Sequence analysis of poly(ethylene/1,4-cyclohexanedimethylene terephthalate) copolymer using H and C NMR |
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Authors: | Hironori MatsudaBunsow Nagasaka Tetsuo Asakura |
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Affiliation: | a Department of Biotechnology, Tokyo University of Agriculture and Technology, Nakacho 2-chome, Koganei, Tokyo 184-8588, Japan b Material Analysis Research Laboratories, Teijin Ltd, Hino, Asahigaoka 4-chome, Hino, Tokyo 191-8512, Japan |
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Abstract: | The triad-level sequence analysis of poly(ethylene/1,4-cyclohexanedimethylene terephthalate) copolymer was reported in a solvent system of o-chlorophenol/deuterated chloroform mixture (50/50 v/v) at 80 °C using 600 MHz 1H NMR. The well-resolved alcoholic CH2 proton peak of the glycol units was observed, which made the detailed sequence analysis possible. The peaks of the cis- and trans-forms of the 1,4-cyclohexanedimethylene glycol units were split into the triad sequence in the chain and could be assigned by a comparison of the spectra with those of homopolymers and by an additional two-dimensional heteronuclear multiple bond correlation observation. The triad sequence distributions centered on 1,4-cyclohexanedimethylene glycol units were determined, which was independent of the cis- and trans-forms of the units and controlled according to Bernoullian statistics. |
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Keywords: | Poly(ethylene/1,4-cyclohexanedimethylene terephthalate) 1H and 13C NMR Triad sequence analysis |
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