| Abstract
| - New hybrid polyoxazolines (CubePOZO) were synthesized by ring-opening polymerizationof 2-methyl-2-oxazoline initiated by functionalized polyhedral oligomeric silsesquioxane (POSS) withvarious feed ratios. The hybrid micelles derived from CubePOZO with both seven hydrophobic cyclopentylgroups of POSS and polyoxazoline (POZO) as a hydrophilic segment were prepared in an aqueous phase.Compared to POZO initiated by cyclohexyl iodide or methyl p-toluenesulfonate, increased hydrophobicitycaused by the structure of POSS in CubePOZO played a major role in the micelle formation. This dependedon the amount of POSS incorporated into the POZO. The CubePOZO100 and CubePOZO200 formedmicelles in an aqueous phase with critical micelle concentrations (cmc) of 55 and 100 mg/L, respectively.Transparent polymer hybrids, homogeneous dispersion of hydrophobic POSS bonded covalently to POZOin the silica gel matrix at the molecular level, were obtained through hydrogen-bonding interaction betweenCubePOZO and silica gel. The obtained polymer hybrids from CubePOZO showed excellent solventresistance, similar to that of polymer hybrids having an interpenetrating polymer network structure. Itwas concluded that the solvent-resistant property came from the size of POSS and the hydrophobicinteraction between the POSS in the silica gel matrix. In addition, thermal stability of the polymer hybridsfrom CubePOZO was much increased compared to that of the polymer hybrids from homoPOZO andPOSS.
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