Temperature and Volume Effects on Local Segmental Relaxation in Poly(vinyl acetate)

@inproceedings{Roland2003TemperatureAV,
  title={Temperature and Volume Effects on Local Segmental Relaxation in Poly(vinyl acetate)},
  author={C M Roland and Riccardo Casalini},
  year={2003}
}
Dielectric data on the local segmental relaxation of amorphous poly(vinyl acetate) (PVAc) are analyzed. At atmospheric pressure, the fragility (Tg-normalized temperature dependence) is invariant to molecular weight. Since the fragility is also independent of pressure, the combined temperature and pressure dependences of the relaxation times can be analyzed using the Avramov model of structural relaxation. This entropy model gives a satisfactory description of the data and yields an expression… CONTINUE READING