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“Bishydrazid A2”: A new semiaromatic film and fiber‐forming polymer based on bisacid A2
Author(s) -
Lenk R. S.,
Kinstle J. F.
Publication year - 1977
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/app.1977.070210603
Subject(s) - differential scanning calorimetry , polymer , materials science , fiber , formic acid , polymer chemistry , extrusion , amorphous solid , chemical engineering , spinning , elemental analysis , solvent , condensation polymer , composite material , chemistry , organic chemistry , physics , engineering , thermodynamics
We report the preparation of the dihydrazide of bisacid A2 (“bisdihidrazide A2”). Its composition and structure have been verified by elemental analysis and by means of infrared and NMR spectra. This material was then converted into a polyhydrazide (“bishydrazid A2”) in an HCl‐accepting solvent. The polymer was converted to fiber by wet spinning the dope obtained during the polycondensation reaction without prior neutralization or dilution. Film was cast from a solution of the precipitated and washed polymer which had an inherent viscosity of about 0.8; mechanical tests on the film—both before and after treatment with formic acid—were carried out. Differential scanning calorimetry showed an α/β transition comparable to that shown by bisacid A2 polyaramides and described in preceding papers 1,2 . Wide‐angle x‐ray scattering showed that the polymer is amorphous. Scanning electron micrographs revealed the physical structure of wet‐spun fiber and the probable mechanism of fiber formation by dope extrusion into a water bath.