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首页> 外文期刊>Journal of Applied Polymer Science >Structure Evolution During Uniaxial Tensile Deformation of High Density Polyethylene Before and After Irradiation by 1 MeV Electrons
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Structure Evolution During Uniaxial Tensile Deformation of High Density Polyethylene Before and After Irradiation by 1 MeV Electrons

机译：1 MeV电子辐照前后高密度聚乙烯单轴拉伸变形过程中的结构演变

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摘要

The structural evolution of high density polyethylene (HDPE) during uniaxial tensile deformation, before and after irradiation by 1 MeV electrons, is in situ studied by synchrotron small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD). Both the pristine and the irradiated HDPE exhibit three regions of deformation behavior. It is shown that the deformation in the first region is in accord with the change in long period of the lamellar structure. In the following two regions, both the straininduced melting and strain-induced crystallization could occur. The tensile stress decreases with strain in the second region due to the dominant melting effect. In the third region, the synergistic effect of the melting and crystallization results in stress leveling off first, and then the tensile stress increases again because the crystallization effect becomes dominant at higher strains. For the irradiated HDPE, the irradiation-induced crosslinking network slows down the deformation process. Compared to the pristine one, all the tensile stress is rather higher at a given strain for the irradiated HDPE.
机译：通过同步加速器小角X射线散射（SAXS）和广角X射线衍射（WAXD）原位研究了高密度聚乙烯（HDPE）在单轴拉伸变形过程中，在被1 MeV电子辐照之前和之后的结构演变。原始的和辐照的HDPE均表现出三个变形行为区域。结果表明，第一区域的变形与片状结构的长周期变化是一致的。在以下两个区域中，应变诱导的熔化和应变诱导的结晶都可能发生。由于主要的熔化效应，第二区域中的拉伸应力随应变而降低。在第三区域，熔化和结晶的协同作用首先导致应力趋于平稳，然后拉伸应力再次增加，因为在较高应变下结晶作用占主导。对于辐照的HDPE，辐照引起的交联网络减慢了变形过程。与原始的相比，在辐照的HDPE的给定应变下，所有拉伸应力都相当高。

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