Solubility and diffusivity of carbon dioxide in St-MMA copolymers

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• 作者：Hamid Reza Azimi ; Mostafa Rezaei ; ^{rezaei@sut.ac.ir}
• 关键词：St-MMA copolymer ; Solubility ; Diffusivity ; CO2 ; MSB
• 刊名：Journal of Chemical Thermodynamics
• 出版年：2013
• 出版时间：March, 2013
• 年：2013
• 卷：58
• 期：Complete
• 页码：279-287
• 全文大小：723 K

文摘

The present study focuses on synthesizing styrene-methylmethacrylate (St-MMA) copolymer particles in a batch reactor using suspension polymerization process at different copolymer compositions. Also for further comparisons, the neat polystyrene (PS) and polymethyl methacrylate (PMMA) were synthesized by the same method. The solubility and diffusivity of supercritical carbon dioxide (scCO₂) into the synthesized copolymers at two temperatures (393 and 423) K and pressures in the range from (5 to 12) MPa were measured by a magnetic suspension balance. The Sanchez-Lacombe (SL) equation of state was used to estimate the swelling effect of CO₂ on copolymers. The results showed that the solubility and diffusivity of CO₂ increased with increasing of CO₂ pressure and slightly improved with methyl methacrylate (MMA) content in copolymer. As well as the solubility of CO₂ in samples decreased with temperature increment and contrary behavior was observed for diffusivity. Fujita, Maeda and Paul¡¯s diffusion models were combined to estimate the diffusion coefficients for the copolymers and neat polymers.