Effect of 110 keV electrons on the deformation mechanisms of low density polyethylene

Effect of 110 keV electrons on the deformation mechanisms of low density polyethylene
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110 keV电子对低密度聚乙烯变形机制的影响

DOI:
10.1016/j.polymdegradstab.2014.07.006
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发表时间:
2014-11
影响因子:
5.9
通讯作者:
Tian Feng
Tian Feng
中科院分区:
化学2区
文献类型:
--
作者:
Yang, Jianqun;Li, Xingji;Liu, Chaoming;Tian Feng

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根据低密度聚乙烯(LDPE)单轴拉伸变形过程中的变形行为和结构演变,探讨了不同注量的110keV电子辐照LDPE的变形机制。通过小角X射线散射(SAXS)和广角X射线衍射(WAXD)原位获得结构演化。结果表明,低注量的110keV电子改变了LDPE不同区域(应变硬化区、应变软化区、二次应变硬化区、应变软化区的平台区和二次应变硬化区的子阶段)的转变应变。110keV高注量电子使应变软化区消失,样品快速断裂。从SAXS和WAXD分析可知,110keV电子对原薄片的衰变和薄片的旋转没有影响,只是减慢了新晶体的形成。110keV电子产生的交联强化作用是导致LDPE形变行为发生变化的主要原因。
The deformation mechanisms of low density polyethylene (LDPE) irradiated by 110ákeV electrons with different fluences are discussed basing on the deformation behaviors and the structural evolution during uniaxial tensile deformation. The structural evolution is in-situ obtained from small angle X-ray scattering (SAXS) and wide angle X-ray diffraction (WAXD). It is found that the 110ákeV electrons with low fluence change the transition strains of different regions (strain-hardening region, strain-softening region, secondary strain-hardening region, plateau in the strain-softening region and sub-stages in the second strain-hardening region) for LDPE. The 110ákeV electrons with high fluence lead to disappearance of the strain-softening region and quick break of the samples. From SAXS and WAXD analyses, it is known that the 110ákeV electrons have no effect on the disintegration of the original lamellae and the rotation of the lamellae, only slow down the formation of the new crystals. It is concluded that the crosslinking strengthening generated by 110ákeV electrons is the dominant reason for the changes of the deformation behaviors of LDPE.
DOI: 10.1016/s0032-3861(97)00111-0
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