; D011092:Polyethylene Glycols; C009850:azobenzene; C031215:betadex