Abstract
A polyrotaxane in which many β-cyclodextrins (β-CyDs) are threaded onto a triblock copolymer of poly(ethylene glycol) (PEG) and poly(propylene glycol) (PPG) capped with fluorescein-4-isothiocyanate (FITC) was synthesized as a model of stimuli-responsive molecular assemblies for nanoscale devices. β-CyDs threaded onto the triblock copolymer enhance the solubility of the polyrotaxane and presumably contribute to the prevention of aggregation between PPG segments. The interaction of β-CyDs with a terminal FITC moiety was observed to be significant at 10°C, however, with increasing temperature, the interaction of β-CyDs with a PPG segment becomes prominent. From these results, it is concluded that the majority of β-CyDs move toward the PPG segment with increasing temperature although some β-CyDs may reside on PEG segments.
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