Effect of pressure on fragility and glass transition temperature in fragile glass-former

This paper presents the effect of pressure on liquid fragility in poly(bisp henol A-co-epichlorohydrin), glycidyl end capped. On the basis of temperatu re dependences of dielectric relaxation times measured for several differen t pressures, the steepness or fragility index m(T) has been calculated. We proved that liquid fragility is independent of pressure within experimental error. The influence of pressure on glass transition temperature has also been studied. It turned out that pressure dependence of glass transition te mperature is well represented by the second-order polynomial. (C) 1999 Amer ican Institute of Physics. [S0021-9606(99)50822-2].