Propylene polymerization with MgCl2/Mixed-IDs/TiCl4 system in the presence of different external donor structures
2021
An insight into the effect of different external donor structures, comprised of bis-methoxymethyl-fluorene (BMF) and 2, 2-diisopropyl succinate (IPS), on the performance of MgCl2 supported mixed internal donor (ID) Ziegler-Natta catalyst in propylene polymerization is developed and the resules compared with conventional alkoxysilane external donor. Catalyst's performance is explained through the coordination nature of external donors and its correlation with the composition of internal donors. Using BMF as external donor lead to the increase of catalyst activity and this increase is higher in systems with higher fraction of BMF in mixed-ID. On the other hand, IPS as external donor is more efficient in converting low molar mass centers to higher ones and this is more remarkable in systems with higher fraction of IPS in mixed- ID. Meanwhile, composition of mixed-ID has the most impact on stereoregularity and lamella thickness of polymer chains. A promising feature of these data is providing a guideline to study the effect of one compound (diether or succinate) in both ID and ED roles.
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