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首页> 外文期刊>Journal of Applied Polymer Science >A comprehensive investigation of the origins of surface roughness and haze in polyethylene blown films
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A comprehensive investigation of the origins of surface roughness and haze in polyethylene blown films

机译：全面研究聚乙烯吹膜表面粗糙度和雾度的起因

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In an earlier publication we showed that the optical haze properties of blown and cast polyethylene (PE) films were adversely affected (i.e., haze increased) as a result of enhanced surface roughness caused by the formation of distinct optically anisotropic "spherulitic-like" superstructures. In this report we have found that for a very wide variety of PE blown films, the total haze percent exhibited a complex parabolic relationship with the logarithm of the recoverable shear strain parameter, gamma(proportional to). At low values of gamma(proportional to), superstructures were developed (as discussed in our previous report) that increased surface roughness and hence total haze. As gamma(proportional to) increased, such superstructures were either significantly diminished in size or altogether absent, giving rise instead to an oriented, row-nucleated, stacked lamella texture that decreased surface roughness and hence total haze. However, at even higher gamma(proportional to) values, representing highly melt elastic behavior, fine-scale surface roughness due to high melt elastic instabilities was induced, thereby increasing surface roughness and consequently total haze as well. It was demonstrated in this work that two PE resins could exhibit the same level of total haze as a consequence of two completely different mechanisms or origins. Furthermore, we believe that this is the first time that both very low and very high melt elasticity have been shown as primary causative factors in yielding high haze in PE blown films, albeit for fundamentally very different reasons. (C) 2002 Wiley Periodicals, Inc. [References: 61]
机译：在较早的出版物中，我们表明吹塑和浇铸聚乙烯（PE）薄膜的光学雾度特性受到不利影响（即雾度增加），这是由于形成了独特的光学各向异性“球状”超结构而导致表面粗糙度增加的结果。在此报告中，我们发现，对于多种PE吹塑薄膜，总雾度百分比与可恢复的剪切应变参数gamma（成正比）的对数表现出复杂的抛物线关系。在较低的伽玛值（与比例成比例）下，会形成上层建筑（如我们先前的报告中所述），从而增加了表面粗糙度，从而增加了总雾度。随着γ（与γ成正比）的增加，此类上层建筑的大小显着减小或完全不存在，取而代之的是产生了定向的，行成核的，堆叠的薄片质地，从而降低了表面粗糙度，从而降低了总雾度。然而，在甚至更高的代表高度熔体弹性行为的伽马值（与之成比例）下，由于高熔体弹性不稳定性而引起了小规模的表面粗糙度，从而增加了表面粗糙度并因此也增加了总雾度。在这项工作中证明，由于两种完全不同的机理或来源，两种PE树脂可能表现出相同的总雾度。此外，我们认为这是首次将非常低的熔体弹性和非常高的熔体弹性作为PE吹塑薄膜中产生高雾度的主要成因，尽管有根本不同的原因。 （C）2002 Wiley Periodicals，Inc. [参考：61]

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