Mehrsa Emami

Mehrsa Emami
Iran Polymer and Petrochemical Institute · modeling and control

Doctor of Engineering

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18
Publications
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125
Citations

Publications

Publications (18)
Article
This study investigates the influence of particle size of Ziegler-Natta (ZN) catalysts on the microstructure and properties of related polypropylenes. In this regard, three catalysts were synthesized with different particle sizes (PS) including PS < 25, 25 ≤ PS ≤ 45, and PS > 45 μm, but from the same ingredients. The catalyst characterization invol...
Article
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The aim of this work is to investigate the influence of the ethanol content of adducts on the catalytic behavior of related Ziegler–Natta (ZN) catalysts in propylene homo- and copolymerizations (with 1-hexene comonomer) in terms of activity, isotacticity, H2 response, and comonomer incorporation. For this purpose, three MgCl2.nEtOH adducts with n v...
Article
Ionic liquid based systems are used to facilitate the cationic polymerization of isobutylene to conventional grade polyisobutylene (PIB) using AlCl3 as an initiator. Specifically, the compound 1-butyl-3-methylimidazolium chloride (IL) is employed as a reference system due to its simplicity, as well as the polyionic liquid (PIL), prepared via radica...
Article
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The role of the pore architecture of the Ziegler-Natta (ZN) catalysts in the propylene polymerizations is unveiled, towards the catalyst activity, H2- and comonomer-response, and final properties of the synthesized polymer. In this regard, two commercially available ZN catalysts (Cat-A and Cat-B belong to the 4th generation, containing diisobutyl p...
Article
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In this study, the microstructural, flow, and mechanical properties of two commercially available high‐density polyethylene (HDPE) samples with different particle sizes were quantified. Specifically, two different blow molding and film grade HDPEs produced by the same catalyst under different conditions were acquired in powder form after dryer sect...
Article
Full-text available
In this work, we reported the development of a mini-reactor experimental setup for synthesizing of polypropylene with heterogeneous Ziegler–Natta catalysts in gas-phase. Use of pro-activated 4th generation of Ziegler–Natta catalyst and preheated monomer feed enabled the polymerization reaction to be carried out at constant temperature. Evaluation o...
Article
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MCM-41/TiCl 4 /MgCl 2 /THF; bi-supported; ethylene polymerization; Ziegler-Natta; polyethylene nano-fibres. O ne of the known groups of mesoporous materials is MCM-41 that has been extensively used as support for different types of catalysts. In the present work, rod-like MCM-41 was synthesized to support TiCl 4 /MgCl 2 /THF catalyst to form the bi...
Article
This note shows that some of the results, interpretations and discussions presented by Dong et al. [X. Dong, L. Wang, J. Zhou, H. Yu, T. Sun, Catalysis Communications 7 (2006) 1–5] may not be correct. Here by comparing the internal diameter of beta-cyclodextrin pore and the external diameter of MCM-41 particles it is shown that a single MCM-41 part...
Article
This note shows that some of the results, interpretations and discussions presented by Dong et al. [X. Dong, L. Wang, J. Zhou, H. Yu, T. Sun, Catalysis Communications 7 (2006) 1–5] may not be correct. Here by comparing the internal diameter of beta-cyclodextrin pore and the external diameter of MCM-41 particles it is shown that a single MCM-41 part...
Article
MCM-41 is one of the groups of mesoporous materials that have wide applications as adsorbents, ion exchangers and catalyst supports. In this work spherical and rod-like MCM-41s were synthesized in homogeneous and heterogeneous reaction media, respectively. For synthesis of these materials the cationic surfactant cetyltrimethylammonium bromide (CTMA...
Article
Modeling of fluidized bed reactor for polyethylene production in the condensed mode operation is proposed in this paper. A two-phase model including the emulsion and bubble phases with the constant bubble size is employed to describe hydrodynamic behavior of the reactor. The kinetics of Ziegler-Natta polymerization is also modeled with a two active...
Article
P olypropylene/poly(ethylene-co-propylene) in-reactor blends were synthesized by sequential multi-stage polymerization technique using fifth generation of Ziegler-Natta catalyst. Blends of isotactic polypropylene (iPP) (with a minimum isotacticity index (II) of 97.5%) and at least 12% ethylene/propylene copolymer were successfully synthesized. Expe...
Article
Heterogeneous Ziegler–Natta catalyst of MgCl2 (ethoxide type)/TiCl4/diether was prepared. 2,2-Diisobutyl-1,3-dimethoxy propane (DiBDMP), diether, was used as internal donor. Slurry polymerization of propylene was carried out using the catalyst in dry heptane while triethylaluminium (TEA) was used as co-catalyst. The co-catalyst effects, such as cat...

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