ISSN:
1022-1352
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The synthesis of two new isomeric asymmetrically disubstituted disulfide monomers, [4-(3-hydroxyphenylthio)benzoic acid and 3-(4-hydroxyphenylthio)benzoic acid], with potential applications as all-aromatic polymer chain flexibilizers and flame-retardant additives, is here reported. The preparation and characterization of their homo- and copolymers obtained with 4-hydroxybenzoic acid, terephthalic acid and hydroquinone or its phenyl and methyl derivatives is also described. The purity of the monomers has been determined by gas chromatography, elemental analysis and NMR spectroscopy. Both monomers and polymers have been characterized by several techniques. DSC analysis and optical microscopy in polarized light have been used to determine the phase behaviour of the polymers. The remarkable differences in crystallinity and mesogenicity of the polymers derived from the two isomeric monomers are compared to the behaviour of copolymers containing the analogous oxygen-bridged compounds.
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1996.021970509
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