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Precipitation polymerization of acrylic acid in compressed carbon dioxide–cosolvent systems
Author(s) -
Xu Qun,
Han Buxing,
Yan Haike
Publication year - 2003
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.11908
Subject(s) - miscibility , acrylic acid , differential scanning calorimetry , acetic acid , carbon dioxide , chemical engineering , polymerization , chemistry , polymer chemistry , scanning electron microscope , tetrahydrofuran , precipitation , materials science , organic chemistry , composite material , polymer , thermodynamics , solvent , copolymer , physics , engineering , meteorology
Precipitation polymerizations of acrylic acid (AA) in compressed carbon dioxide (65 bar) with different cosolvents, acetic acid, ethanol, and tetrahydrofuran, were studied. Analyses by viscosity measurement and differential scanning calorimetry indicate that the cosolvents have a pronounced effect on the properties of the product. Scanning electron microscopy shows that the products progress from microparticles to bicontinuous networks to fibers with the change of cosolvents and reaction conditions. Measurement of the volume expansion (Δ V %) of the liquid phase containing different cosolvents indicates that the miscibility of compressed CO 2 with the liquid phase is dependent on the cosolvent. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1876–1880, 2003