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International Journal of Polymer Science
Volume 2011 (2011), Article ID 731708, 7 pages
http://dx.doi.org/10.1155/2011/731708
Research Article

Three-Phase Characterization of Uniaxially Stretched Linear Low-Density Polyethylene

Department of Textiles, Ghent University, Technologiepark 907, 9052 Zwijnaarde, Belgium

Received 31 March 2011; Revised 12 July 2011; Accepted 20 August 2011

Academic Editor: Haojun Liang

Copyright © 2011 Blerina Kolgjini et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study comprises a detailed morphological study of cold-drawn polyethylene monofilaments by Raman spectroscopy, differential scanning calorimetry (DSC) and X-ray measurements. The structure of the three-phase morphology of the linear low-density polyethylene monofilaments was investigated by combining these measurements. It was found that the most important structure variation was found in the intermediate or rigid amorphous phase, whereby the amounts of crystalline and amorphous phases were nearly constant and almost independent of the cold-draw ratio. The intermediate third phase contains gauche and transmolecules, and the amount of transmolecules was increased with the cold-draw ratio and was directly related to this cold-draw ratio. It was found that the two peaks in the Raman spectra, respectively, at 1303 and 1295 cm-1, can be correlated to the amount of gauche and transmolecules in the polyethylene monofilaments. A good and new insight into the three-phase morphology was obtained by combining the DSC and X-ray measurements with the amounts of trans- and gauche molecules from the Raman spectra analysis.