Titanium catalyst (TiCl4) supported on MgCl2(THF)(AlEt2Cl)0,34 for ethylene polymerization

Nowakowska, Maria

doi:10.14314/polimery.2007.184

Cited by 9 publications

(7 citation statements)

References 8 publications

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“…All these systems have been continually inspiring researchers to elaborate better and better catalysts [e.g. [1][2][3][4][5][6]. The revolutionary development of the catalytic systems can be considered as the key of huge evolution within the field of olefins' polymerization processes [7][8][9][10].…”

Section: Catalysts For Low-pressure Polymerization Of Olefins -Classimentioning

confidence: 99%

Metal salen complexes as ethylene polymerization catalysts - effect of catalytic system composition on its activity and properties of polymerization products

Białek

Czaja²

2008

Polimery

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Metal salen complexes as ethylene polymerization catalystseffect of catalytic system composition on its activity and properties of polymerization productsSummary -The series of salen-type complexes differing in the metal center (M = Ti, Zr, V) and in the coordination spheres (different substituent at salen ligands) after activation with methylalumoxane (MAO) or Et2AlCl were studied as catalytic systems in ethylene polymerization. The vanadium and titanium complexes were found to be more active in combination with alkylaluminum compound (Et 2 AlCl) then with MAO, while zirconium complex was active only in combination with MAO. The activity of complexes activated by Et2AlCl decreases in the order V > Ti >> Zr ≅ 0, and when MAO is used as the cocatalyst the activity changes the order: Ti > Zr > V. The substituent type in the salen ligand also affects the catalyst activity; the best results were obtained for the catalyst having Cl or Br as substituents. The type of substituent has no significant effect on polyethylene properties, while the type of cocatalyst and the type of metallic centre play here the essential role. The salen titanium complexes in combination with Et2AlCl usually produce low molecular weight polyethylene with narrow polydispersity, also accompanied by oligomers. Other catalytic systems give linear high molecular weight polyethylene (M w = 200 000-700 000).

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Section: Catalysts For Low-pressure Polymerization Of Olefins -Classimentioning

confidence: 99%

Metal salen complexes as ethylene polymerization catalysts - effect of catalytic system composition on its activity and properties of polymerization products

Białek

Czaja²

2008

Polimery

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“…A high degree of crystallity (87-96 %) is another distinguishable physical feature of PE obtained. It should be noted that PE obtained with use of heterogeneous titanium catalyst supported on modified MgCl 2 , showed much lower degree of crystallity (55-68 %) [10]. This is important from a technological point of view, as a higher degree of crystallity is related to better mechanical properties of plastics such as elasticity, impact strength, and abrasion resistance.…”

Section: Polyethylene Propertiesmentioning

confidence: 95%

Chloroaluminate ionic liquids as a medium of titanocene catalyst activated by alkyl aluminum compounds for ethylene polymerization

Ochędzan‐Siodłak

Pawelska²

2008

Polimery

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Chloroaluminate ionic liquids as a medium of titanocene catalyst activated by alkyl aluminum compounds for ethylene polymerization Summary-1-Ethyl-3-methylimidazolium tetrachloroaluminate ([EMIM] + [AlCl4]-) and 1-n-butyl-3-methylimidazolium tetrachloroaluminate ([BMIM] + [AlCl 4 ]-) ionic liquids were applied in biphasic ethylene polymerization as a medium of Cp 2 TiCl 2 titanocene catalyst. The effects of alkylaluminum compound (MAO, AlEt 3 , AlEt 2 Cl, AlEtCl 2), the activator/catalyst molar ratio, polymerization time, ethylene pressure, catalyst recycling and the volume of the ionic liquid/hexane medium on the polymerization yield were investigated. Physical properties of polyethylene (PE) obtained are presented. It was shown that AlEtCl2 is the best activator investigated so far. The [BMIM] + [AlCl4]ionic liquid is a better medium for the titanocene catalyst than [EMIM] + [AlCl4]one. The product obtained is characterized primarily by its high crystallity degree and shows the properties of a typical linear polyethylene. Thus, biphasic ionic liquid polymerization of ethylene can be a potential alternative to that with a metallocene catalyst immobilized on a solid carrier.

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“…They also have chemically reactive groups on the surface, most of which are within the pore structure. Their particles size and shapes are often controlled to optimize catalyst performance [10,11,12]. However, the disadvantage of SiO 2 -supported ZN catalyst is their low activity [12].…”

Section: Introductionmentioning

confidence: 99%

“…Their particles size and shapes are often controlled to optimize catalyst performance [10,11,12]. However, the disadvantage of SiO 2 -supported ZN catalyst is their low activity [12]. The catalytic activity of SiO 2 -supported Ziegler-Natta catalysts can be improved by addition of MgCl 2 .…”

Section: Introductionmentioning

confidence: 99%

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

2011

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MgCl2-SiO2/TiCl4 Ziegler-Natta catalysts for ethylene polymerization were prepared by impregnation of MgCl2 on SiO2 in heptane and further treatment with TiCl4. MgCl2·nEtOH adduct solutions were prepared with various EtOH/MgCl2 molar ratios for preparation of the MgCl2-supported and MgCl2-SiO2-supported catalysts in order to investigate the effect on polymerization performance of both catalyst systems. The catalytic activities for ethylene polymerization decreased markedly with increased molar ratios of [EtOH]/[MgCl2] for the MgCl2-supported catalysts, while for the bi-supported catalysts, the activities only decreased slightly. The MgCl2-SiO2-supported catalyst had relatively constant activity, independent of the [EtOH]/[MgCl2] ratio. The lower [EtOH]/[MgCl2] in MgCl2-supported catalyst exhibited better catalytic activity. However, for the MgCl2-SiO2-supported catalyst, MgCl2 can agglomerate on the SiO2 surface at low [EtOH]/[MgCl2] thus not being not suitable for TiCl4 loading. It was found that the optimized [EtOH]/[MgCl2] value for preparation of bi-supported catalysts having high activity and good spherical morphology with little agglomerated MgCl2 was 7. Morphological studies indicated that MgCl2-SiO2-supported catalysts have good morphology with spherical shapes that retain the morphology of SiO2. The BET measurement revealed that pore size is the key parameter dictating polymerization activity. The TGA profiles of the bi-supported catalyst also confirmed that it was more stable than the mono-supported catalyst, especially in the ethanol removal region.

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Titanium catalyst (TiCl4) supported on MgCl2(THF)(AlEt2Cl)0,34 for ethylene polymerization

Cited by 9 publications

References 8 publications

Metal salen complexes as ethylene polymerization catalysts - effect of catalytic system composition on its activity and properties of polymerization products

Metal salen complexes as ethylene polymerization catalysts - effect of catalytic system composition on its activity and properties of polymerization products

Chloroaluminate ionic liquids as a medium of titanocene catalyst activated by alkyl aluminum compounds for ethylene polymerization

Effect of EtOH/MgCl2 Molar Ratios on the Catalytic Properties of MgCl2-SiO2/TiCl4 Ziegler-Natta Catalyst for Ethylene Polymerization

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