Effects of melt-extension and annealing on row-nucleated lamellar crystalline structure of HDPE films
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- Effects of melt-extension and annealing on row-nucleated lamellar crystalline structure of HDPE films
- Lee, Sang-Young; Park, Soon-Yong; Song, Heon-Sik
- Annealing; Crystallization; HDPE; Lamellar; Structure-property relations
- Issue Date
- JOURNAL OF APPLIED POLYMER SCIENCE, v.103, no.5, pp.3326 - 3333
- The row-nucleated lamellar crystalline structure of high-density polyethylene (HDPE) films was prepared by applying elongation stress to 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 contribution of melt-extension represented by draw-down-ratio (DDR) to the overall orientation was found to be most noticeable than other processing variables. Meanwhile, the long-period lamellar spacing, the crystallite size, and the degree of crystallinity were influenced predominantly by the annealing temperature. Finally, the processing (melt extension and annealing temperature) structure (lamellar crystalline structure) - property (hard elasticity) relationship of HDPE films was investigated.
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