Hierarchical solid-state structure and mechanical property relationships in cross-rolled polyethylene

Hierarchical solid-state structure and mechanical property relationships in cross-rolled polyethylene
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交叉轧制聚乙烯的分级固态结构与力学性能关系

DOI:
10.1016/j.polymer.2022.125039
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发表时间:
2022
期刊:
影响因子:
4.6
通讯作者:
Baer, E.
Baer, E.
中科院分区:
化学2区
文献类型:
--
作者:
McMullen, N.;Zhang, C.;Cheng, C.;Wnek, G.E.;Olah, A.;Baer, E.

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对聚乙烯双向冷轧变形进行了研究。目的是为了更好地了解随着厚度的减少而产生的分层结构的演变以及对力学性能的影响。当厚度降低60%时,轧制后的厚度回复率达到峰值,密度和结晶度迅速下降,从而获得更高的光学清晰度。拉伸试件在单轴拉伸过程中发生变形,屈服机制随轧制程度由颈缩和白化转变为扩散屈服过程。随之而来的是,在25°C和−40°C断裂时,也观察到了更大的加工硬化、断裂应力和弹性恢复。断口扫描电子显微镜显示,断口有离散的屈曲微层。此外,动态力学分析(DMA)显示了与β和α松弛相关的损耗峰的移动,这表明在60%的厚度减少时,主要的变形模式是扩张而不是压实。
Deformation of polyethylene by bidirectional cold rolling was investigated. The objective was to better understand the evolution of the hierarchical structure with thickness reduction and the effect on mechanical properties. At a 60% thickness reduction, the thickness recovery after rolling peaked, and the density and crystallinity decreased rapidly resulting in greater optical clarity. Tensile specimens were deformed in uniaxial tension, and it was observed that the yield mechanism shifted from necking and whitening to a diffuse yielding process with extent of rolling. Concomitant greater work hardening, fracture stress, and elastic recovery were also observed upon fracture at both 25 °C and −40 °C. Scanning electron micrographs of the fracture surface revealed discrete buckled microlayers. Furthermore, dynamic mechanical analysis (DMA) revealed the loss tangent peaks associated with the beta and alpha relaxations shifted, suggesting that dilatation rather than compaction was the dominant mode of deformation at 60% thickness reduction.
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