THERMAL TRANSITIONS AND POLYMER POLYMER MISCIBILITY .1. PVC/EVA IMMISCIBLE SYSTEMS/

In order to provide additional information on the miscibility of the P VC/EVA system, calorimetric parameters such as Delta C-pi, T-gi and De lta(gi) were obtained with a different approach. A qualitative and qua ntitative measure of the blend composition at the interface was obtain ed. this indicated that the domains are rich in each component and the presence of the second component in the phase has little effect on th e main chain relaxation. The PVC fraction in the EVA-rich phase is alw ays larger than the EVA fraction in the PVC-rich phase. Positive and s mall values of the Flory-Huggins interaction parameter were obtained f rom calorimetric data.