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Synthesis and characterization of poly(arylene ether sulfone amide)s
Author(s) -
Hsiao ShengHuei,
Huang PerngChih
Publication year - 1997
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.1997.021981218
Subject(s) - arylene , triphenyl phosphite , polymer chemistry , terephthalic acid , polyamide , condensation polymer , glass transition , ether , differential scanning calorimetry , sulfone , isophthalic acid , materials science , pyridine , dicarboxylic acid , chemistry , polymer , organic chemistry , polyester , aryl , alkyl , physics , thermodynamics
Methyl‐substituted or unsubstituted aromatic dicarboxylic acids and diamines containing ether and sulfone linkages between phenylene units were used alone or in combination with p ‐phenylenediamine, m ‐phenylenediamine, terephthalic acid, and isophthalic acid to prepare flexible or semirigid aromatic polyamides by direct polycondensation activated by triphenyl phosphite and pyridine. The inherent viscosities of the obtained polymers ranged from 0.40 to 1.01 dL/g. The wholly flexible polyamides are amorphous, are readily soluble in N , N ‐dimethylacetamide, dimethyl sulfoxide, and m ‐cresol, and can afford transparent, flexible, and tough films by solution‐casting. The polyamides prepared from p ‐phenylenediamine or terephthalic acid are partially crystalline and melt around 410°C. Differential scanning calorimetry shows glass transition temperature in the 202–255°C range for the wholly flexible polyamides. All the polyamides are thermally stable in excess of 400°C. The methyl‐substituted polyamides had higher glass transition temperatures, but lower initial decomposition temperatures, than the corresponding unsubstituted polyamides.