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Author

Lee, Sang-Young
Energy Soft-Materials Lab (ESML)
Research Interests
  • Soft Materials for Energy Storage/ Conversion Systems

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Lamellar crystalline structure of hard elastic HDPE films and its influence on microporous membrane formation

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Title
Lamellar crystalline structure of hard elastic HDPE films and its influence on microporous membrane formation
Author
Lee, Sang-YoungPark, SYSong, HS
Keywords
HDPE; Lamellar crystalline; Microporous membrane
Issue Date
200605
Publisher
ELSEVIER SCI LTD
Citation
POLYMER, v.47, no.10, pp.3540 - 3547
Abstract
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.
URI
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DOI
http://dx.doi.org/10.1016/j.polymer.2006.03.070
ISSN
0032-3861
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