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Predicting the effect of dissolved carbon dioxide on the glass transition temperature of poly(acrylic acid)
Author(s) -
Cao GuiPing,
Liu Tao,
Roberts George W.
Publication year - 2009
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/app.31278
Subject(s) - acrylic acid , glass transition , supercritical fluid , materials science , supercritical carbon dioxide , polymer chemistry , thermodynamics , polymer , equation of state , carbon dioxide , sorption , solubility , polymerization , analytical chemistry (journal) , chemistry , chromatography , organic chemistry , monomer , composite material , physics , adsorption
The morphology and size of poly(acrylic acid) (PAA) particles produced by precipitation polymerization in supercritical CO 2 (scCO 2 ) depends on the glass transition temperature ( T g ) of the polymer at reaction conditions. In this study, the use of the Sanchez–Lacombe equation of state (SL‐EOS), in conjunction with Chow's equation, to predict the effect of CO 2 pressure on the T g of PAA was evaluated. Characteristic parameters for PAA were determined by fitting density data. Characteristic parameters for CO 2 were determined by fitting density data in the supercritical region. When the SL‐EOS was used in a purely predictive mode, with a binary interaction parameter (ψ) of 1, the solubility of CO 2 in PAA was underestimated and T g was overestimated, although the trend of T g with CO 2 pressure was captured. When was determined by fitting the SL‐EOS to the measured sorption of scCO 2 in PAA, the calculated T g 's agreed very well with measured values. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010
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