Dispersion polymerization of styrene in supercritical CO2 stabilized by random copolymers of 1H,1H-perfluorooctyl methacrylate and 2-dimethylaminoethyl methacrylate |
| |
| Affiliation: | 1. Division of Image and Information Engineering, Pukyong National University, Busan 608-739, Republic of Korea;2. Kyung Il University, Gyeongsang buk-do 712-701, Republic of Korea;1. Innovation Center of Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11000 Belgrade, Serbia;2. Faculty of Technical Sciences, University of Kragujevac, 65 Svetog Save Street, 32000 Cacak, Serbia;3. Institute of Chemistry, Technology and Metallurgy, Centre of Excellence in Environmental Chemistry and Engineering, University of Belgrade, 12 Njegoseva Street, 11000 Belgrade, Serbia;4. Faculty of Technology and Metallurgy, University of Belgrade, 4 Karnegijeva Street, 11000 Belgrade, Serbia;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117586, Singapore;2. Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research, Singapore 138634, Singapore |
| |
| Abstract: | The dispersion polymerizations of styrene in supercritical CO2 employing random copolymers composed of 1,1-dihydroperfluorooctyl methacrylate (FOMA) and 2-dimethylaminoethyl methacrylate (DMAEMA) (poly(FOMA-co-DMAEMA)) as stabilizers were investigated with two different compositions. It was demonstrated that micron-sized, free-flowing, spherical polystyrene (PS) particles could be obtained in high yields by poly(FOMA-co-DMAEMA) containing as low as 50% (w/w) FOMA. Results indicate that DMAEMA units in the stabilizer, as an anchor group with its special characteristics, can be adsorbed on PS particles to provide an enough colloidal stability. The initial concentration of styrene and the stabilizer affected the molecular mass, polymerization yield, and the morphology of PS particles. The PS particles could be redispersed in buffered water (pH 2.1) by an ionic stabilization mechanism provided by DMAEMA units on the surface. Dynamic light scattering (DLS) measurements of aqueous latexes gave similar particle sizes as those from SEM analysis. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
