Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Liquid-Liquid Equilibria of Poly(4-vinylphenol)(PVPh)/Ethyl Acetate and PVPh/Butyl Acetate Solutions

Poly(4-vinylphenol)(PVPh)/Ethyl Acetate 및 PVPh/Butyl Acetate 용액계의 액-액 상평형

  • Kim, Mi Kyung (Department of Chemical Engineering, Kangwon National University) ;
  • Kim, Ki-Chang (Department of Chemical Engineering, Kangwon National University)
  • 김미경 (강원대학교 화학공학과) ;
  • 김기창 (강원대학교 화학공학과)
  • Received : 2005.09.02
  • Accepted : 2005.10.31
  • Published : 2005.12.31
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Abstract

Phase separations of Poly(4-vinylphenol)(PVPh)/Ethyl Acetate and PVPh/Butyl Acetate solutions were measured using the thermal optical analysis (TOA) method. The experimental phase separation data were correlated with liquid-liquid equilibria relations based on PC-SAFT equation of state. The phase separations of these system showed the behaviors of LCST (lower critical solution temperature)-type. The measured cloud temperatures were lowered with increasing in molecular weights of polymer(PVPh), and cloud temperatures of PVPh/Ethyl Acetate solutions shifted to lower temperature regions, compared to the PVPh/Butyl Acetate solutions. Extents of cross-association between solvent molecule and polymer in the PVPh/Ethyl Acetate solutions were measured using the FT-IR spectrum analysis method, and cross-association parameters of PC-SAFT model were estimated from experimental extents of cross-association. By using the estimated cross-association parameters between PVPh and solvent molecule, binodal and spinodal curves of liquid-liquid equilibria in PVPh/Ethyl Acetate and PVPh/Butyl Acetate solutions were calculated from PC-SAFT equation of state. The calculated binodal curves of these system were shown to be well agreeable with the experimental cloud temperature curves.

본 연구에서는 Poly(4-vinylphenol)(PVPh)/Ethyl Acetate 및 PVPh/Butyl Acetate 용액계의 액-액 상분리 거동을 TOA(thermal optical analysis)법으로 측정하고, 측정된 상분리 데이터를 PC-SAFT 상태방정식을 이용한 액-액 상평형 관계로 고찰하였다. 실험을 수행한 PVPh/Ethyl Acetate 및 PVPh/Butyl Acetate 용액계의 상분리 거동은 두 용액계 모두 LCST 형태의 거동을 보였고 상분리 온도는 고분자의 분자량이 증가함에 따라 낮아지는 경향을 보였으며 또한 용매의 분자량에 의한 영향으로는 용매의 분자량이 적은 PVPh/Ethyl Acetate 용액의 상분리 온도가 PVPh/Butyl Acetate 용액의 경우보다 낮은 온도 영역에 분포하는 경향을 보였다. 한편, PVPh/Ethyl Acetate 용액에서 PVPh와 용매 분자간의 수소결합에 의한 교차회합도를 FT-IR 스펙트럼 분석법으로 측정하고, 측정된 교차회합도로부터 PC-SAFT 모델의 교차회합 파라미터를 추산하였다. 추산된 교차회합 파라미터를 이용하여 PVPh/Ethyl Acetate 및 PVPh/Butyl Acetate 용액의 binodal curve와 spinodal curve를 계산하였으며, 계산된 binodal curve는 상분리 실험에서 측정된 상분리 온도(흐림온도) curve와 어느 정도 잘 일치하는 경향을 보였다.

Keywords

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