Lamellar crystalline structure of hard elastic HDPE films and its influence on microporous membrane formation
Lamellar crystalline structure of hard elastic HDPE films and its influence on microporous membrane formation
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DOI：
10.1016/j.polymer.2006.03.070
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发表时间：
2006-05-03
期刊：
影响因子：
4.6
通讯作者：
Song, Heon-Sik
中科院分区：
文献类型：
--
作者：
Lee, Sang-Young;Park, Soon-Yong;Song, Heon-Sik
研究了硬弹性高密度聚乙烯（HDPE）前驱体膜的制备及其对微孔膜形成的影响。作为第一步，通过在t压铸薄膜挤压过程中对HDPE熔体施加延伸应力并随后退火，制备了具有“排核片层晶”结构的HDPE前驱体薄膜。从片层晶体取向、长周期片层间距、晶粒尺寸和结晶度等方面分析了这种不同寻常的晶体结构。研究了HDPE前驱体膜的工艺（熔体延伸和退火温度）-结构（片层晶体结构）-性能（硬弹性）的关系。硬弹性HDPE前驱体膜的单轴拉伸引起晶片的弯曲，导致晶片之间形成微孔。对HDPE微孔膜的形貌和透气性进行了观察，结果表明，在高应力水平和高退火温度下制备的前驱体膜具有良好的透气性。最后，讨论了HDPE前驱体膜的硬弹性与相应微孔膜透气性的关系。(c) 2006 Elsevier Ltd.版权所有。
The development of hard elastic high-density polyethylene (HDPE) precursor films and its influence on the microporous membrane formation have been investigated. As a first step, the HDPE precursor films with 'row-nucleated lamellar crystalline' structure were prepared by applying elongation stress to the HDPE melt during T-die cast film extrusion and subsequently annealing the extruded films. This unusual crystalline structure was analyzed in terms of lamellar crystalline orientation, long-period lamellar spacing, crystallite size, and degree of crystallinity. The processing (melt extension and annealing temperature)-structure (lamellar crystalline structure)-property (hard elasticity) relationship of HDPE precursor films was also investigated. The uniaxial stretching of hard elastic HDPE precursor films induces the bending of crystalline lamellae, which leads to the formation of micropores between them. The observation of morphology and air permeability for the HDPE microporous membranes have revealed that the well-developed porous structures characterized by superior air permeability were established preferably from the precursor films prepared by the high stress levels and the high annealing temperatures. Finally, the relationship between the hard elasticity of HDPE precursor films and the air permeability of corresponding microporous membranes was discussed. (c) 2006 Elsevier Ltd. All rights reserved.