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Synthesis, thermal and radiation sensitivities of some linear aromatic polyesters
Author(s) -
Choi EJoon,
Hill David J T,
Kim Ki Yup,
O’Donnell James H,
Pomery Peter J,
Whittaker Andrew K
Publication year - 1999
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/(sici)1097-0126(199910)48:10<971::aid-pi256>3.0.co;2-g
Subject(s) - terephthalic acid , polyester , radiolysis , diol , radical , polymer , polymer chemistry , dicarboxylic acid , materials science , dimethyl terephthalate , thermal stability , naphthalene , ethylene glycol , phthalate , organic chemistry , chemistry
Abstract 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 −1 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. © 1999 Society of Chemical Industry