Synthesis, thermal and radiation sensitivities of some linear aromatic polyesters

Citation
Ej. Choi et al., Synthesis, thermal and radiation sensitivities of some linear aromatic polyesters, POLYM INT, 48(10), 1999, pp. 971-979
Citations number
18
Categorie Soggetti
Organic Chemistry/Polymer Science
Journal title
POLYMER INTERNATIONAL
ISSN journal
09598103 → ACNP
Volume
48
Issue
10
Year of publication
1999
Pages
971 - 979
Database
ISI
SICI code
0959-8103(199910)48:10<971:STARSO>2.0.ZU;2-0
Abstract
Two series of polyesters have been synthesized, one based on terephthalic a cid and the other based on 2,6-naphthalene-dicarboxylic acid. Three diols w ere used: ethylene glycol, 1,4-butanediol and 1,10-decanediol. The polymers have been characterized and their thermal and radiation stabilities examin ed. The temperatures for 5% weight loss at a scanning rate of 20 degrees C min(-1) were in the range 376-424 degrees C. The stability of the polyester s decreased as the number of carbon atoms in the aliphatic diol increased, and the terephthalate polymers were not as stable as the naphthalate-based polymers. On radiolysis at 77 K about 50% of the radicals formed were anion radicals, with the total radical yields in the range 0.19-0.41 for the pht halate polyesters and in the range 0.08-0.12 for the naphthalate-based poly mers. The radical yields increased with an increasing number of carbon atom s in the diol units. Radiolysis at 298 K produced radical yields in the ran ge 0.02-0.06 for the phthalate polyesters and in the range 0.01-0.05 for th e naphthalate-based polymers. (C) 1999 Society of Chemical Industry.