engleski

Simple equipment for measurement of total pressure of polymer + solvent mixtures

This study belongs to a series of continuing studies of vapour–liquid equilibria (VLE) in diluted polymer + solvent systems. We investigated polystyrene (PS) + butan-2-one [1] or + toluene [2], poly(methyl methacrylate) + acetone [3] or + butan-2-one [4], poly(acrylic acid) + water [3], including earlier measurements of VLE in solutions of co- and terpolymers of octadecyl acrylate and octadecyl methacrylate with styrene and 1-vinyl-2-pyrrolidone [5], [6]. In this work, a new equipment designed for total pressure determination in mixtures where one of component is not volatile, such as polymer + solvent systems, is presented. It enables measurement of pressure above solutions within the temperature interval 30 – 160 oC and in wider concentration range. The equipment has been tested using data on known systems, and some preliminary results on VLE measurement for systems poly(ethylene glycol) + water, and poly(styrene) + toluene are presented. References [1] J. Pavlíček, G. Bogdanić, I. Wichterle, Ebulliometric Measurement of Total Pressure in the Binary Polystyrene + Butan-2-one system, Fluid Phase Equilib., in press. [2] J. Pavlíček, G. Bogdanić, I. Wichterle, Vapour–Liquid Equilibria in the Polystyrene + Toluene System at Higher Concentrations of Solvent, Chem. & Biochem. Eng. Q. 29 (2015) 1–4. [3] J. Pavlíček, G. Bogdanić, I. Wichterle, Vapour–Liquid Equilibria in the Polymer + Solvent System Containing Lower Concentrations of Solute at Normal or Reduced Pressures, Fluid Phase Equilib. 358 (2013) 301–303. [4] J. Pavlíček, G. Bogdanić, I. Wichterle, Vapour–Liquid Equilibria in the Poly(methyl methacrylate) + 2-Butanone System Containing Lower Concentrations of Solute at Normal or Reduced Pressures, Chem. Biochem. Eng. Q. 28 (2014) 447–450. [5] J. Pavlíček, G. Bogdanić, I. Wichterle, Circulation Micro-ebulliometer for Determination of Pressure above Mixtures Containing Solvent and Non-volatile Component, Fluid Phase Equilib. 297 (2010) 142–148. [6] G. Bogdanić, I. Wichterle, Vapor–Liquid Equilibrium in Diluted Polymer + Solvent Systems, J. Chem. Eng. Data 56 (2011) 1080–1083. Acknowledgements This study was partly supported by the Czech Science Foundation (Grant No. 15-19542S).

Vapor-liqiud eliquibria; polymer-solvent system; total pressure

This study was partly supported by the Czech Science Foundation (Grant No. 15-19542S).