In the current study, the role of milling time on thermal properties and crystallization behavior of medium density polyethylene (MDPE) was investigated. For this purpose, high energy ball mill and differential scanning calorimetry (DSC) techniques were used. The results of DSC tests indicated that the milling process affected on crystallization behavior and thermal properties of MDPE. Rising crystallization temperature, specific heat capacity and crystallinity index and decreasing Avrami index were caused by ball milling; yet melting temperature was not changed, even at long milling times. In summary, thermal properties of the polymer were not changed significantly by increasing milling time.

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