| Abstract
| - Polymer−polymer interactions were investigated for mixtures of a poly(acrylic acid) (pAA) carrying azobenzene (pC12Azo) and two kinds of pAA carrying α-cyclodextrin (CD), in which CDs are attached to the main chain through the 3- and 6-positions in CD (p3αCD and p6αCD, respectively), using several techniques, such as viscosity and NMR measurements. Viscosity data exhibited contrast changes upon UV irradiation: thinning (p3αCD/pC12Azo) and thickening (p6αCD/pC12Azo). NOESY spectra confirmed that the contrast viscosity changes were ascribable to differences in how CD moieties interact with pC12Azo after photoisomerization of azobenzene moieties from trans to cis: dissociation of inclusion complexes (p3αCD/pC12Azo) and formation of interlocked complexes (p6αCD/pC12Azo).
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