Nonisothermal crystallization kinetics and melting behavior of bimodal medium density polyethylene/low density polyethylene blends |
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| Authors: | Jun-gang Gao Mao-shang Yu |
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| Institution: | a Department of Polymer Science, College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China
b Department of Chemistry, Changshu College of Science and Technology, Changshu 215500, Jiangsu Province, China |
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| Abstract: | Nonisothermal crystallization kinetics and melting behavior of bimodal-medium-density- polyethylene (BMDPE) and the blends of BMDPE/LDPE were studied using differential scanning calorimetry (DSC) at various scanning rates. The Avrami analysis modified by Jeziorny and a method developed by Mo were employed to describe the nonisothermal crystallization process of BMDPE. The BMDPE DSC data were analyzed by the theory of Ozawa. Kinetic parameters such as the Avrami exponent (n), the kinetic crystallization rate constant (Zc), the peak temperatures (Tp) and the half-time of crystallization (t1/2) etc. were determined at various scanning rates. The appearance of double melting peaks and the double crystallization peaks in the heating and cooling DSC curves of BMDPE/LDPE blends indicated that the BMDPE and LDPE could crystallize respectively. |
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| Keywords: | Bimodal medium density polyethylene Low-density polyethylene Blends Nonisothermal crystallization kinetics |
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