Synthesis of organic-inorganic polymer hybrids by means of host-guest interaction utilizing cyclodextrin

Organic-inorganic polymer hybrids were synthesized utilizing the host-guest interaction. Cyclodextrins (CDs, alpha-, beta-, gamma-CD) could be dispersed in the silica gel matrix at a nanometer level because of the hydrogen-bonding interaction between hydroxyl moieties of CD and residual silanol groups of silica gel. It is known that beta-CD forms a strong host-guest complex with 1-adamantanol in an aqueous solution. Thus, the organic polymer modified with an adamantane group at the side chain (ADA-PAA) and silica gel hybrids could be prepared by complexation of beta-CD with ADA-PAA. beta-CD played a role as a compatibilizer between ADA-PAA and silica gel to obtain transparent and homogeneous polymer hybrids. The evidence of the host-guest complex formation was confirmed by a fluorescence technique using a dansyl group. Furthermore, transparent and homogeneous CD-polymer complex/silica gel hybrids were prepared utilizing CDs formed polyrotaxane-type inclusion complexes with polymers, such as poly(ethylene glycol) and polyisobutylene.