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Thermotropic liquid crystalline halatopolymers
Author(s) -
Ibidapo T. Adesanya
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760301806
Subject(s) - thermotropic crystal , liquid crystal , differential scanning calorimetry , materials science , ionic liquid , aqueous solution , divalent , crystallography , polymer , optical microscope , liquid crystalline , polymer chemistry , organic chemistry , scanning electron microscope , chemistry , composite material , physics , optoelectronics , metallurgy , thermodynamics , catalysis
Divalent metal (I.e.) Ba(2+), Ca(2+i), Mg(2+), Mn(2+), Cd(2+), Zn(2+), Pb(2+), and Sn(2+) salts of monovalent organic acids (i.e. p‐methoxycinnamic, cinnamic, p‐methoxybenzoic, and 4‐n‐butoxybenzoic) were synthesized via the double decomposition reaction from aqueous solution. Optical microscopy and differential scanning calorimetry (DSC) analysis showed that this series of salts formed nematic liquid crystals. DSC thermograms were characterized by broad nematic‐to‐isotropic transitions indicative of biphasic regions in which the nematic and isotropic phases coexist. These liquid crystalline salts were polymeric when melted due to ionic crosslinking which took place through the coordination of the divalent metal ion. Except Sn (2+) and Pb(2+), all the liquid crystalline halato‐polymers were spun into fibers.