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Dispersion Polymerization of Acrylate Monomers in Supercritical $CO_2$ using GMA-functionalized Reactive Surfactant  

Park, Kyung-Kyu (Department of Chemical Engineering, Dong-A University)
Kang, Chang-Min (Department of Nano Engineering, Dong-A University)
Lee, Sang-Ho (Department of Chemical Engineering, Dong-A University)
Publication Information
Elastomers and Composites / v.45, no.4, 2010 , pp. 256-262 More about this Journal
Abstract
Dispersion polymerization of methyl acrylate, ethyl acrylate, butyl acrylate, and glycidyl methacrylate were performed in supercritical $CO_2$ at $80\;^{\circ}C$ and 346 bar. Glycidyl methacrylate linked poly(dimethylsiloxane) (GMS-PDMS) surfactant, which was prepared by linking glycidyl methacrylate to monoglycidyl ether terminated PDMS with amino-propyltriethoxysilane, was used as surfactant for the dispersion polymerization in $CO_2$. The yield of the poly(alkyl acrylate) polymers, synthesized in $CO_2$ medium, decreased as the alkyl tail of the acrylate monomers increased. Poly(glycidyl methacrylate) and poly(methyl acrylate) were produced in bead form whereas poly(ethyl acrylate) and poly(butyl acrylate) were viscous liquid. The poly(glycidyl methacrylate) particles had a number average diameter of 2.45 ${\mu}m$ and monodisperse distribution. The poly(methyl acrylate) had a number average diameter of 0.52 ${\mu}m$ and the particle size distribution was bimodal. The glass transition temperatures ($T_g$) of the poly(glycidyl methacrylate) and the poly(alkyl acrylate) products were 4~9 K higher than the $T_g$ of the corresponding acrylate polymers synthesized in conventional processes.
Keywords
Dispersion Polymerization; Supercritical $CO_2$; Macromonomer; Functionalized Reactive Surfactant;
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