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Thermal and mesogenic properties of semirigid polyamides based on mono‐ or trimethylsubstituted 1,3‐diaminobenzenes
Author(s) -
Sato M.,
Ujiie S.
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.1997.021980113
Subject(s) - mesogen , mesophase , polyamide , polymer chemistry , intermolecular force , polymer , hydrogen bond , chemistry , amide , organic chemistry , molecule , liquid crystalline , phase (matter)
Thermal and mesogenic properties of semirigid polyamides composed of one benzene ring with a kinked linkage and various aliphatic chains in the repeating unit, which are derived from three 1,3‐diaminobenzenes and aliphatic dicarboxylic acids, were examined. Only two polyamides with a long aliphatic chain (C 18 H 36 ), based on 4‐methyl‐ and 2,4,6‐trimethyl‐1,3‐diaminobenzenes, form mesophases although the polymers exert nontraditional mesogenic units. Formation of the mesophase in the latter case depends on the inherent viscosity, i.e., polymers with lower inherent viscosity (⩽1,47 dL/g) form a layered structure by intermolecular interaction via hydrogen bonding of the amide linkage.