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Melt‐polymerized aliphatic‐aromatic copolyamides. I. Melting points of nylon 66 copolymerized with aromatic diamines and terephthalic acid
Author(s) -
Kudo K.,
Suguie T.,
Hirami M.
Publication year - 1992
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1992.070440916
Subject(s) - melting point , terephthalic acid , polymer chemistry , materials science , polymerization , nylon 66 , crystal structure , crystallography , chemistry , polymer , polyamide , polyester , composite material
Measurements of melting points were made for melt‐polymerized aliphatic‐aromatic copolyamides; (i) N66PT, (ii) N66CT, and (iii) N66ST, i.e., nylon 66 [poly(hexamethylene adpamide)] copolymerized with three kinds of aromatic diamines, p ‐phenylenediamine (P), bis ( p ‐aminophenyl) methane (C), and bis ( p ‐aminophenyl) sulfone (S), and terephthalic acid (T). As the mole fraction of copolymerized component n 1 , increases in the case of (ii) or (iii), the melting point decreases uniformly according to the relationship of Flory. In the case of (i), the melting point first decreases and then begins to increase after passing a minimum at n 1 ≃ 0.2. A preliminary WAXD (wide‐angle X‐ray diffraction) study on N66PT crystals shows that the basal plane of the crystal lattice shifts from that of nylon 66 toward hexagonal packing with the increase of n 1 . It was suggested that the formation of mixed crystals for a series of N66PT will be attributed to their melting point behavior.