the elastomeric nature of NR in PET/NR blend and the extent of degradation of PET
matrix phase [19,20]. Fox et al. [21] found a significantly greater degradation of PET occurred when it was part of a blend than that when the PET was alone, even when both were processed under similar conditions. It appears that the degradation is catalyzed by some component such as water in PET. Rigorously drying, however, did not ameliorate the reduction of degradation in the blend.