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Based on the effects of solvent and temperature on the 282-MHz 19F-NMR spectrum of poly(vinylidene fluoride), PVF2, in perdeuterated dimethylacetamide (DMA-d9) solution at -20°C, nine minor CF2 resonances that are due to structures in the vicinity of reversed monomer enchainments have been identified. 19F-19 F spin-spin decoupling and two-dimensional 19F-correlation spectroscopy (19F-2D COSY) have been used to assign these resonances. In several cases these assignments differ from those made previously.
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Lin et al. (1989) studied this question.
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