Ziegler-Natta catalysts for olefin polymerizations

Soga, Kazuo

doi:10.1016/s0079-6700(97)00003-8

Cited by 264 publications

(121 citation statements)

References 71 publications

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“…Tetraethoxysilane, Si(OEt) 3 Cl, cyclopentanol, cyclohexanol, 2-ethylhexanol, anhydrous magnesium chloride, and AlEt 3 with 1.0 M in hexane were purchased from Acros Organics Agent in Beijing, China. Triethylamine, anhydrous ethanol, alcohol, hydrochloric acid, TiCl 4 , toluene, n-heptane, and n-hexane were purchased from Beijing Chemicals Company (Beijing, China).…”

Section: Methodsmentioning

confidence: 99%

“…After filtering the mixture, the filtrate was purified by vacuum to get a colorless transparent liquid, triethoxy cyclopentyloxy silane (ED1) with yield of 87. 3 Preparation of ED2. Under nitrogen atmosphere, the solution of 1.0 mL cyclohexanol in 100 mL n-hexane was added into a 300 mL Schlenk flask with a stirring bar.…”

Section: Scheme 1 Synthesis Of Electron Donors (Ed)mentioning

confidence: 99%

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Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor

Wang

et al. 2016

Polymers

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Two novel cycloalkoxy silane compounds (ED1 and ED2) were synthesized and used as the external electron donors (EEDs) in Ziegler-Natta catalysts with diethyl 2,3-diisopropylsuccinate as internal electron donor. The results indicated that the Ziegler-Natta catalysts using ED1 and ED2 as EEDs had high catalytic activities and good stereoselectivities. The melt flow rate (MFR) and gel permeation chromatography (GPC) results revealed that the obtained polypropylene has higher MFR and lower average molecular weights than the commercial EED cyclohexyl methyl dimethoxysilane. The differential scanning calorimetry (DSC) results indicated that new isospecific active centers formed after the introduction of new external donors. The work implied that the novel EEDs could improve the hydrogen sensitivities of the catalyst system and obtain polymers with high melt flow rate.

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Section: Methodsmentioning

confidence: 99%

Section: Scheme 1 Synthesis Of Electron Donors (Ed)mentioning

confidence: 99%

Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor

Wang

et al. 2016

Polymers

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“…It would certainly exceed by far the scope of this article if one attempted to give a comprehensive review on group IV-based polyole n chemistry. Fortunately, some excellent reviews on this topic, including carbocationic alkene polymerization [28], have been published quite recently and will serve as a reference for comprehensive reading [29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48]. Nevertheless, a few aspects of this chemistry that certainly deserve to be discussed will be mentioned.…”

Section: Group Iv-and V-based Systems (Ti Zr Hf)mentioning

confidence: 99%

Transition metal-based polymer chemistry: a critical micro-review

Buchmeiser¹

2002

Designed Monomers and Polymers

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Abstract-This micro-review summarizes mainly recent (i.e. mostly later than 1995) and important developments in transition metal-catalyzed polymerization and their impact on polymer synthesis. It is not intended to be entirely comprehensive, yet will focus on signi cant improvements or interesting aspects in certain areas of polymer chemistry. For this particular reason, not all transition metal-based polymerizations will be fully covered. Instead, besides providing a 'snapshot' of the state of the art, it was a major intention to outline the main advantages and disadvantages of certain important polymerizations in a critical, yet hopefully objective way.

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“…These catalysts produce polymers with uniform and controlled properties. Chiral metallocene catalysts possessing C2-symmetry have been widely studied in order to optimize, and to better understand, their ability to catalyze the stereoregular polymerization of propylene (Busico et al, 1998;Soga & Shiono, 1997). Ansa C2-symmetric metallocene catalysts are highly isoselective in propylene polymerization and have high activity.…”

Section: Introductionmentioning

confidence: 99%

Fractionation and Crystallization of Isotactic Polypropylenes Prepared Using Homogenous Metallocene Catalyst

Mokrani¹,

Amer²,

Reenen³

2015

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-15) Aug. 27-28, 2015 K

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A b s t r a c tA series of polypropylenes were prepared using rac-ethylene-bis (4,5,6,7-tetrahydro-1-indenyl) zirconium dichloride (Et(H4Ind) 2 ZrCl 2 (EI(4H)) as a homogeneous metallocene catalyst. The molecular weight of the polypropylene polymers was controlled using molecular hydrogen which was used as a transfer agent. To obtain materials with differing molecular weight and tacticities, polymers were fractionated with prep-TREF. Polypropylene polymers and fractions were fully characterized using various analytical techniques: differential scanning calorimetry (DSC), wide-angle X-ray diffraction (WAXD), 13 C nuclear magnetic resonance spectroscopy ( 13 C-NMR) and high temperature gel permeation chromatography (HT-GPC). It was found that the addition of molecular hydrogen to propylene polymerizations catalyzed using EI(4H) catalyst system resulted in a reduction in polymer molecular weight and isotacticity. Furthermore, the molecular weight, the isotacticity and the degree of crystallinity of the TREF fractions increased significantly with increasing elution temperature for all samples. Also, only the  crystal form existed in all TREF fractions of different samples.

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Ziegler-Natta catalysts for olefin polymerizations

Cited by 264 publications

References 71 publications

Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor

Study on Hydrogen Sensitivity of Ziegler–Natta Catalysts with Novel Cycloalkoxy Silane Compounds as External Electron Donor

Transition metal-based polymer chemistry: a critical micro-review

Fractionation and Crystallization of Isotactic Polypropylenes Prepared Using Homogenous Metallocene Catalyst

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