Abstract
The dyad and triad-level sequence analyses of polyarylate; U-Polymer, which is an aromatic copolyester of bisphenol-A and 50/50 isophthalic/terephthalic acid, and of polyestercarbonate prepared from U-Polymer and bisphenol-A polycarbonate were reported in a solvent system of o-chlorophenol/deuterated chloroform mixture (75/25 v/v) at 80 °C using 600 MHz proton nuclear magnetic resonance (1H NMR). The well-resolved proton peaks were observed, which made the detailed sequence analysis possible. The methyl proton peaks of the bisphenol-A units were split into the dyad sequence in the chain. The aromatic proton peaks of the isophthalic and terephthalic units were split into the triad sequence in the chain. These peaks could be assigned by a comparison with the spectra of homopolymers and the model copolymers. It was confirmed that the sequence distribution in U-Polymer and the polyestercarbonate are random and obey Bernoullian statistics, and the dyad and triad information obtained coincides with each other by a comparison of the number-average sequence lengths from the dyad and triad sequences. 13C NMR peaks of the aliphatic quaternary carbons of bisphenol-A units were also split into the dyad sequence in the chain. It was confirmed that the solvent system of the 75/25 (v/v) mixture of o-chlorophenol /deuterated chloroform has the potentiality for the detailed sequence analysis of polyarylate and polyestercarbonate.
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Matsuda, H., Nagasaka, B. & Asakura, T. Sequence Analysis of Polyarylate (U-Polymer) and Its Polyestercarbonate Using 1H and 13C NMR. Polym J 35, 740–747 (2003). https://doi.org/10.1295/polymj.35.740
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DOI: https://doi.org/10.1295/polymj.35.740