Formation and Characterization of Inclusion Complexes of Poly(butylene succinate) with α- and γ-Cyclodextrins

The inclusion complexes (ICs) of α‐ and γ‐cyclodextrins (CDs) with high‐molecular‐weight poly(butylene succinate) (PBS) were prepared and characterized by differential scanning calorimetry, Fourier‐transform infrared spectroscopy (FT‐IR), wide‐angle X‐ray diffraction, solid‐state 13C nuclear magnetic resonance (NMR) spectroscopy, and solution 1H NMR spectroscopy. The resultant ICs were found to have channel structures. FT‐IR data suggested that the ICs were stabilized by hydrogen bonds between the host CD molecules and the guest PBS chains. Through the formation of ICs, the PBS chain possibly adopts the kink conformation in the included state, as indicated by NMR analysis. Experimental and curve‐fitting FT‐IR spectrum of α‐CD‐PBS IC in the carbonyl region (s, νCO).