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Spinning and characterization of fibers from poly(2,6‐dichloro‐ p ‐phenyleneterephthalamide): a study of constitutional isomerism and solid‐state arrangements by comparison between simulation and experiment
Author(s) -
Glomm Bernhard H.,
Rutledge Gregory C.,
Küuchenmeister Frank,
Neuenschwander Peter,
Suter Ulrich W.
Publication year - 1994
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1994.021950209
Subject(s) - crystallinity , spinning , materials science , condensation polymer , polymer , crystal structure , polymer chemistry , crystallography , crystal (programming language) , synthetic fiber , liquid crystal , diffraction , fiber , composite material , chemistry , optics , physics , optoelectronics , computer science , programming language
Fibers of three constitutionally isomeric rigid‐rod polymers, produced by polycondensation of 2,6‐dichloro‐ p ‐phenylenediamine and terephthaloyl dichloride, were spun from nematic solutions and characterized by wide‐angle X‐ray diffraction (WAXD) measurements and mechanical tests. A post‐spin heat treatment was employed to improve the low degrees of orientation and crystallinity that the untreated fibers showed. The dominating crystal structure of constitutionally ordered head‐to‐head/tail‐to‐tail fibers seems to be very similar to “Modification II” of the fibers from poly( p ‐phenyleneterephthalamide) (PPTA), but the fibers do not suffer a comparable structural transformation upon heat treatment. Influences of the constitutional regularity in the chains on the crystal structure, structural order and mechanical properties of the fibers could be observed. Both the observed crystal structure and the experimentally determined mechanical properties agree well with the results of detailed atomistic modeling predictions.