1st Place, 88th Annual Meeting, Feb 2017, Tampa - Sara L. Wingstrand
1st Place, 88th Annual Meeting, Feb 2017, Tampa
Extensional rheology and final morphology of LDPE fibers Sara L. Wingstrand1, Martin van Drongelen1, Kell Mortensen2, Richard S. Graham3, Qian Huang1, and Ole Hassager1
1Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark; 2University of Copenhagen, København Ø, Denmark; 3University of Nottingham, Nottingham, United Kingdom
Paper Number
PO65
Session
Poster Session
Title
Extensional rheology and final morphology of LDPE fibers
Presentation Date and Time
February 15, 2017 (Wednesday) 6:00
Track / Room
Poster Session / Foyer-Stairs/Windows
Authors (Click on name to view author profile)
Author and Affiliation Lines (in printed abstract book)
Sara L. Wingstrand1, Martin van Drongelen1, Kell Mortensen2, Richard S. Graham3, Qian Huang1, and Ole Hassager1
1Department of Chemical and Biochemical Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark; 2University of Copenhagen, København Ø, Denmark; 3University of Nottingham, Nottingham, United Kingdom
Speaker / Presenter
Wingstrand, Sara L.
Text of Abstract
Properties of polymeric fibers are highly dependent on the molecular conformation induced during processing[1]. In this study we investigate the influence of non-linear extensional flow on the molecular conformation of branched semi-crystalline polymers. Such materials show a stress overshoot when stretched at a constant extensional rate[2]. The common explanation is, that at first the backbone stretches until the stress maximum is reached. This is followed by a collapse of the branches causing backbone retraction and thus the decrease in stress[3]. Consequently, one would expect the greatest molecular orientation in fibers quenched at the stress maximum. Indeed we find that this is true and also a more general observation that the final orientation scales with stress at quench in the melt.