화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.20, No.3, 542-548, May, 2003
DOI10.1007/BF02705563  Export Citation
Solvent Power Dependence of Phase Behavior of Biodegradable Polymers in High-Pressure Hydrofluorocarbons
Byung-Chul Lee†
  • Department of Chemical Engineering, Hannam University, Daejeon 306-791, Korea
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Phase behavior data at temperatures from 30 ℃ to 100 ℃ and at pressures from 30 bar to 850 bar are presented for poly(D,L-lactide) in hydrofluorocarbon solvents: difluoromethane (HFC-32), trifluoromethane (HFC-23), and 1,1,1,2-tetrafluoroethane (HFC-134a). The cloud point pressures were measured by using a high-pressure equilibrium apparatus equipped with a variable-volume view cell, and were investigated as functions of temperature, polymer concentration, and polymer molecular weight. The solvent power of hydrofluorocarbon solvents of dissolving the poly(D,L-lactide) increased in the order HFC-23, HFC-32, and HFC-134a, in proportion to their dipole moments.
Keywords:Cloud Point;Biodegradable Polymer;Poly(D,L-lactide);Difluoromethane (HFC-32);Trifluoromethane (HFC-23);1,1,1,2-Tetrafluoroethane (HFC-134a)
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