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Synthesis and properties of polyamides based on a spirobichroman bis(ether‐carboxylic acid)
Author(s) -
Hsiao ShengHuei,
Yang ChingYen
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.1997.021980709
Subject(s) - benzidine , differential scanning calorimetry , polymer chemistry , polyamide , condensation polymer , chemistry , triphenyl phosphite , monomer , dimethylacetamide , pyridine , ether , glass transition , dicarboxylic acid , yield (engineering) , interfacial polymerization , carboxylic acid , polymer , organic chemistry , materials science , physics , solvent , metallurgy , thermodynamics
High molar‐mass aromatic polyamides were obtained from 7,7'‐bis(4‐carboxyphenoxy)‐4,4,4′,4′‐tetramethyl‐2,2′‐spirobichroman, a novel dicarboxylic acid monomer, by direct polycondensation reaction in N ‐methyl‐2‐pyrrolidone (NMP) with various aromatic diamines, using triphenyl phosphite and pyridine as condensing agents. Polyamides having inherent viscosities of 0,73–1,08 dL/g were obtained in quantitative yield. All the polyamides, even that derived from benzidine, are completely amorphous and readily soluble in a variety of organic solvents such as NMP, N , N ‐dimethylacetamide (DMAc), N , N ‐dimethylformamide (DMF), and m ‐cresol. Their solutions can be cast into transparent, flexible and tough films. All the polyamides show distinct glass transitions in the range of 182–235°C on their differential scanning calorimetry (DSC) traces. The 10% weight loss temperatures in nitrogen and air are above 416 and 422°C, respectively.