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Continuous fractionation of poly[(dimethylimino)decamethylene bromide] and molecular weight dependence of the glass transition
Author(s) -
Schultes Klaus,
Wolf B. A.,
Meyer Wolfgang H.,
Wegner Gerhard
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.1995.021960403
Subject(s) - glass transition , chemistry , molar mass , differential scanning calorimetry , diisopropyl ether , viscometer , bromide , gel permeation chromatography , ether , solvent , polymer chemistry , aqueous solution , molar mass distribution , fractionation , chromatography , analytical chemistry (journal) , viscosity , polymer , organic chemistry , materials science , physics , composite material , thermodynamics
30 g of the ionene poly[(dimethylimino)decamethylene bromide] were fractionated by a continuous counter‐current extraction method (CPF) using ethylene glycol monoethyl ether as the solvent and diisopropyl ether as the non‐solvent component. The efficiency of the separation was checked by viscometry and gel‐permeation chromatography (GPC) measurements. Eight fractions of different molar mass were prepared for differential scanning calorimetry (DSC) experiments. With bromide as counter‐ion, the glass transition temperature of the ionene increases from ca. 60 to 85°C as the intrinsic viscosity of this material (in 0,4 M aqueous solutions of KBr at 25°C) rises from ca. 14 to 22 mL/g. When bromide is replaced by tetrafluoroborate, the glass transition temperature remains almost constant at ca. 60°C, irrespective of the molar mass of the ionene.