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Melt immiscibility in crosslinked polyethylene

Low density polyethylene crosslinked by decomposition of dicumyl peroxide shows evidence for two thases being present in the melt in a narrow temperature range just above the melting point. The effect has been studied in detail using differential scanning calorimetry, transmitted light intensity, and wide angle X-ray diffraction studies at 107 o C. It is believed that the effect is caused by the presence of relatively low molecular weight molecules which remain as an extractable fraction after crosslinking