ANNEALED SEGMENTED POLYETHER ESTER - POLY (VINYL-CHLORIDE) BLENDS

Hytrel, PVC and blends of these polymers containing, respectively, 75% and 45% by wt of Hytrel were annealed and the dynamic mechanical and sonic velocity behaviour of these annealed samples were compared with the unannealed materials. The annealed Hytrel showed evidence of enhanced segregation of the hard and soft segments, while for PVC there was a shift of the glass transition to a higher temperature. Annealing of the 75% by wt Hytrel blend resulted in increased phase separation of the constituent materials and a very broad tan δ-temperature dispersion. It was also concluded that the 45% by wt Hytrel blend again showed phase separation on annealing, but to a lesser extent. © 1979.