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Characterization of molar mass and dilute solution properties of poly(ether sulfone) with high glass transition temperature
Author(s) -
Maes Christian,
Godard Pierre,
Daoust Daniel,
Legras Roger,
Strazielle Claude
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960514
Subject(s) - molar mass , intrinsic viscosity , viscometer , chemistry , glass transition , polymer chemistry , ether , virial coefficient , molar mass distribution , sulfone , methyl methacrylate , gel permeation chromatography , viscosity , macromolecule , analytical chemistry (journal) , polymer , chromatography , materials science , organic chemistry , monomer , thermodynamics , physics , composite material , biochemistry
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°C with the intrinsic viscosity [η] 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 1 H 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.