β-Cyclodextrin (β-CD) and γ-cyclodextrin (γ-CD) formed inclusion complexes with polyisobutylene (PIB) of various molecular weights to give stoichiometric compounds in crystalline states. R-Cyclodextrin (R-CD) did not form complexes with PIB of any molecular weight. The yields of the complexes with β-CD decreased with an increase in the molecular weight of PIB. In contrast, the yields of the complexes with γ-CD increased with an increase in the molecular weight and the complexes were obtained almost quantitatively with PIB of molecular weight 1350. The chain-length selectivity is reversed between β-CD and γ-CD. The inclusion complexes were isolated and found to be 3:1 (monomer unit:CD). The complexes were characterized by IR, 1 H NMR, 13 C NMR, 13 C CP/MAS NMR, 13 C PST/MAS NMR spectra, and X-ray (powder), thermal, and elemental analyses. The structures of the complexes are discussed.

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Cyclodextrins (CDs) have been found to form inclusion complexes with Triton X in a site-selective manner; α-CD binds an ethylene glycol chain specifically and β-CD binds a hydrophobic end group (an iso-octylphenyl group and a phenyl group) specifically.