| 초록 |
Dispersion copolymerization of MMA and MA was carried out in a carbon dioxide medium with 2,2-azobisisobutyronitrile initiator at 353 K and 345 bar. To enhance the compatibility of the product copolymer to carbon dioxide, glycidyl methacrylate linked poly(dimethylsiloxane) reactive stabilizer was used. Regardless of the MA content in the feed (0, 5, 30, 60, 100 mol% MA), the copolymer products were obtained in high yield as a fine powder form. The copolymer yield decreased with increasing MA content in the feed. Changes in the copolymer composition versus the monomer composition in the feed were investigated using FT-IR and NMR data. The copolymer morphology such as the particle size and particle size distribution was characterized with scanning electron microscope. The molecular weight and molecular weight distribution of the copolymers were measured with gel permeation chromatography. The thermal properties of the copolymers were also measured using differential scanning calorimetry. |
