An investigation of permanganic etching of linear low-density polyethylene
An investigation of permanganic etching of linear low-density polyethylene
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DOI：
10.1080/00222348808260838
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发表时间：
1988-12
期刊：
影响因子：
--
通讯作者：
A. Freedman;D. Bassett;R. Olley
中科院分区：
文献类型：
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作者：
A. Freedman;D. Bassett;R. Olley
摘要高锰腐蚀是一种选择性地去除材料以显示结晶聚合物中的薄片的技术。通常发现，具有不同厚度的薄片的群体被移除到不同的深度。在线性聚乙烯，我们以前已经表明，这种歧视是不是一个固有的属性，但在切割过程中的差异变形的结果，以暴露表面蚀刻之前。这项工作现在扩展到线性低密度聚乙烯，以测试分子分离的变化基础（稍后有更多的支链分子结晶）是否会改变蚀刻行为。它示出，较薄的薄片被蚀刻在一个更快的速度，这是只有轻微减少后，由于切割去除损坏。晶体厚度之间的这种内在差异伴随着比线性材料更快的蚀刻速率。这可能是由于在低密度线相较低密度线相更易穿透的折叠面上断链更快所致。
Abstract Permanganic etching is a technique of removing material selectively to reveal lamellae in crystalline polymers. It is generally found that populations of lamellae with different thicknesses are removed to different depths. In linear poly-ethylene we have previously shown that this discrimination is not an inherent property but a consequence of differential deformation during cutting to expose the surface prior to etching. The work is now extended to linear low-density polyethylene to test whether the changed basis of molecular segregation (with more branched molecules crystallizing later) alters the etching behavior. It is shown that thinner lamellae are etched at a faster rate which is only slightly reduced after removing damage due to cutting. This intrinsic differentiation between crystal thicknesses accompanies faster etching rates than for the linear material. It is inferred that this is due to faster chain scission at fold surfaces which are more penetrable for the linear low-density than f...