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Structure and properties of melt‐extruded laRC‐IA (3,4′‐ODA 4,4′‐ODPA) polyimide fibers
Author(s) -
Dorsey K. D.,
Desai P.,
Abhiraman A. S.,
Hinkley J. A.,
St. Clair T. L.
Publication year - 1999
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19990815)73:7<1215::aid-app15>3.0.co;2-1
Subject(s) - polyimide , materials science , tenacity (mineralogy) , composite material , crystallinity , crystallization , ultimate tensile strength , amorphous solid , optical microscope , modulus , polymer , diffraction , scanning electron microscope , crystallography , chemical engineering , optics , chemistry , physics , layer (electronics) , engineering
LaRC‐IA polyimide fibers were extruded from the melt and drawn. The fibers were characterized by sonic pulse propagation, polarized optical microscopy, calorimetric analysis, X‐ray diffraction, and tensile testing. When the amorphous, essentially isotropic, as‐extruded filaments were heated slowly in a calorimeter, no “cold” crystallization could be detected. However, when these filaments were drawn at temperatures above the T g of the polymer, they crystallized rapidly to produce oriented semicrystalline structures. The consequent increases in modulus and strength were significant, with the properties reaching the levels of commercial fibers of intermediate tenacity. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 1215–1222, 1999