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Synthesis and Characterization of Aromatic Poly(benzobisthiazole)s and Poly[oxy(bisbenzothiazole)]s Containing Flexible Linkages
Author(s) -
Cerruti Pierfrancesco,
Maglio Giovanni,
Palumbo Rosario,
Tortora Mariarosaria
Publication year - 2002
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 - 10.1002/1521-3935(20020201)203:3<484::aid-macp484>3.0.co;2-u
Subject(s) - polymer chemistry , condensation polymer , thermal stability , monomer , chemistry , methanesulfonic acid , benzothiazole , phosphoric acid , ether , solvent , glass transition , polymerization , solubility , arylene , fourier transform infrared spectroscopy , aryl , organic chemistry , polymer , alkyl , chemical engineering , engineering
Aromatic poly(benzothiazole)s (PBT)s were prepared by direct polycondensation of multi‐ring dicarboxylic acids containing aryl ether or 2,2′‐hexafluoroisopropylidene flexible groups and 2,5‐diamino‐1,4‐benzenedithiol (PBT I) or 3,3′‐oxybis(6‐aminobenzenethiol) (PBT II) using poly(phosphoric acid) or poly(phosphoric acid)/methanesulfonic acid as condensing agent and solvent. Inherent viscosities were in the range 0.62–2.68 dL/g, indicating moderate polymerization degrees. The molecular structure was checked by FTIR and 1 H NMR spectroscopy. Good solubility in polar aprotic organic solvents was observed for PBTs derived from monomers containing flexibilizing groups in both moieties. Glass transition temperatures ranged between 268 and 312°C for PBTs I, and between 219 and 233°C for PBTs II. Both PBTs I and II possessed good thermal and thermooxidative stability.