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Détermination des masses et des distributions moléculaires d'un poly(aryléthercétone‐ co ‐sulfone) semi‐cristallin (HTX) à l'aide d'une méthode de dérivatisation chimique, 2 . Chromatographie d'exclusion stérique du HTX sulfoné
Author(s) -
Daoust Daniel,
Godard Pierre,
Devaux Jacquex
Publication year - 1994
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.1994.021950131
Subject(s) - polymer chemistry , derivatization , chemistry , sulfone , solvent , polyelectrolyte , copolymer , methyl methacrylate , aryl , polymer , organic chemistry , high performance liquid chromatography , alkyl
HTX, a poly(aryletherketone‐ co ‐sulfone), is characterized by size exclusion chromatography (SEC) at room temperature. As HTX is not soluble in any solvent compatible with the SEC instrumentation, a derivatization procedure is applied in order to prepare a modified copolymer with improved solubility properties. This derivatization consists in a sulfonation by concentrated sulfuric acid. The derivative polymer is soluble in N ‐methyl‐2‐pyrrolidone (NMP), a classical SEC solvent. Sulfonated HTX (HTXS) is a polyelectrolyte. Consequently, a salt is added to NMP to perform reliable viscometric and SEC analyses. The SEC method is standardized with the establishment of the universal calibration with poly(methyl methacrylate) standards and the determination of the Mark‐Houwink‐Sakurada relationship of HTXS in NMP‐salt at 25°C. Finally, the reliability of the derivatization procedure and of the SEC method is confirmed by comparison with molecular masses from NMR.