A study of sodium-copper and sodium-nickel polyphosphate glasses by differential scanning calorimetry

Sodium polyphosphate and sodium-copper and sodium-nickel copolyphosphate glasses (with the ratio Na : M = 9 : 1 and 8 : 2, where M is Cu or Ni) are studied. The glass transition (T-g) and melting (T-m) temperatures are determined by differential scanning calorimetry (DSC). It is revealed that the T-g and T-m temperatures depend on the molecular weight M, (determined from terminal groups) of polymeric glasses, the Na : M ratio, and the glass synthesis conditions. The activation energies are calculated, and the thermodynamic parameters DeltaH, DeltaS, and C-P are measured.