Abstract
Azobenzene end-functionalized telechelic POx (Az-POx-Az) was designed for as multimodal stimuli-responsive polymer. Az-POx-Az (0.25 g/L) in physiological saline (150 mM NaCl) phosphate buffered solution (10 mM PBS, pH 7.4) exhibited fully reversible trans–cis photoisomerism upon alternate irradiation with 365 and 254 nm UV light. The photoisomerization of the azobenzene moieties influenced the lower critical solution temperature (LCST), and the cis form exhibited a slightly higher LCST than the trans form. Circular dichroism measurements of Az-POx-Az with cyclodextrins (CDs) exhibited induced circular dichroism at the absorption band of the azobenzene moiety, indicating the formation of host–guest complexes between the azobenzene moieties in Az-POx-Az and the CDs. After formation of host–guest complexes consisting of the azobenzene moieties and the CDs, Az-POx-Az exhibited increased LCSTs. Interestingly, the LCSTs of Az-POx-Az with α-CD and β-CD moved in opposite directions upon photoisomerization. By the...
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