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Effects of irradiation on the melting and crystallization behavior of ethylene polymers with different thermal history
Author(s) -
Teng Hongxiang,
Dong Wenfei,
Shi Yi,
Jin Xigao
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.11726
Subject(s) - linear low density polyethylene , materials science , crystallization , differential scanning calorimetry , polyethylene , irradiation , low density polyethylene , polymer , ethylene , polymer chemistry , calorimeter (particle physics) , melting point , composite material , chemical engineering , thermodynamics , chemistry , organic chemistry , catalysis , physics , electrical engineering , detector , nuclear physics , engineering
Ethylene polymers, including HDPE, Ziegler–Natta‐catalyzed LLDPE (Z–N LLDPE), metallocene‐catalyzed LLDPE (m‐LLDPE), and LDPE were thermally treated by different procedures, that is, quenching, slow cooling, and thermal segregation. These PE samples, having different thermal histories, were then irradiated with various doses, that is, 0, 13, 35, and 70 Mrad, by gamma ray using a 60 Co radiation source. The melting and crystallization behaviors of these irradiated samples were studied by a differential scanning calorimeter (DSC). The effects of the thermal histories and irradiation on the polymers were evaluated by their melting temperatures ( T m ), crystallization temperatures ( T c ), and heat enthalpies (Δ H ) in the heating and cooling scans. The results indicated that irradiation affects the samples having different thermal histories in different ways. The effects of the dosage on each kind of sample are discussed. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 536–544, 2003