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首页> 外文期刊>Journal of Applied Polymer Science >Effects of irradiation on the melting and crystallization behavior of ethylene polymers with different thermal history
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Effects of irradiation on the melting and crystallization behavior of ethylene polymers with different thermal history

机译：辐照对不同热历史乙烯聚合物熔融结晶行为的影响

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摘要

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 Co-60 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), crystallization temperatures (T-c), and heat enthalpies (DeltaH) 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. (C) 2003 Wiley Periodicals, Inc. [References: 21]
机译：乙烯聚合物，包括HDPE，齐格勒-纳塔催化的LLDPE（Z-N LLDPE），茂金属催化的LLDPE（m-LLDPE）和LDPE，通过不同的步骤进行热处理，即淬火，缓慢冷却和热分离。然后，使用Co-60辐射源通过伽马射线将具有不同热历史的这些PE样品分别以0、13、35和70 Mrad的各种剂量进行辐照。通过差示扫描量热仪（DSC）研究了这些辐照样品的熔融和结晶行为。通过加热和冷却扫描中的熔融温度（T），结晶温度（T-c）和热焓（DeltaH）来评估热历史和辐照对聚合物的影响。结果表明，辐照以不同的方式影响具有不同热历史的样品。讨论了剂量对每种样品的影响。 （C）2003 Wiley Periodicals，Inc. [参考：21]

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