Chain Packing in Linear Phenol−Polycarbonate by 13C{2H} REDOR
- Robert D. O'Connor
- ,
- Barbara Poliks
- ,
- Daniel H. Bolton
- ,
- Jon M. Goetz
- ,
- Jeffery A. Byers
- ,
- Karen L. Wooley
- , and
- Jacob Schaefer
Abstract
Interchain packing in [carbonyl-13C, phenol-2H]phenol-substituted bisphenol A polycarbonate (a totally amorphous polymer by X-ray powder diffraction) has been characterized by 13C{2H} rotational-echo double-resonance (REDOR) NMR measurements on a 10 Å distance scale. Differences in the REDOR dephasing rates of the centerband and spinning sidebands of the carbonyl carbon resonance prove the presence of local orientational order. Approximately 70% of the repeat units are locally ordered. For the most tightly packed pairs of chains, the phenol 2H of one chain is 4−5 Å from the carbonate 13C of the other chain, and the interchain 2H−13C dipolar vector has an orientation of approximately 30° (azimuthal) and 70° (polar) in the carbonyl carbon chemical shift tensor reference frame. The REDOR determination of these packing parameters is model-independent. Both random and chain-pair models were generated to describe the chain packing, but only the chain-pair model was consistent with the REDOR distance and orientation results.
†
Washington University.
‡
Binghamton University.
§
Present address: Bayer Plastics Division, Pittsburgh, PA 15205.
#
Present address: Varian Associates, Palo Alto, CA 94304.
*
Corresponding author: phone 314-935-6844; Fax 314-935-4481; e-mail [email protected].
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