PREPARATION AND CHARACTERIZATION OF THE MOLAR-MASS OF POLY[(DIMETHYLIMINIO)ETHYLENE(DIMETHYLIMINIO)METHYLENE 1,4-PHENYLENEMETHYLENE DICHLORIDE]

Autor(en): BEYER, P
LECHNER, MD
NORDMEIER, E
MACHTLE, W
Stichwörter: Polymer Science; ULTRACENTRIFUGE
Erscheinungsdatum: 1995
Herausgeber: HUTHIG & WEPF VERLAG
Journal: MACROMOLECULAR CHEMISTRY AND PHYSICS
Volumen: 196
Ausgabe: 7
Startseite: 2277
Seitenende: 2287
Zusammenfassung: 
The ionene poly[(dimethyliminio)ethylene(dimethyliminio)methylene-1,4-phenyleneme thylene dichloride] was synthesized and characterized. Number-, mass- and z-average molar masses ($) over bar M(n), ($) over bar M(w) and ($) over bar M(z), and molar mass distribution were determined using equilibrium ultracentrifugation. With detection by means of Schlieren, interference, and UV optics. ($) over bar M(w) was additionally determined by static light scattering. All measurements yield within the experimental error the same value of ($) over bar M(w), viz, ($) over bar M(w) = 12,2 . 10(3) g/mol. This value agrees well with the value from an analysis of kinetical data, viz. ($) over bar M(w) = 11,4 . 10(3) g/mol. Molar mass distribution w(M) was determined from the concentration profile extrapolated to concentration gamma(0) = 0; it is of a Wesslau-type and relatively broad. The non-uniformity U = ($) over bar M(w)/($) over bar M(n) - 1 approximate to 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.
ISSN: 10221352
DOI: 10.1002/macp.1995.021960716

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