The melting behavior of physical blends prepared from low, medium, and high density polyethylene was examined by differential scanning calorimetry. Binary low/high and ternary low/medium/high density polyethylene blends showed two endothermic peaks which were attributed to the melting of the lower and higher density components. The percent crystallinity of the blends was calculated according to an additivity relationship using the crystallinity of the pure components. These results compared favorably with an experimental crystallinity measured from the area under the melting curves.
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Alfred A. Donatelli (1979) studied this question.