Dynamic mechanical analysis was used to study the viscoelastic propert
ies of two novel highly filled phosphate glass-polymer melt blends to
accelerate efforts to optimize their melt processing. The melt of one
blend was thermally stable while that of the other blend was not, as e
videnced by modulus growth over time of the latter. The frequency depe
ndencies of storage and loss moduli for both blends at 400 degrees C s
howed evidence of incomplete relaxation. Recrystallization, formation
of some fibrillar structures within the polymer phase during flow, tra
nsesterification of the polymer phase, or interactions between the pol
ymer and glass are thought to be responsible for the observed differen
ces between the viscoelastic properties of the two blends.