Preparation and structures of supramolecules between cyclodextrins and polymers

摘要

Cyclodextrins (CDs) form inclusion complexes with various polymers with high selectivities to give crystalline compounds. α-CD formed complexes with poly(ethylene glycol) (PEG) and oligoethylene in high yields, although β-CD did not form complexes with PEG. However, β-CD formed complexes with poly(propylene glycol) (PPG). Although α-CD did not form complexes with polyisobutylene (PIB) and poly(methyl vinyl ether) (PMVE), γ-CD formed complexes with PIB and PMVE. There is a good correlation between the sectional areas of the polymers and the sizes of the CDs. The stoichiometries, properties, and structures of the complexes are discussed. The yield of the complexes increased with increasing molecular weight. Polyrotaxanes, in which many cyclodextrins are threaded on a poly(ethylene glycol) chain, were prepared by capping the chain- ends of the polymers in the complexes with bulky groups.