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Main chain modification of aromatic polyamides by incorporation of kinked, flexible monomers
Author(s) -
Maglio Giovanni,
Palumba Rosario,
Vignola Maria Carmela
Publication year - 1995
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.1995.021960905
Subject(s) - polyamide , terephthalic acid , polymer chemistry , monomer , condensation polymer , triphenyl phosphite , pyridine , ether , chemistry , thermal stability , aramid , organic chemistry , polymer , materials science , polyester , fiber
Multiring diamines and diacids containing ether and isopropylidene or hexafluoroisopropylidene bridges between phenyl groups were used alone or together with 1,4‐phenylenediamine and terephthalic acid to prepare flexible or semirigid aromatic polyamides by direct polycondensation using triphenyl phosphite and pyridine as condensing agents. All the polyamides are readily soluble in N,N ‐dimethylacetamide, N ‐methyl‐2‐pyrrolidone and N,N ‐dimethylformamide. The wholly flexible polyamides are completely amorphous whereas those prepared from 1,4‐phenylenediamine or terephthalic acid are partially crystalline and melt in the temperature range from 276 to 330°C. Thermal analysis shows T g 's in the range from 204 to 216°C for the wholly flexible polyamides and in the range from 239 to 257°C for the semirigid ones. Both classes of aromatic polyamides show excellent thermal resistance which is comparable with that of rigid‐rod aramides.