Abstract
Three amorphous homopolymer were fractioned by the column elution-temperature 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′-isopropylidene-diphenylene-1,1,3-trimethyl-3-phenylindan-4′,5-dicarboxylate), a polystyrene, and a poly(methyl 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., M w/M n 1.15 ± 0.10.
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