Nona Ghasemi Hamedani - National Petrochemical Company-Research & Technology Co.(NPC-RT),Tehran,IRAN
Fatemeh Poorsank - National Petrochemical Company-Research & Technology Co.(NPC-RT),Tehran,IRAN
Mehdi Ghafelebashi Zarand - National Petrochemical Company-Research & Technology Co.(NPC-RT),Tehran,IRAN

An insight into the effect of diether and succinate structures on both internal and external donor roles on the performance of MgCl۲/ID/TiCl۴ is developed. Catalyst's performance mainly including activity, hydrogen response and molecular weight distribution is explained through the coordination nature of external donors and its correlation with the internal donor. This report offers the unique opportunity of studying the behavior of diether and succinate on both internal and external donor roles and guides us in designing catalyst system according to the characteristics of desired polypropylene.

Polypropylene, molecular weight distribution, Ziegler-natta catalyst, internal/external donor.