Time resolved simultaneous small- and wide-angle X-ray scattering during polyethylene deformation: 1. Cold drawing of ethylene-α-olefin copolymers
Time resolved simultaneous small- and wide-angle X-ray scattering during polyethylene deformation: 1. Cold drawing of ethylene-α-olefin copolymers
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DOI：
10.1016/s0032-3861(97)00111-0
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发表时间：
1997-10
期刊：
影响因子：
4.6
通讯作者：
M. F. Butler;A. Donald;A. Ryan
中科院分区：
文献类型：
--
作者：
M. F. Butler;A. Donald;A. Ryan
采用同时进行的小角和广角X射线散射（SAXS和WAXS）技术研究了一系列聚乙烯共聚物在变形过程中的冷拉伸行为。研究了分支数量、分支长度和片层数量对纤维生长的影响。发现分支长度并不重要。增加分支含量降低的百分比结晶度，从而导致在层间变形机制的重要性增加。在一些样品中观察到双屈服点。分子和片层变形是完全可逆的第一屈服点，并分摊到细链滑移的激活。第二屈服点后，粗链滑移导致片层破碎负责，变形是不可逆的。
The cold drawing behaviour of a range of polyethylene copolymers was investigated using the technique of simultaneous small- and wide-angle X-ray scattering (SAXS and WAXS, respectively) during deformation. The influence of branch amount, branch length and lamellar population were studied. Branch length was found to be unimportant. Increasing branch content lowered the percentage crystallinity which resulted in an increase in the importance of interlamellar deformation mechanisms. Double yield points were observed in some samples. Molecular and lamellar deformation was totally reversible up to the first yield point, and was apportioned to the activation of fine chain slip. After the second yield point, for which coarse chain slip leading to lamellar fragmentation was held responsible, deformation was irreversible.