Relevant bibliographies by topics / Polymers and polymerization Ziegler-Natta catalysts. Polypropylene

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Academic literature on the topic 'Polymers and polymerization Ziegler-Natta catalysts. Polypropylene'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Polymers and polymerization Ziegler-Natta catalysts. Polypropylene"

1

Zhang, He-xin, Byeong-Gwang Shin, Dong-Eun Lee, and Keun-Byoung Yoon. "Preparation of PP/2D-Nanosheet Composites Using MoS2/MgCl2- and BN/MgCl2-Bisupported Ziegler–Natta Catalysts." Catalysts 10, no. 6 (2020): 596. http://dx.doi.org/10.3390/catal10060596.

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Polypropylene/molybdenum disulfied (PP/MoS2) and Polypropylene/hexagonal boron nitride (PP/hBN) nanocomposites with varying concentration (0–6 wt %) were fabricated via in situ polymerization using two-dimensional (2D)-nanosheet/MgCl2-supported Ti-based Ziegler–Natta catalysts, which was prepared through a novel coagglomeration method. For catalyst preparation and interfacial interaction, MoS2 and hBN were modified with octadecylamine (ODA) and octyltriethoxysilane (OTES), respectively. Compared with those of pristine PP, thermal stability of composites was 70 °C higher and also tensile streng
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2

Shamiria, Ahmad, M. A. Hussaina, Farouq Mjallic, and Navid Mostoufid. "Comparative simulation study of gas-phase propylene polymerization in fluidized bed reactors using aspen polymers and two phase models." Chemical Industry and Chemical Engineering Quarterly 19, no. 1 (2013): 13–24. http://dx.doi.org/10.2298/ciceq111214038s.

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A comparative study describing gas-phase propylene polymerization in fluidized-bed reactors using Ziegler-Natta catalyst is presented. The reactor behavior was explained using a two-phase model (which is based on principles of fluidization) as well as simulation using the Aspen Polymers process simulator. The two-phase reactor model accounts for the emulsion and bubble phases which contain different portions of catalysts with the polymerization occurring in both phases. Both models predict production rate, molecular weight, polydispersity index (PDI) and melt flow index (MFI) of the polymer. W
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3

Llinas, Geraldo Hidalgo, S. H. Dong, Daniel T. Mallin, et al. "Homogeneous Ziegler-Natta catalysts. 17. Crystalline-amorphous block polypropylene and nonsymmetric ansa-metallocene catalyzed polymerization." Macromolecules 25, no. 4 (1992): 1242–53. http://dx.doi.org/10.1021/ma00030a007.

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4

Steinmetz, B., B. Weimann, G. Fink, and B. Tesche. "SIO2-Supported Metallocene Catalysts for Propene Polymerization: Electron Microscopic Studies and Tomographical Reconstructions of Polymer Growth." Microscopy and Microanalysis 6, S2 (2000): 1126–27. http://dx.doi.org/10.1017/s1431927600038125.

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Summary:The polypropylene growth process on silica supported metallocene catalysts was examined by electron microscopy and kinetic investigations. It was possible to identify different polymerization stages with different characteristic kinetic data in the slurry phase which led to the development of a refined polymer growth model [1-2]. Tomographical reconstruction of shortly polymerized catalyst particles obtained by electron micrographs of serial microtome sections turned out to be a useful tool to achieve a better understanding of the heterogeneous polymerization process and the influence
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5

Li, Kang, Hangsheng Zhou, Yawei Qin, Ying Zhao, Dujin Wang та Jin-Yong Dong. "ω-Alkenylmethyldichlorosilane-assisted propylene polymerization with Ziegler-Natta catalyst to long chain-branched polypropylene". Polymer 202 (серпень 2020): 122737. http://dx.doi.org/10.1016/j.polymer.2020.122737.

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6

Alshaiban, Ahmad, and João B. P. Soares. "Effect of Varying Hydrogen Concentration, External Donor Concentration, and Temperature on Propylene Polymerization Kinetics and Microstructure of Polypropylene Made with a 4th Generation Ziegler-Natta Catalyst." Macromolecular Reaction Engineering 8, no. 10 (2014): 723–35. http://dx.doi.org/10.1002/mren.201400028.

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7

Fu, Zhisheng, Junting Xu, Yanzhong Zhang, and Zhiqiang Fan. "Chain structure and mechanical properties of polyethylene/polypropylene/poly(ethylene-co-propylene)in-reactor alloys synthesized with a spherical Ziegler-Natta catalyst by gas-phase polymerization." Journal of Applied Polymer Science 97, no. 2 (2005): 640–47. http://dx.doi.org/10.1002/app.21805.

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8

Fu, Zhisheng, Qi Dong, Na Li, Zhiqiang Fan, and Junting Xu. "Influence of polymerization conditions on the structure and properties of polyethylene/polypropylene in-reactor alloy synthesized in the gas phase with a spherical Ziegler–Natta catalyst." Journal of Applied Polymer Science 101, no. 4 (2006): 2136–43. http://dx.doi.org/10.1002/app.22429.

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9

Poorsank, Fatemeh, Hassan Arabi, and Nona Ghasemi Hamedani. "Silyl diol ester as a new selectivity control agent in MgCl2-supported Ziegler–Natta systems for propylene polymerization: catalyst structure and polymer properties." RSC Advances 9, no. 13 (2019): 7420–31. http://dx.doi.org/10.1039/c9ra00715f.

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In this study, bis(benzoyloxy)dimethylsilane (SDE) was developed as a non-phthalate selectivity control agent (internal donor (ID) and external donor (ED)) in MgCl<sub>2</sub>-supported Ziegler–Natta (ZN) systems for polypropylene polymerization.
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10

Zhang, Zhen, Baiyu Jiang, Feng He, Zhisheng Fu, Junting Xu, and Zhiqiang Fan. "Comparative Study on Kinetics of Ethylene and Propylene Polymerizations with Supported Ziegler–Natta Catalyst: Catalyst Fragmentation Promoted by Polymer Crystalline Lamellae." Polymers 11, no. 2 (2019): 358. http://dx.doi.org/10.3390/polym11020358.

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The kinetic behaviors of ethylene and propylene polymerizations with the same MgCl2-supported Ziegler–Natta (Z–N) catalyst containing an internal electron donor were compared. Changes of polymerization activity and active center concentration ([C*]) with time in the first 10 min were determined. Activity of ethylene polymerization was only 25% of that of propylene, and the polymerization rate (Rp) quickly decayed with time (tp) in the former system, in contrast to stable Rp in the latter. The ethylene system showed a very low [C*]/[Ti] ratio (&lt;0.6%), in contrast to a much higher [C*]/[Ti] r
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