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Synthesis of a liquid crystalline semi‐ordered aromatic polyester and high‐resolution solid‐state 13 c nmr investigation of local motions
Author(s) -
Jo ByungWook,
Jin JungIi,
Laupretre Francoise
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971180138
Subject(s) - isophthalic acid , crystallinity , hydroquinone , polyester , liquid crystalline , materials science , glass transition , polymer , polymer chemistry , high resolution , resolution (logic) , hydroxybenzoic acid , crystallography , solid state , carbon 13 nmr , chemistry , organic chemistry , composite material , remote sensing , artificial intelligence , computer science , terephthalic acid , geology
A liquid crystalline sequence‐ordered polyester was prepared from isophthalic acid and 4‐hydroxyphenyl 4‐hydroxybenzoate in a 1:1 mole ratio. The local motions of this polymer were investigated by high‐resolution solid‐state 13 C NMR and the results were compared to data obtained on liquid crystalline or semicrystalline random terpolyesters with very similar compositions. Whereas no motions of the hydroquinone rings could be detected below the glass‐transition temperature of the semi‐ordered polymer, the para ‐hydroxybenzoic acid units exhibit a certain degree of freedom in the temperature range between 450 K and 500 K.