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Size exclusion behavior of polymers in amide solvents

II. Molecular weight determination of acrylonitrile polymers in N,N-dimethylformamide


Size exclusion chromatography (SEC) procedure for the determination of molecular weight and molecular weight distribution of acrylonitrile polymers (PAN) is described. The Mark-Houwink-Sakurada parameters of PAN polymers in DMF and 0.01M LiBr-DMF at 60°C were estimated. The values of a parameters obtained by us for PAN prepared both by persulfate-metabisulfite aqueous system (PAN), and azo-bis-isobutyronitrile in DMF solution (PAN-A) were the same, while for PAN sample containing small amounts of sulfonated pendant groups (PAN-S) was higher. The addition of inorganic salt, such as LiBr, to DMF suppressed the abnormal SEC elution behavior observed in the solvent without the electrolyte although SEC of PAN-A showed almost the same results as in DMF with electrolyte. The universal calibration using monodisperse poly(ethylene oxide) standards as well as application of the Mark-Houwink-Sakurada parameters were satisfactory for the determination of the molecular weights.

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Azuma, C., Dias, M.L. & Mano, E.B. Size exclusion behavior of polymers in amide solvents. Polymer Bulletin 34, 593–598 (1995).

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  • LiBr
  • Molecular Weight Distribution
  • Ethylene Oxide
  • Acrylonitrile
  • Inorganic Salt