Morphological and structural evolution of tensile deformed high density polyethylene during melting: in situ synchrotron small-angle X-ray scattering study
Morphological and structural evolution of tensile deformed high density polyethylene during melting: in situ synchrotron small-angle X-ray scattering study
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熔融过程中拉伸变形高密度聚乙烯的形态和结构演化：原位同步加速器小角X射线散射研究
DOI：
10.1179/174328910x12777566997577
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发表时间：
2010-11
影响因子：
2
通讯作者：
Men, Yongfeng
中科院分区：
文献类型：
--
作者：
Tang, Yujing;Jiang, Zhiyong;Men, Yongfeng
采用同步辐射小角X射线散射技术研究了淬火高密度聚乙烯试样在不同应变下的形态和结构演变。在一维散射强度分布分析的基础上，提出了聚乙烯熔融的一般方案：在结晶温度以下发生表面熔融，然后在熔融的最后阶段通过顺序熔融和堆叠熔融进行熔融和再结晶和/或片层增厚过程。结果表明，在未变形的情况下，淬火过程中结晶过程在约90°C完成，而对于高取向的样品，结晶温度相当于70°C，这归因于高应变速率引起的颈缩区的热效应。一个定性的论点，即各向同性材料具有一个广泛的分布的层状（或非晶畴）的厚度相对于高度取向的一个可以在温度依赖的一维相关函数。此外，它可以证明，适度的变形率不影响现有的叠层片晶的本征性质，通过直接比较的结构参数的演变过程中加热的层状结构。
The morphological and structural evolution of quenched high density polyethylene specimens subjected to different strains during the heating process was explored via synchrotron small-angle X-ray scattering technique. On the basis of one-dimensional scattering intensity distribution profile analysis, a general scheme for the melting of polyethylene was proposed that surface melting occurs below the crystallisation temperature, followed by melting and recrystallisation and/or lamellar thickening process via sequential melting and stack melting at the ultimate stages of melting. It was shown that in the case of undeformed specimen, the crystallisation process has finished at the temperature of ∼90°C during quenching, while the crystallisation temperature is equivalent to 70°C for the highly oriented sample, which was attributed to the thermal effects in the necked region due to high strain rate. A qualitative argument that the isotropic material possesses a wide distribution of lamellar (or amorphous domain) thicknesses with respect to the highly oriented one can be made in terms of the temperature dependent one-dimensional correlation function. In addition, it could be evidenced that moderate deformation ratio does not affect the intrinsic property of existing stacks of lamellar crystals by a direct comparison of the evolution of structural parameters of their lamellar structure during heating.
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影响因子：
4.6
作者：
Y. Tanabe;G. Strobl;E. W. Fischer
通讯作者：
Y. Tanabe;G. Strobl;E. W. Fischer
DOI：
10.1002/pol.1973.170111002
发表时间：
1973-10
期刊：
Journal of Polymer Science Part A
影响因子：
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作者：
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通讯作者：
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DOI：
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发表时间：
2001-12
期刊：
BMJ : British Medical Journal
影响因子：
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作者：
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通讯作者：
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影响因子：
4.6
作者：
J. Clements;H. G. Zachmann;I. Ward
通讯作者：
J. Clements;H. G. Zachmann;I. Ward
DOI：
10.1017/cbo9781139207249.009
发表时间：
2012
期刊：
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影响因子：
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作者：
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通讯作者：
W. Marsden