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High‐pressure viscosity of polystyrene solutions in toluene + carbon dioxide binary mixtures
Author(s) -
Yeo SangDo,
Kiran Erdogan
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000110)75:2<306::aid-app13>3.0.co;2-s
Subject(s) - polystyrene , carbon dioxide , viscometer , viscosity , polymer , toluene , reduced viscosity , relative viscosity , chemistry , materials science , analytical chemistry (journal) , polymer chemistry , chemical engineering , chromatography , organic chemistry , composite material , engineering
High‐pressure viscosity of polystyrene ( M w = 50,000, M w / M n ≤ 1.06) solutions in toluene and in mixtures of toluene + carbon dioxide was measured using a falling cylinder‐type viscometer at 320, 340, and 360 K, and up to 35 MPa. Solutions with polystyrene concentrations of 3, 5, and 7 wt % were investigated. Carbon dioxide levels in the range from 0 to 14.7 wt % were evaluated. Viscosity was observed to vary linearly with pressure at the temperatures and polymer concentrations investigated. Viscosity of the polymer solutions decreased as the concentration of carbon dioxide in the mixture was increased. The largest viscosity reduction was observed at the lowest temperature and at the highest concentration of polymer. The viscosity of the solutions was correlated with the solution density for different compositions. It was found that solutions of the same density have different viscosities, depending upon the carbon dioxide concentration in the mixture. The solutions with the higher carbon dioxide content display the lower viscosities at a given density. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 306–315, 2000