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Liquid crystal polymers. III. Preparation and properties of poly(ester amides) from p ‐aminobenzoic acid and poly(ethylene terephthalate)
Author(s) -
Jackson W. J.,
Kuhfuss H. F.
Publication year - 1980
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.1980.070250815
Subject(s) - polyester , condensation polymer , polymer chemistry , polymer , materials science , ethylene , branching (polymer chemistry) , liquid crystal , amide , organic chemistry , chemistry , composite material , catalysis , optoelectronics
Poly(ester amides) with physical properties similar to those of liquid crystalline polyesters were prepared by acidolysis of poly(ethylene terephthalate) with p ‐acetamidobenzoic acid and then polycondensation through the acetamido and carboxyl groups. The ester amide polymers had a random sequence distribution, contained some branching, and at low frequencies had relaxation times appreciably longer than those of poly(ethylene terephthalate). Because of the extended chain orientation of the polymer segments that contained p ‐aminobenzoic acid (PAB) units, the mechanical properties of injection‐molded polymers containing 20–30 mole % PAB were anisotropic. The liquid crystalline characteristics and mechanical properties were further increased by incorporating p ‐hydroxybenzoic acid units into the polymers.