Herstellung und Molmassencharakterisierung von poly[(dimethyliminio)ethylen(dimethyliminio)methylen‐1,4‐phenylenmethylen‐dichlorid]

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.