UNUSUAL ORIENTATION PHENOMENA IN POLYETHYLENE INTERPRETED IN TERMS OF THE MORPHOLOGY
UNUSUAL ORIENTATION PHENOMENA IN POLYETHYLENE INTERPRETED IN TERMS OF THE MORPHOLOGY
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DOI：
10.1002/pol.1955.120157904
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发表时间：
1955-01-01
影响因子：
3.4
通讯作者：
KELLER, A
中科院分区：
文献类型：
--
作者：
KELLER, A
在论文的第一部分中，根据形成球晶的亚微观螺旋内发生的变化来解释拉伸松弛行为的各种取向现象。不仅绘图和放松，但也放松样品的重绘，它表明，所观察到的异常取向效应不能用简单的指数的平面倾斜来描述。然而，通过考虑亚微观单元的可能形状，这些取向效应可以被可视化。第二部分介绍了一种新的一般定向类型--“行定向”。当熔体流动时发生结晶时，就会出现这种情况。流动产生高核密度的线，导致微晶在垂直于拉伸方向的所有方向上生长。这导致了螺旋的伸长聚集体，并且这些复杂单元的排列产生了已经从各种角度建立的独特类型的取向。
In the first part of the paper various orientation phenomena of the drawing‐relaxation behavior are interpreted in terms of the changes occurring within the submicroscopic helices which form the spherulites. Not only drawing and relaxation but also the redrawing of the relaxed samples were followed, and it was shown that the observed anomalous orientation effects cannot be described in terms of tilts of planes with simple indices. However, by considering also the possible shapes of the submicroscopic units these orientation effects can be visualized. In the second part a new general type of orientation, the “row orientation” is introduced. This arises when crystallization takes place while the melt is flowing. Flow produces lines of high nucleus density, leading to growth of the crystallites in all directions perpendicular to the direction of drawing. This results in elongated aggregates of helices, and the alignment of these complex units produces a unique type of orientation which has been established from various angles.