7a, tan [delta] peaks of the blends are broader and higher than that of the neat PVC in the low-temperature range because of the contribution from the molecular relaxation of CPE, PBA, and PBA-g-PMMA, following as the order of peak areas and intensity, neat PVC < blends F0 < blends Fl < blends F4, which is just in line with the change in impact strength values and ductile-brittle transition temperature
regions of the blends.
The ductile-brittle transition temperature
, as measured on compression-molded specimens using the razor-notched Charpy impact test, appears to be a reasonably good indicator of the S4 [T.
Ductile-brittle transition temperature
(DBTT) was lowered as a friction of increasing MAH ratio.
The phenomenology of polymeric fracture is examined, including brittle and ductile failure, and the ductile-brittle transition temperature
Results from the impact tests show that in blends with an IPN structure, the continuous SEBS phase affords the material a high impact resistance, which is maintained at temperatures well below the ductile-brittle transition temperature
of PP, and is not markedly affected by the presence of a weld line.