Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)137-146
Journal / PublicationJournal of Applied Polymer Science
Volume104
Issue number1
Publication statusPublished - 5 Apr 2007

Abstract

Poly(ethylene terephthalate) was extruded, solid-state-drawn, and annealed to simulate the structure of poly(ethylene terephthalate) microfibers in a poly(ethylene terephthalate)/polypropylene blend. Differential scanning calorimetry and wide-angle X-ray scattering analyses were conducted to study the structural development of the poly(ethylene terephthalate) extrudates at different processing stages. The as-extruded extrudate had a low crystallinity (∼ 10%) and a generally random texture. After cold drawing, the extrudate exhibited a strong molecular alignment along the drawing direction, and there was a crystallinity gain of about 25% that was generally independent of the strain rates used (0.0167-1.67 s-1). 26 scans showed that the strain-induced crystals were less distinctive than those from melt crystallization. During drawing above the glass-transition temperature, the structural development was more dependent on the strain rate. At low strain rates, the extrudate was in a state of flow drawing. The resultant crystallinity hardly changed, and the texture remained generally random. At high strain rates, strain-induced crystallization occurred, and the crystallinity gain was similar to that in cold drawing. Thermally agitated short-range diffusion of the oriented crystalline molecules was possible, and the resultant crystal structure became more comparable to that from melt crystallization. Annealing around 200°C further increased the crystallinity of the drawn extrudates but had little effect on the texture. © 2007 Wiley Periodicals, Inc.

Research Area(s)

  • Annealing, Blends, Drawing, Molecular dynamics

Citation Format(s)

Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers. / Leung, F. K P; Cheung, W. L.; Lin, X. D.; Jia, D.; Chung, C. Y.

In: Journal of Applied Polymer Science, Vol. 104, No. 1, 05.04.2007, p. 137-146.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review