Publication
Title
X-ray microdiffraction study of chain orientation in poly(p-phenylene terephthalamide)
Author
Abstract
Single fibers of poly(p-phenylene terephthalamide) (PPTA; trade names: Kevlar(29), Kevlar(49), and Kevlar(149)) have been scanned through a 3 mu m diameter X-ray beam and the degree of orientation (f(c)) determined at every point. All samples show a gradient in f(c) values from the skin to the core. The highest degree of orientation was found at the edges of the fibers. This effect is particularly strong for Kevlar(29). In addition, ripples in orientation were observed along the fiber axis for Kevlar(29), but on a smaller scale than the transversal gradient. Upon tensile deformation up to about 3 GPa applied stress, the transversal f(c) anisotropy is gradually reduced and disappears at the highest stress values. Kevlar(29) attains at about 1.5 GPa applied stress the same degree of orientation as Kevlar(49).
Language
English
Source (journal)
Macromolecules / American Chemical Society. - Washington, D.C.
Publication
Washington, D.C. : 1999
ISSN
0024-9297
Volume/pages
32:23(1999), p. 7859-7865
ISI
000083775500020
Full text (Publishers DOI)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 03.01.2013
Last edited 25.04.2017
To cite this reference