Title: Characterization of molar-mass and dilute-solution properties of poly(ether sulfone) with high glass-transition temperature
Authors: Maes, C ×
Godard, P
Daoust, D
Legras, Roger
Strazielle, C
Issue Date: May-1995
Publisher: Huthig & wepf verlag
Series Title: Macromolecular chemistry and physics vol:196 issue:5 pages:1523-1538
Abstract: Characterization of high-temperature poly(ether sulfone) (HTPES) molar mass was performed using light scattering, viscometry and size-exclusion chromatography (SEC). In pure N-methyl-2-pyrrolidone (NMP), a large increase of the reduced viscosity at low concentration was observed. By addition of a salt such LiBr, this effect was suppressed. Using the viscosity laws of HTPES and poly(methyl methacrylate) (PMMA) in NMP + LiBr the SEC method was standardized via the universal calibration established with PMMA standards. The Mark-Houwink-Sakurada (MHK) relationship for HTPES in NMP containing 0,1 mol/L LiBr at 25 degrees C with the intrinsic viscosity [eta] and molecular weight M afforded the MHK constants K = 33,8 . 10(-5) dL . mol(a) . g(1+a) and a = 0,70. The weight-average molar masses obtained from SEC were very close to those obtained from light scattering. A comparison of number-average molar masses obtained from H-1 NMR, potentiometric titration of chain-ends, and from SEC has shown more discrepancy for high molar masses. The study of dilute solution properties of HTPES macromolecules has shown the marked decrease of anisotropy with the number of repeating units, the low values of the characteristic ratio and of the Kuhn segment. All these conformational properties are similar to those of freely rotating chains.
ISSN: 1022-1352
Publication status: published
KU Leuven publication type: DI
Appears in Collections:Department of Materials Engineering - miscellaneous
× corresponding author

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