Synthesis, thermal and radiation sensitivities of some linear aromatic polyesters

✍ Scribed by Choi, E-Joon; Hill, David J T; Kim, Ki Yup; O’Donnell, James H; Pomery, Peter J; Whittaker, Andrew K

• Publisher: John Wiley and Sons
• Year: 1999
• Tongue: English
• Weight: 131 KB
• Volume: 48
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(199910)48:10<971::aid-pi256>3.0.co;2-g

✦ Synopsis

Two series of polyesters have been synthesized, one based on terephthalic acid and the other based on 2,6-naphthalene-dicarboxylic acid. Three diols were used: ethylene glycol, 1,4-butanediol and 1,10-decanediol. The polymers have been characterized and their thermal and radiation stabilities examined. The temperatures for 5% weight loss at a scanning rate of 20 °C min À1 were in the range 376± 424 °C. The stability of the polyesters 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 phthalate polyesters and in the range 0.08±0.12 for the naphthalate-based polymers. The radical yields increased with an increasing number of carbon atoms in the diol units. Radiolysis at 298 K produced radical yields in the range 0.02±0.06 for the phthalate polyesters and in the range 0.01±0.05 for the naphthalate-based polymers.