Inclusion Complexation between Comblike PEO Grafted Polymers and α-Cyclodextrin

Abstract

The inclusion complexation of comblike poly(ethylene oxide) grafted polymers, P(PEOMA)s, with α-cyclodextrin (α-CD) was studied. The grafted polymers were prepared by atom transfer radical polymerization (ATRP) of the macromonomers containing poly(ethylene oxide) (PEOMA) of different molecular weights (Mn = 300, 475, and 1100). The grafted polymers that were made from the macromonomers of Mn 1100 and Mn 475 formed crystalline inclusion complexes (ICs) with α-CD, while the P(PEOMA) from the PEOMA of molecular weight Mn 300 failed to form ICs with α-CD. Furthermore, when the side chain length of the grafted polymers decreased, the time to form inclusion complexation with α-CD extended as well as the yields of the inclusion complexes ICs decreased significantly. X-ray diffraction (XRD) data indicated that the obtained ICs have a channel-type crystalline structure. The formation of ICs was further confirmed by differential scanning calorimetry (DSC) and 13C CP/MAS NMR analysis. The stoichiometry determined by...