Study of the Sequence Distribution of Poly(neopentyl isophthalate-fumarate) by 1H Nuclear Magnetic Resonance.

The sequence distribution of poly(neopentyl isophthalate-fumarate) was studied by high-resolution 1 H nuclear magnetic resonance ( 1 H-NMR). The 1 H-NMR signals of methylic and methylenic protons of the copolyester were split into five and six peaks, reflecting the linkages between neopentyl glycol (N) and two kinds of acids, i.e. isophthalic acid (I) and fumaric acid (F). All of the peaks were assigned and the dyad sequence (F-N-F, F-N-I, I-N-I etc.) distribution of poly(neopentyl isophthalate-fumarate) was clarified on the basis of the 1 H-NMR spectrum