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Nonisothermal crystallization kinetics of linear bimodal–polyethylene (LBPE) and LBPE/low‐density polyethylene blends
Author(s) -
Gao Jungang,
Yu Maoshang,
Li Yanfang,
Li Zhiting
Publication year - 2003
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.12464
Subject(s) - low density polyethylene , crystallization , materials science , polyethylene , linear low density polyethylene , kinetics , differential scanning calorimetry , polymer chemistry , avrami equation , thermodynamics , composite material , melting point , enthalpy of fusion , physics , quantum mechanics
Nonisothermal crystallization kinetics of linear bimodal–polyethylene (LBPE) and the blends of LBPE/low‐density polyethylene (LDPE) were studied using 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 LBPE and LBPE/LDPE blends. The theory of Ozawa was also used to analyze the LBPE DSC data. Kinetic parameters such as, for example, the Avrami exponent ( n ), the kinetic crystallization rate constant ( Z c ), the crystallization peak temperature ( T p ), and the half‐time of crystallization ( t 1/2 ) were determined at various scanning rates. The appearance of double melting peaks and double crystallization peaks in the heating and cooling DSC curves of LBPE/LDPE blends indicated that LBPE and LDPE could crystallize, respectively. As a result of these studies, the Z c of LBPE increases with the increase of cooling rates and the T p of LBPE for LBPE/LDPE blends first increases with increasing LBPE content in the blends and reaches its maximum, then decreases as the LBPE content further increases. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2431–2437, 2003