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Polyanhydrides—4. Poly(ester-anhydride)s derived from terephthalic acid and bisphenol-A

✍ Scribed by Hans R. Kricheldorf; Claas Jürgens

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
419 KB
Volume
30
Category
Article
ISSN
0014-3057

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✦ Synopsis

Abstraet--Poly(ester-anhydride)s based on terephthalic acid, isophthalic acid and bisphenol-A were prepared in two ways, either by polycondensation with acetic anhydride or via the "silyl method". The copoly(ester-anhydride)s prepared by means of acetic anhydride possess a higher degree of crystallinity and lower solubility probably due to a greater blockiness of their sequence. Soluble and meltable poly(ester-anhydride)s were obtained by cocondensation of terephthaloylchloride with silylated bisphenol-A and silylated 4-hydroxybenzoic acid or 6-hydroxynaphthoic acid. They were characterized by elemental analyses, viscosity measurements, i.r. spectra, ~3C-NMR spectra, DSC measurements, WAXS powder patterns and optical microscopy. The copoly(ester-anhydride) with the highest molar fraction of 6-hydroxy-2-naphthoic acid forms a nematic melt above its melting point at 250 °.

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