Abstract
The local ordering of the phenyl groups in amorphous atactic polystyrene is investigated by radio-frequency-driven carbon-13 NMR polarization transfer (spin diffusion) between site-selectively carbon-13 labeled monomer units. The NMR data agree with atomistic simulations of atactic amorphous polystyrene where orientational correlations among the phenyl rings do not extend over distances larger than 5 A. This finding is at variance with earlier X-ray and neutron diffraction measurements.
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