Temperatures of secondary relaxation transitions of binary polymer blends processed by supercritical carbon dioxide

We have used FTIR spectroscopy of conformationally inhomogeneous probes to study the influence of supercritical carbon dioxide on the local molecular dynamics in the blends of polyvinyl butyral and polyethylene glycol with the following compositions: 80:20, 60:40, 40:60, and 20:80. The temperatures of secondary relaxation transitions in these blends after the processing by supercritical carbon dioxide have been determined.