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Temperature-, Light-, and Host-moleculeresponsive Polymers with UCST Behavior for Aqueous Sensing Applications
作者:Chuanzhuang Zhao, Jianlei Lu, X. X. Zhu
关键字:UCST polymer, thermo-responsive, light-responsive, azobenzene, host-guest interaction.
论文来源:期刊
具体来源:ACS Applied Polymer Materials
发表时间:2019年

A light-sensitive moiety, azobenzene, is incorporated into polyacrylamide (PAM) to yield

copolymers with upper critical solution temperatures (UCST) in aqueous solutions. The

thermoresponsivness of the copolymers can be tuned not only by light-irradiation which causes

the transition between the trans- and cis-forms of the azobenzene, and but also by addition of αcyclodextrin (α-CD) which preferentially complexes with the trans-form of azobenzene. The

UCST transition is a combined effect of hydrogen-bonding between the amide groups of the PAM

chains and the hydrophobic interaction between azobenzene units, the latter of which can be

influenced by the photo-isomerization of azobenzene and the host-guest interaction between

azobenzene and α-CD. The strategy of incorporating switchable-hydrophobicity may inspire

designs of UCST polymers, which may have potential applications as drug delivery devices and

catalyst carriers.