13C NMR analysis of poly[(m‐phenylene terephthalate)‐co‐oxybenzoate]s: Main‐chain and end‐group resonance assignments and sequence distribution

Abstract Samples of poly[(m‐phenylene terephthalate)‐co‐oxybenzoate] with different compositions were analyzed by 13C NMR spectroscopy. Diad and triad signals could be identified and assigned. Furthermore, the signals of acetoxy, carboxy and hydroxy end‐groups were assigned. The analysis of NMR substituent effects confirms the assignment. Comparison of the calculated statistical with the experimentally determined diad and triad contents shows a slight tendency for the formation of oxybenzoate blocks in the polymer chain.