Synthesis of cross-linked poly(methyl methacrylate) via dispersion polymerization in supercritical carbon dioxide |
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Authors: | Jungin Shin Won Bae Hwayong Kim |
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Affiliation: | (1) School of Chemical and Biological Engineering, Seoul National University, 599, Gwanangno, Gwanak-Gu, Seoul, 151-744, South Korea;(2) R&D Institute, Miwon Specialty Chemical Co., Ltd., 405-3, Moknae-dong, Ansan-si, Gyeonggi, 425-100, South Korea; |
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Abstract: | Cross-linked poly(methyl methacrylate) particles were prepared via dispersion polymerization in supercritical carbon dioxide (scCO2) using poly(heptadecafluorodecyl methacrylate) (PHDFDMA) and 2,2′-azobisisobutyronitrile as the dispersant and the initiator, respectively. The following chemicals were used as cross-linking agents: ethylene glycol dimethacrylate (EGDMA), 1,4-buthanediol di(meth)acrylate (1,4-BD(M)A), and trimethylolpropane trimethacrylate. PHDFDMA was synthesized by solution polymerization in scCO2. We investigated the effect of the chemical structure, concentration of the cross-linking agents, reaction pressure, and CO2 density on the morphology, the polydispersity, and the cross-linking density of polymer particles. The resulting polymer particle was characterized by field emission SEM, differential scanning calorimetry, and thermal gravimetric analysis. The cross-linked PMMA particles is more agglomerate as the cross-linking agent concentration increased and as pressure decreased at constant temperature. Glass-transition temperature (T g) of the resulting polymer increased as the cross-linking agent increased with temperature and pressure increasing at the same CO2 density. Decomposition temperature is slightly increased as 1,4-BDA concentration increased. From these results, we can confirm that the thermal stability of the polymer increased as the cross-linking agent and EGDMA is the best cross-linking agent in term of the thermal stability. |
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