Changes in Fold Structure with Annealing in Polyethylene

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Abstract
During the annealing of quenched linear polyethylene, the ratio of the absorbance of the 1304 cm−1 band to the absorbance of the 1350 cm−1 band decreases toward the value found in single crystals and has the wrong annealing temperature dependence. Since this process takes place too slowly to be a recrystallization from the melt, this change must reflect a transformation of loose-loop type folds to the more regular type as found in single crystals. Slowly cooled samples have the same ratios as single crystals and do not change upon annealing.