Macromolecules, Vol.28, No.15, 5320-5324, 1995
Characterization of Local Order in Atactic Polystyrene Using 2-Dimensional Nuclear-Magnetic-Resonance and Atomistic Simulations
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 Angstrom. This finding is at variance with earlier X-ray and neutron diffraction measurements.