Tokiyo OHYAMA
Measurement of dynamic viscoelasticity of silicate glasses
Kazumasa MATUSITA
In this study, viscoelasticity was investigated quantitatively of glasses at temperatures much lower than glass transition temperature. Storage and loss elastic moduli of silicate glasses were measured by dynamic method which can obtain elastic and viscous components simultaneously in a short time. Theviscosity of the silicate glasses was obtained from the measurement results. The viscosity at Tg measured by dynamic method was approximately 10^12¡¡Pa¡¦s agreeing with that by static method. Relation between the volume and viscosity was analysed based on free volume theory, and it is found that thetemperature change of viscosity agreed with by free volume theory.
It was concluded that viscosities of most oxide glasses were shown by free volume theory, including borate and phosphate glasses reported already
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