291225 Formation and Characterization of an Inclusion Complex (IC) Between Poly (2-hydroxyethyl methacrylate) (PHEMA) and Gamma Cyclodextrin (γCD)
Non-covalently bonded crystalline inclusion complexes (ICs) have been formed by threading host cyclic starches, cyclodextrins (CDs) on to guest polymer chains. An IC between a PHEMA (polymeric guest) and a γCD (host) was previously unexplored. Solubility tests suggested using Methanol and DMSO solvents for dissolving the polymer and cyclodextrin respectively. PHEMA-γCD-IC obtained via a co-crystallization process was characterized using FTIR, DSC and WAXD techniques. FTIR spectrum of the IC indicates presence of both polymer and cyclodextrin. DSC thermogram of the IC confirms complete coverage of the polymer chains by γ-CD molecules while WAXD data indicates change in the crystal structure of γ-CD from cage to columnar structure which is typically observed in polymer-cyclodextrin complexes.
Having confirmed the formation of PHEMA-γCD-IC in the bulk the next step is to attempt formation of an IC with PHEMA chains grown on a silica chip and/or silica particles utilizing the same methodology. This nano-structuring process could potentially modify the surface properties of the PHEMA brushes through polymer chain alignment.