Abstract
Ring-opening polymerization of epoxidized soybean oil (ESO) catalyzed by a superacid, fluoroantimonic acid hexahydrate (HSbF6·6H2O) and the anhydrous form (HSbF6) in ethyl acetate was conducted in an effort to develop useful biodegradable polymers. The resulting polymerized ESO (SA-RPESO and SAA-RPESO) was characterized using infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis (TGA), 1H-NMR, 13C-NMR, solid-state 13C-NMR and gel permeation chromatography (GPC). The results indicated that ESO was effectively polymerized by fluoroantimonic acid and formed polymers with relatively high cross-link density. Glass transition temperatures of these polymers ranged from –13°C to –21°C. TGA results showed the SA-RPESO and SAA-RPESO polymers were thermally stable at temperatures up to 200°C. Decomposition of the polymers was found to occur at temperatures greater than 350°C. GPC results indicated the extracted soluble substances from SA-RPESO polymers were oligomers of ESO. These soybean oil–based polymers will be explored for application in the personal and health care areas.
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