It was found that addition of small amount of sorbitol derivative increase the crystallization temperature of iPP to 18 C
compared to neat iPP. No further increase in the crystallization temperature when the amount of additive reach 0.5 wt% for para chloro derivatives. The para chloro substitution was the most effective of all the studied derivatives to nucleate iPP. DSC
studies also showed that derivatives did not change the melting temperature of iPP. The addition of 0.5 % wt of p-Cl-DBS
ncreased the degree of crystallinity of iPP. On the other hand,