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Continuous polymer fractionation of poly(methyl vinyl ether) and a new Kuhn‐Mark‐Houwink relation
Author(s) -
Petri HansMichael,
Stammer Andreas,
Wolf B. A.
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.1995.021960508
Subject(s) - fractionation , polymer , polymer chemistry , solvent , gel permeation chromatography , molar mass , ether , chemistry , permeation , chromatography , organic chemistry , membrane , biochemistry
Continuous polymer fractionation (CPF) — a new large‐scale method — was applied to the technical poly(methyl vinyl ether) (PVME) using toluence as solvent and petroleum ether as non‐solvent. Two different devices served as fractionation apparatus, namely a column packed with glass beads and a set of mixer‐settler extractors. Advantages and draw‐backs of these devices are discussed. The experiments yielded numerous PVME fractions, varying in molar mass from 22 to 87 kg/mol and in molecular non‐uniformity U = ( M¯ w / M̄ n ) – 1 from 0,25 to 0,41 according to gel‐permeation chromatography as compared with ca. U = 1,30 for the starting material. The following Kuhn‐Mark‐Houwink relation was established for PVME in ethyl methyl ketone at 30°C: [η]/(mL/g) = 2,6 . 10 −3 M̄ 0,86 .