13C High-Pressure CPMAS NMR Characterization of the Molecular Motion of Polystyrene Plasticized by CO2 Gas

Abstract

13C high-pressure CPMAS NMR is applied to examine the interaction between a CO2 gas and polystyrene under CO2 gas pressures of 0−7 MPa. The molecular motion of polystyrene at atmospheric pressure is also studied for comparison by 13C CPMAS NMR in the temperature range 35−104 °C. The obtained 13C CPMAS NMR spectra and 13C T*1ρ values show that while the interchain distances in the densely packing regions are heterogeneously expanded with increasing temperature, they are homogeneously expanded at high CO2 gas pressures.