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Title: Quantitative orientational analysis of a polymeric material (Kevlar{sup {reg_sign}} fibers) with x-ray microspectroscopy

Abstract

It has previously been shown that x-ray linear dichroism microscopy can be utilized to image and determine orientation in a polymeric material at high spatial resolution. We have now expanded on this technique and extracted quantitative information about the orientation of specific functional groups in a polymeric system from submicron areas. This is accomplished by acquiring and analyzing spectral data sets rather than just images at specific energies. It has allowed us to compare the relative lateral orientation of various grades of Kevlar{sup {reg_sign}} fibers. {copyright} {ital 1996 American Institute of Physics.}

Authors:
;  [1]
  1. Department of Physics, North Carolina State University, Raleigh, North Carolina 27695-8202 (United States)
Publication Date:
OSTI Identifier:
399758
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 69; Journal Issue: 25; Other Information: PBD: Dec 1996
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 66 PHYSICS; POLYMERS; STRUCTURAL CHEMICAL ANALYSIS; X-RAY SPECTRA; DICHROISM; MICROSCOPY; FIBERS; ORIENTATION; THIN FILMS; BNL; MOLECULAR ORIENTATION

Citation Formats

Smith, A.P., and Ade, H.. Quantitative orientational analysis of a polymeric material (Kevlar{sup {reg_sign}} fibers) with x-ray microspectroscopy. United States: N. p., 1996. Web. doi:10.1063/1.117120.
Smith, A.P., & Ade, H.. Quantitative orientational analysis of a polymeric material (Kevlar{sup {reg_sign}} fibers) with x-ray microspectroscopy. United States. doi:10.1063/1.117120.
Smith, A.P., and Ade, H.. 1996. "Quantitative orientational analysis of a polymeric material (Kevlar{sup {reg_sign}} fibers) with x-ray microspectroscopy". United States. doi:10.1063/1.117120.
@article{osti_399758,
title = {Quantitative orientational analysis of a polymeric material (Kevlar{sup {reg_sign}} fibers) with x-ray microspectroscopy},
author = {Smith, A.P. and Ade, H.},
abstractNote = {It has previously been shown that x-ray linear dichroism microscopy can be utilized to image and determine orientation in a polymeric material at high spatial resolution. We have now expanded on this technique and extracted quantitative information about the orientation of specific functional groups in a polymeric system from submicron areas. This is accomplished by acquiring and analyzing spectral data sets rather than just images at specific energies. It has allowed us to compare the relative lateral orientation of various grades of Kevlar{sup {reg_sign}} fibers. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.117120},
journal = {Applied Physics Letters},
number = 25,
volume = 69,
place = {United States},
year = 1996,
month =
}
  • An attractive approach to enhancing the mechanical properties, environmental stability, processability, and other desirable characteristics of electrically conductive polymers is to prepare hybrid materials in which they are alloyed with polymers having complementary properties. In the case of polypyrrole, composite films have been prepared electrochemically on a small scale with poly(vinyl alcohol), poly(vinyl chloride), polyurethane, and polystyrene. The authors report a successful route to PPTA-polypyrrole hybrid fibers that capitalizes upon the high solubility of N-metalated PPTA and pyrrole in polar organic solvents. The composition and microstructure of representative PPTA/polypyrrole fibers were investigated by elemental analysis and scanning electron microscopy (SEM).
  • No abstract prepared.
  • We examine the unique situation involving the exposure of polymers to both electron bombardment and mechanical stress. Under certain conditions, crack formation, crack growth, and fracture can occur due to this combination of stimuli. These studies relate to the performance of a number of materials under hostile environments such as space, plasma, and propulsion systems. In this paper we present our initial measurements on the response of single Kevlar fibers loaded in tension to bombardment by 3-keV electrons. We present evidence that the resulting electron-beam-induced fracture is due to bond breaking.
  • The possibility that significant numbers of asbestos fibers were present in the urine of residents of the Everett area of Washington State was investigated. Two groups of residents were used: one group had resided in the area less than 3 months; the other, more than 20 y. Tapwater in the area contained about 200 x 10/sup 6/ fibers/liter. A control group was obtained from Seattle where the tapwater asbestos fiber content was 100 times less. At no time did the asbestos content of the urine samples from Everett consistently exceed that of the control's. There was a significant difference inmore » the asbestos content of urine samples from subjects with less than 3 y residence times vs those with more than 20 years. Asbestos concentrations in the urine samples from Everett residents as a whole did not differ significantly from that in samples from Seattle residents. Variable degrees of chrysotile contamination of control water samples and of Nuclepore membrane filters presented a problem. The data are at present inconclusive but would suggest no relationship between high concentrations of fibers in drinking water and the numbers estimated for voided urine. 24 references, 6 figures, 4 tables.« less