Synthesis and Characterization of Thermotropic Poly(benzobisthiazole)s

Thermotropic polymers containing the benzo [2,3-d;4,5-d'] bisthiazole-2,6-diyl unit combined with 2,5-bis(n-alkoxy)-1,4-phenylene (Cn-PTBT) or 5-(alkyloxy)-1,3-phenylene units (Cn-PIBT) were synthesized via precursor polyamides prepared by low-temperature solution polycondensation. The polyamid...

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Bibliographic Details
Published in:Macromolecules 1994-11, Vol.27 (6), p.1303-1306
Main Authors: Kimura, Kunio, Meurer, David L, Hutzler, Rene F, Cassidy, Patrick E, Fitch, J. W
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular structures
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:Thermotropic polymers containing the benzo [2,3-d;4,5-d'] bisthiazole-2,6-diyl unit combined with 2,5-bis(n-alkoxy)-1,4-phenylene (Cn-PTBT) or 5-(alkyloxy)-1,3-phenylene units (Cn-PIBT) were synthesized via precursor polyamides prepared by low-temperature solution polycondensation. The polyamides were converted into Cn-PTBT or Cn-PIBT by heating at 250 deg C. All polymers except for one containing 2,5-bis(n-butyloxy)-1,4-phenylene showed anisotropic melt phases in the range of 280-450 deg C. Characterization of these polymers by differential scanning calorimetry, thermal optical analysis, X-ray diffraction, and thermogravimetric analysis is reported. The polymers were not stable at high temperatures due to decomposition of the alkyloxy side chains.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma00084a003