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1. Dynamic disorder and conformer exchange in the crystalline monomer of polycarbonate

Author

Wolak, J. E., Knutson, J., Martin, J. D., Boyle, P., and Sargent,Andrew L.; White,Jeffery L.

Subjects
Crystallization -- Research, Monomers -- Research, Monomers -- Chemical properties, Monomers -- Atomic properties, Polycarbonates -- Research, Chemicals, plastics and rubber industries
Abstract

Measurements of chemical exchange events in the crystalline polycarbonate monomer 4,4'-isopropylidenediphenol (bisphenol A, BPA) via 2D 13C solid-state NMR shows slow, large-amplitude aromatic ring orientations. Experiments with multiple exchange times show that ring flips occur in all of the three unique conformers found in the crystalline unit cell of this compound, but in specific cases, two of the three unique molecules actually switch conformations.

Published
2003

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