Abstract
Polymerization of N-isopropylacrylamide (NIPAAm) was performed in the presence of β-cyclodextrin (β-CD) [or hydroxypropyl-β-cyclodextrin (HOP-β-CD)]. The formation of an inclusion complex between PNIPAAm and β-CD was confirmed by FT-IR, 1H NMR and 2D-NOESY NMR. It was found that the cloud point (CP) of poly(N-isopropylamide) (PNIPAAm) in the PNIPAAm/β-CD complex in aqueous solution increased up to about 57°C whereas that in the PNIPAAm/β-CD blend is about 33°C. The CP of PNIPAAm in the PNIPAAm/β-CD complex is higher than that in the PNIPAAm/HOP-β-CD inclusion complex. IR and NMR results suggest that PNIPAAm chains are included in CD cavities.
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