Direct synthesis of fibrous high molecular weight polyethylene using vanadium catalysts supported on an SiO<sub>2</sub>ionic liquid system

Ochędzan‐Siodłak, Wioletta; Bihun, Anna

doi:10.1002/pi.4958

Cited by 9 publications

(16 citation statements)

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“…SEM images (Fig. 2c, d) of the copolymer sample with rather low NB incorporation (7 mol%) show that copolymer looses its fibrous feature, characteristic for polyethylene obtained on the same catalyst [32]. In addition, the irregular shape indicates that catalyst replication does not take place.…”

Section: Items 4 5)mentioning

confidence: 97%

“…Thus, the SIL systems combine the advantages of both homogeneous and heterogeneous catalysts while reducing their disadvantages [30]. The SIL systems can be successfully applied for ethylene polymerization [31][32][33]. The silica covered by imidiazolium or pyridinium chloroaluminate ionic liquid is applied as support of the zirconium, titanium, or vanadium catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Ochędzan‐Siodłak

Bihun

2016

Polym. Bull.

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Copolymerization of ethylene with norbornene (E/NB) and ethylene with 1-octene (E/Oct) is performed using supported ionic liquid (SIL) systems, in which metallocene (Cp 2 VCl 2 ) or post-metallocene [VCl 2 (salenCl 2 )] vanadium catalysts are immobilized in pyridinium chloroaluminate ionic liquid supported on silica. The studied SIL catalysts show higher activities as well as stability than their nonsupported analogues. In addition, higher activities and better comonomer incorporation are observed for norbornene (above 30 mol%). The comonomer incorporation has considerable influence on copolymer molecular weight (M w ), melting temperature, crystallinity degree, and microstructure of the copolymers. Molecularweight distribution is relatively narrow (1.5 B M w /M n B 3.0), which indicates the presence of single-site catalyst systems.

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Section: Items 4 5)mentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Ochędzan‐Siodłak

Bihun

2016

Polym. Bull.

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“…Ochedzan‐Siodlak, and Bihun reported a direct synthesis of fibrous high‐MW polyethylene using vanadium catalysts supported on SiO 2 ionic liquid system. Better performance of ethylene polymerization was observed when alkylaluminium activators (AlEt 2 Cl, AlEtCl 2 ) were applied, while methylaluminoxane (MAO) resulted in a decrease of the catalyst activity and molecular weight as well as in a broad MWD …”

Section: Introductionmentioning

confidence: 99%

Effect of Alkyl Aluminums on Ethylene Polymerization Reactions with a Cr‐V Bimetallic Catalyst

Bao

Tian

Jin

et al. 2018

Macro Reaction Engineering

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The effect of introducing various types of alkyl aluminums directly into the catalyst and/or in the polymerization process as cocatalyst on the efficiency of a Cr‐V bimetallic catalyst for ethylene polymerization is systematically investigated. Results indicate that polymerization activity, kinetic behavior, and polymer properties of the Cr‐V catalyst are strongly affected by using alkyl aluminums in different stages of polymerization, due to the different responses and sensitivities of the two metal centers to alkyl aluminum. When employed as cocatalyst, triisobutyl aluminum gives high activity and polyethylene with relatively low molecular weight, while diethylaluminum chloride cocatalyzes the production of ultra‐high molecular weight polyethylene but with very low activity. On the other hand, the pre‐reduction of the bimetallic catalyst by alkyl aluminums has a marked promotion effect on catalyst efficiency. It is suggested that the addition of alkyl aluminum to the catalyst and to the reactor as cocatalyst are more or less equivalent in their effects on the improvement of polymerization activity, but they behave in different ways to affect polymer properties.

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“…This method is widely used in reactions like hydroformylation, hydroamination, dehydrogenation, cycloaddition, Fischer esterification, transesterification or Friedel–Crafts alkylation and acylation . The concept of solid carrier covered by ionic liquid is also used as an alternative to conventional heterogenization of organometallic catalysts for olefin oligomerization and polymerization including production of PE …”

Section: Introductionmentioning

confidence: 99%

“…In our previous studies concerning ethylene polymerization, the SIL system was obtained by modification of an amorphous mesoporous silica using imidazolium ethylchloroaluminate ionic liquid and successfully applied to immobilize both metallocene catalysts (Cp 2 TiCl 2 , Cp 2 ZrCl 2 ) and post‐metallocene catalysts (Sal‐Ti and FI‐Ti) . Application of the Cp 2 VCl 2 catalyst resulted in a high‐molecular‐weight PE with an unusual structure in the form of fibres . Unfortunately, the polymerization yield was low.…”

Section: Introductionmentioning

confidence: 99%

Ethylene polymerization using vanadium catalyst supported on silica modified by pyridinium ionic liquid

Ochędzan‐Siodłak

Bihun

Olszowy

et al. 2016

Polymer International

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Vanadium catalyst systems (SIL1–3A(B)/V) for ethylene polymerization were obtained by immobilization of the Cp2VCl2 precursor (V) in the ionic liquid 1‐[3‐(triethoxysilyl)propyl]pyridinium chloride (IL), modified by AlCl3 and AlEtCl2 (A) or AlEt2Cl (B), and supported on three types of silica carrier S1–3. The properties of the ionic liquid supports were determined using Fourier transform infrared spectroscopy, Brunauer–Emmett–Teller measurements, scanning electron microscopy and elemental analysis. The best results (above 2 tons PE (mol V)−1 (0.5 h)−1) were obtained using the catalyst system SIL3B/V. Addition of ethyl trichloroacetate is possible in the ionic liquid medium and it further increases the activity up to 7 tons PE (mol V)−1 (0.5 h)−1. In contrast, application of the imidazolium ionic liquid to the SIL system or application the analogous catalyst system without the ionic liquid results in lower activities. The obtained polyethylene (PE) is a linear polymer, with molecular weight (Mw) of over 106 g mol−1 and molecular weight distribution (Mw/Mn) in the range 1.6–1.9, and has a characteristic fluffy or fibrous shape. In contrast, the PE samples obtained using the systems without ionic liquid reveal broader Mw/Mn (2.5–3.7) and replicate the support morphology. © 2016 Society of Chemical Industry

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Direct synthesis of fibrous high molecular weight polyethylene using vanadium catalysts supported on an SiO₂ionic liquid system

Abstract: The produced fibrous polyethylene has high molecular weight and narrow molecular weight distribution. This specific junction of both features seems to come from the applied catalysts and SIL strategy.

Cited by 9 publications

References 63 publications

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Effect of Alkyl Aluminums on Ethylene Polymerization Reactions with a Cr‐V Bimetallic Catalyst

Ethylene polymerization using vanadium catalyst supported on silica modified by pyridinium ionic liquid

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Direct synthesis of fibrous high molecular weight polyethylene using vanadium catalysts supported on an SiO2ionic liquid system

Abstract: The produced fibrous polyethylene has high molecular weight and narrow molecular weight distribution. This specific junction of both features seems to come from the applied catalysts and SIL strategy.

Cited by 9 publications

References 63 publications

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Copolymerization of ethylene with norbornene or 1-octene using supported ionic liquid systems

Effect of Alkyl Aluminums on Ethylene Polymerization Reactions with a Cr‐V Bimetallic Catalyst

Ethylene polymerization using vanadium catalyst supported on silica modified by pyridinium ionic liquid

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Direct synthesis of fibrous high molecular weight polyethylene using vanadium catalysts supported on an SiO₂ionic liquid system