Abstract
The local segregation and dynamics of poly(propyl methacrylate) (PPMA) are studied as a function of temperature by X-rays and by dielectric spectroscopy and rheology, respectively. Pressure is employed in dielectric spectroscopy for investigating the origin of segmental dynamics and for separating the segmental from the faster β-process. The segmental dynamics of PPMA is controlled mainly by temperature via the intramolecular barriers. The pressure coefficient of the glass temperature is one of the lowest ever reported (dTg/dP=150K/GPa). Based on this finding we examined a possible correlation between the values of the ratio of the apparent activation energy.
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