Citation: Yun-hui Zhao a, Fen Wang a, Xu-bo Yuan a, Gen-hui Xu b, Jing Sheng a. SYNTHESIS AND AVERAGE SEQUENCE LENGTH DETERMINATION OF AROMATIC-ALIPHATIC COPOLYESTERS CONTAINING POLY(ALKYLENE OXALATE) UNITS[J]. Chinese Journal of Polymer Science, ;2008, 26(2): 221-229. shu

SYNTHESIS AND AVERAGE SEQUENCE LENGTH DETERMINATION OF AROMATIC-ALIPHATIC COPOLYESTERS CONTAINING POLY(ALKYLENE OXALATE) UNITS

Received Date: 27 March 2007
Revised Date: 4 May 2007

Two series of aromatic-aliphatic random copolyesters (PEBTOXS) with diverse diol ratios have been synthesized by direct melting polycondensation. Two kinds of diols (glycol (EG) and 1,4-butanediol (BD)) are used in combination in order to adjust crystallization and tensile properties, and three kinds of diacids (dimethyl terephthalate (DMT), diethyl oxalate (DEOX), and sebacic acid (SA)) are involved. 1H-NMR spectra quantify both composition and structure, and show that the final contents in copolyesters appropriate to the feed ratio. Average sequence lengths of six polyester units are calculated based on the analyses of 1H-NMR spectra and copolyester structure. The results reveal that the average sequence lengths of sebacate related units increase with the increasing content of sebacic acid in copolyesters, while those of oxalate related units show a slight rise. Decreases of average sequence length are found for all terephthalate units, which may be because of the restriction of rigid aromatic units in reactions.
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