Chain packing in ethoxyphenyl-polycarbonate by 13C{2H} REDOR

Rotational-echo double-resonance C-13{H-2} NMR has been used to characterize the chain packing in a C-13,H-2-labeled ethoxyphenyl-substituted bisphenol A polycarbonate. Approximately 36% of the repeat units are locally ordered, and between 85% and 95% of carbonate linkages are trans. The local order in interchain packing is correlated with the local order of intrachain conformations of the carbonate linkages.