2002 Volume 51 Issue 2 Pages 60-65
Effect of plasticization on free-volume hole size observed by means of positronium lifetime measurement was studied. Glass transition temperature significantly decreased with an increase of dioxane content while free-volume hole size increased Temperature dependence of the excess free-volume hole size by addition of dioxane was examined Hole formation energy EPsH for the excess free-volume was estimated on an assumption of a Boltzmann type distribution. As the result, estimated value of EPsH well agreed with those for several polymer systems previously obtained by means of heat capacimetry.
