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Herstellung und Molmassencharakterisierung von poly[(dimethyliminio)ethylen(dimethyliminio)methylen‐1,4‐phenylenmethylen‐dichlorid]
Author(s) -
Beyer Peter,
Lechner M. Dieter,
Nordmeier Eckhard,
Mächtle Walter
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.1995.021960716
Subject(s) - molar mass , molar mass distribution , chemistry , polymer chemistry , analytical chemistry (journal) , xylylene , reactivity (psychology) , monomer , condensation polymer , polymer , organic chemistry , medicine , alternative medicine , pathology
The ionene poly[(dimethyliminio) ethylene(dimethyliminio) methylene‐1,4‐phenylenemethylene dichloride] was synthesized and characterized. Number‐, mass‐ and z‐average molar masses M n , M w and M z , and molar mass distribution were determined using equilibrium ultracentrifugation. With detection by means of Schlieren, interference, and UV optics. M w was additionally determined by static light scattering. All measurements yield within the experimental error the same value of M w viz. M w = 12,2 · 10 3 g/mol. This value agrees well with the value from an analysis of kinetical data, viz. M w = 11,4 · 10 3 g/mol. Molar mass distribution w ( M ) was determined from the concentration profile extrapolated to concentration γ 0 = 0; it is of a Wesslau‐type and relatively broad. The non‐uniformity U = M w / M n − 1 ≈ 3. According to the theory of polycondensation a Schulz‐Flory type of distribution should be obtained. A Schulz‐Flory distribution is not achieved because the monomers p ‐xylylene dichloride and N , N , N ′, N ′‐tetramethylethylenediamine exhibit higher reactivity in the initiation reaction than the homologs during chain propagation which results in a broader molar mass distribution than a Schulz‐Flory distribution.