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Responsive Azobenzene-Containing Polymers and Gels

Author(s)
Deshmukh, Smeet; Bromberg, Lev; Hatton, T. Alan
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Abstract
The photoviscosity effect in aqueous solutions of novel poly(4-methacryloyloxyazobenzene-co-N,N-dimethyl acrylamide) (MOAB-DMA) was demonstrated. The observed significant reduction in the zero-shear viscosity upon UV-irradiation of MOAB-DMA aqueous solutions was due to the dissociation of the interchain azobenzene aggregates. Such phenomena can be advantageously used in photoswitchable fluidic devices and in protein separation. Introduction of enzymatically degradable azo cross-links into Pluronic-PAA microgels allowed for control of swelling due to degradation of the cross-links by azoreductases from the rat intestinal cecum. Dynamic changes in the cross-link density of stimuli-responsive microgels enable novel opportunities for the control of gel swelling, of importance for drug delivery and microgel sensoric applications.
Date issued
2005-01
URI
http://hdl.handle.net/1721.1/7490
Series/Report no.
Molecular Engineering of Biological and Chemical Systems (MEBCS);
Keywords
Responsive gels, trans-4-methacryloyloxy azobenzene, 4,4’-di(methacryloylamino) azobenzene, cis-trans transitions, UV irradiation

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