DOUBLE YIELD IN TENSILE DEFORMATION OF HIGH-DENSITY POLYETHYLENE FIBER

Authors
Citation
Vb. Gupta et Sk. Rana, DOUBLE YIELD IN TENSILE DEFORMATION OF HIGH-DENSITY POLYETHYLENE FIBER, Journal of macromolecular science. Physics, B37(6), 1998, pp. 783-804
Citations number
21
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Polymer Sciences
ISSN journal
0022-2348
Volume
B37
Issue
6
Year of publication
1998
Pages
783 - 804
Database
ISI
SICI code
0022-2348(1998)B37:6<783:DYITDO>2.0.ZU;2-8
Abstract
Fiber-grade high-density polyethylene (HDPE) was melt spun into a mult ifilament yarn that, after quenching in air, was wound at speeds in th e range 450 m/min to 1000 m/min. Tensile tests on these anisotropic ya rns showed two yield points of varying intensity, similar to those rep orted in the literature for compression molded, isotropic HDPE sheets and films. However, unlike the sheets, the second yield in the case of fibers always occurred at a stress higher than that for the first yie ld. More detailed studies on the yarn spun at 450 mi min showed that t hese characteristics persisted at different strain rates and test temp eratures and were also present in the heat-set as-spun samples. The ap plicability of the existing models to explain the double-yield phenome non has been critically examined in the light of the results obtained. For this, the necessary structural and morphological characterization of the samples was also done.