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Evaluation of the efficiency of polymer fractionation by the column elution method

✍ Scribed by A.L. Spatorico; B. Coulter

Publisher
Elsevier Science
Year
1973
Tongue
English
Weight
573 KB
Volume
79
Category
Article
ISSN
1873-3778

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✦ Synopsis

Three amorphous homopolymers

were fractionated by the column elutiontemperature gradient technique. The efficiency of the molecular-weight separations was determined by gel permeation chromatography. Three column-packing techniques were investigated. The most efficient method entailed preliminary bulk fractionation (four steps), and loading of the top fifth of the chromatographic column with the polymer-coated support. A cursory examination was made of the effect of sample size on column efficiency. Five grams of a POLA polyester (poly(4,4'-isopropylidenediphenylene-r ,~,~-trimetl~yl-~-pl~enylindan-~',~-dicarboxylate), a polystyrene, and a poly(methy1 methacrylate) were fractionated by this technique. By optimizing conditions, ten fractions of nearly equal weight were obtained for each polymer, most fractions being of narrow molecular-weight distribution, i.e., Ilf,/M, 1.15 f 0.10.

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