In addition, the observed fusion enthalpy of oxidized
PP and PCL phases in various compositions
are lower than the calculated fusion enthalpy. Those
results might be caused by the presence of a small
amount of oxidized PP and PCL to form compatible
polymer blends. Based on the difference between calculated
and observed fusion enthalpies, the percentage
of compatible polymer blends obtained from modified
PP and PCL can be predicted in which the highest percentage
of the compatible polymer blends is obtained
in PP/PCL ratio of 70/30 (% w/w) (Table I).