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Structure‐property relations and processing of rod‐like aromatic polyamides
Author(s) -
Hatke Wilfried,
Schmidt HansWerner
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910500106
Subject(s) - biphenylene , crystallinity , polyamide , monomer , materials science , lyotropic , polymer chemistry , polyester , condensation polymer , polymer , terephthalic acid , crystallography , chemical engineering , chemistry , composite material , liquid crystalline , phenylene , engineering
Homopolyamides and copolyamides with structural characteristics such as bulky lateral substituents, non‐coplanar, 2, 2′‐dimethylbiphenylene units and comonomers of different length were prepared and their structure‐property relations investigated. Polyamides with high solubilities and very low or no degree of crystallinity are obtainable by a combination of monomers with bulky lateral substituents and non‐coplanar biphenylene units. These polyamides form tough, transparent films with good mechanical and thermal properties. Lyotropic liquid crystalline behavior was found in some cases for polyamides with non‐coplanar biphenylene units. The incorporation of monomers with bulky substituents on the terephthalic acid unit lowers the chain stiffness and significantly influences the formation of lyotropic solutions.