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Language: English

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received May 18, 2001
Accepted July 2, 2001

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Monomer Concentration Effect on the Phase Behavior of Poly(propyl acrylate) and Poly(propyl methacrylate) with Supercritical CO2 and C2H4

Hun-Soo Byun Cheol Park^†

Department of Chemical Engineering, Yosu National University, Chonnam 550-749, Korea

Korean Journal of Chemical Engineering, January 2002, 19(1), 126-131(6), 10.1007/BF02706885

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Abstract

Experimental cloud-point data to temperature of 186 oC and pressure of ~2,500 bar are presented for ternary mixtures of poly(propyl acrylate)(PPA)-CO2-propyl acrylate (PA) PPA-C2H4-PA and poly(propyl methacrylate) (PPMA)-CO2-propyl methacrylate (PMA) systems. Cloud-point pressures of PPA-CO2-PA system were measured in the temperature range of 32 oC to 175 oC and to pressures as high as 2,070 bar with PA concentrations of 0.0, 5.0, 11.7 and 30.4 wt%. Adding 34.1 wt% PA to the PPA-CO2 mixture significantly changes the phase behavior. This_x000D_ system changes the pressure-temperature slope of the phase behavior curves from U-LCST region to LCST region as the PA concentration increases. Cloud-point data to 170 oC and 1,400 bar are presented for PPA-C2H4-PA mixtures and with PA concentration of 0.0, 5.7, 15.5 and 22.2 wt%. The cloud-point curve of PPA-C2H4 system shows relatively flat at 730 bar for temperatures between 41 and 150 oC. With 15.5 and 22.2 wt% PA the cloud-point curve exhibits a positive slope that extends to 35 oC and ~180 bar. Also, the ternary PPMA-CO2-PMA system was measured below 186 oC and 2,484 bar, and with cosolvent of 5.2-20.1 wt%. PPMA does not dissolve in pure CO2 to 233 oC and 2,500 bar. Also, when 41.5 wt% PMA is added to the PPMA-CO2 solution, the cloud-point curve shows the typical appearance of a lower critical solution temperature (LCST) boundary.

Keywords

Carbon Dioxide Ethylene Phase Behavior PPA-CO2-PA PPA-C2H4-PA PPMA-CO2-PMA Cosolvent

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