Synthesis of branched polyethylenes by the tandem catalysis of silica‐supported linked cyclopentadienyl‐amido titanium catalysts and a homogeneous dibromo nickel catalyst having a pyridylimine ligand

Musikabhumma, Kittichote; Spaniol, Thomas P.; Okuda, Jun

doi:10.1002/pola.10597

Cited by 44 publications

(24 citation statements)

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“…Moreover, due to their good compatibility with various early and late metal copolymerization catalysts, (imino)pyridyl metal complexes can be used as oligomerization catalysts in tandem catalytic systems for the production in situ of ethylene-olefin copolymers (LLDPEs) as well as in reactor blending to give PEs with controlled molecular weight distribution [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Olefin oligomerization, homopolymerization and copolymerization by late transition metals supported by (imino)pyridine ligands

Bianchini

Giambastiani

Luconi

et al. 2010

Coordination Chemistry Reviews

298

147

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Section: Introductionmentioning

confidence: 99%

Olefin oligomerization, homopolymerization and copolymerization by late transition metals supported by (imino)pyridine ligands

Bianchini

Giambastiani

Luconi

et al. 2010

Coordination Chemistry Reviews

298

147

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“…In this process, one catalyst oligomerizes the ethylene to an α-olefin, and the other is responsible for polymerizing the ethylene and incorporating the α-olefin into the growing polymer chain. Many contributions [5][6][7][8][9][10][11][12][13][14] such as the bi- …”

mentioning

confidence: 99%

Investigation on chain structure of LLDPE obtained by ethylene in-situ copolymerization with DSC and XRD

Wang

Yan

2007

CHINESE SCI BULL

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Thermal segregations of LLDPE were treated with successive self-nucleation/annealing (SSA) on differential scanning calorimetry (DSC). Information on molecular heterogeneity of LLDPE was obtained. After SSA was treated, the multiple endothermic peaks were observed in the DSC thermograms during heating experiment. It is obtained that the thickness of different lamellas formed by segments of various lengths was 4-10 nm. X-ray diffraction (XRD) results showed that the crystallites dimensions of various reflections were about several dozens of nanometers. The ethylene/α-olefin copolymers and the copolymer via in-situ copolymerization were similar to each other for molecular heterogeneity and XRD characteristics, which revealed that it was possible to use the ethylene/α-olefin copolymers to simulate the copolymer via in-situ copolymerization of ethylene to simplify the complexity of the structure of the ethylene in-situ copolymer.LLDPE via in-situ copolymerization, ethylene and α-olefin copolymers, thermal segregation, XRD, DSC Linear low density polyethylenes (LLDPE) are commercially important polymers and are produced via copolymerization of ethylene and α-olefins such as 1-butene, 1-hexene, and 1-octene. Their properties are greatly influenced by various factors. The molecular structure of LLDPE has been investigated from different angles, such as the average content of comonomer, the intramolecular comonomer sequence distribution, and the distribution of comonomer among polymer chains, in addition to average molecular weights and molecular weight distribution. Halasz et al. [1] studied a series of ethylene/1-pentene, ethylene/1-hexene, and ethylene/1-octene copolymers and concluded that the melting temperatures and the crystallinity decrease with increasing chain length of the comonomer and the comonomer content. Moreover, they have investigated the crystallization kinetics of these copolymers. By investigating LLDPE resins based on 1-butene, 1-hexene and 1-octene, Gupta et al. [2] studied the effect of short chain length on the mechanical properties, and found that at higher deformation rates (ca. 1 m/s), the breaking strength of these films increased with increasing short chain branch length. Pan et al. [3] investigated the effect of branched structures on the performances of the copolymers synthesized from ethylene and 1-hexene, 1-decene and 1-tetradecene and 1-octadecene, respectively and found that 16-carbon side branch could co-crystallize effectively with backbone chain at low α-olefin incorporation, which is different from Yoon's result [4] .Recently, much attention has been paid to tandem catalysis of LLDPE production, involving the use of a single feed of ethylene and two catalysts. In this process, one catalyst oligomerizes the ethylene to an α-olefin, and the other is responsible for polymerizing the ethylene and incorporating the α-olefin into the growing polymer chain. Many contributions [5][6][7][8][9][10][11][12][13][14] such as the bi-

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“…[8][9][10][11] By simple modifications of the iminopyridyl architecture, the polymerization and/or oligomerization activities of the metal complexes can be tuned. All these merits make this class of complexes advantageous over other types of metal catalyst, such as metallocenes or geometry constrained species [12][13][14][15] . Consequently, synthesis of iminopyridyl based ligands has been a major research target in polymerization catalysis and there have been some studies with asymmetrical iminopyridyl based ligands 9,11,16 and also with long chain aliphatic substituents at the imino nitrogen atom.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of some water soluble Zn(ii) complexes with (E)-N-(pyridin-2-ylmethylene)arylamines that regulate tumour cell death by interacting with DNA

et al. 2014

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The synthesis and spectroscopic properties of nine water soluble zinc(II) complexes of (E)-N-(pyridin-2-ylmethylene)arylamines (Ln) with the general formula [Zn(X)2(Ln)] (X = Cl−, Br−, I−; (1-8)) and [Zn(-N3)-(N3)(L3)]2 (9) are reported. The complexes were characterized by elemental analysis and their spectroscopic properties were studied using UV-Visible, fluorescence, IR and 1H NMR spectroscopies. The solid state structures of zinc(II) complexes 2-4 and 6-9 were established by single crystal X-ray crystallography. The majority of the structures are mononuclear with tetra-coordinate zinc centres (2-4, 6 and 7) except where L carries an additional donor atom capable of coordinating zinc (8), in which case the zinc atom has a distorted square pyramidal geometry. The centrosymmetric molecule of [Zn(-N3)(N3)(L3)]2 (9) is binuclear with the zinc atoms in a trigonal bipyramidal coordination environment. In general, the dichlorozinc derivatives 1, 3-5 and 8 exhibited moderately elevated in vitro cytotoxic potency towards the human epithelial cervical carcinoma (HeLa) cell line, with 4 as the best performer (IC50 value of 18 M). Apoptosis-inducing activity, assessed by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay, showed that the zinc complexes interacted with DNA and thereby interfered the DNA binding of several transcription factors to its promoter sites, thus inhibiting gene transcription required for the biological activity of cells. Accepted ManuscriptThis is an Accepted Manuscript, which has been through the RSC Publishing peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, which is prior to technical editing, formatting and proof reading. This free service from RSC Publishing allows authors to make their results available to the community, in citable form, before publication of the edited article. This Accepted Manuscript will be replaced by the edited and formatted Advance Article as soon as this is available.To cite this manuscript please use its permanent Digital Object Identifier (DOI®), which is identical for all formats of publication.More information about Accepted Manuscripts can be found in the Information for Authors.Please note that technical editing may introduce minor changes to the text and/or graphics contained in the manuscript submitted by the author(s) which may alter content, and that the standard Terms & Conditions and the ethical guidelines that apply to the journal are still applicable. In no event shall the RSC be held responsible for any errors or omissions in these Accepted Manuscript manuscripts or any consequences arising from the use of any information contained in them. www.rsc.org/dalton ISSN 1477-9226 Dalton TransactionsAn international journal of inorganic chemistry 1477-9226(2010)

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Synthesis of branched polyethylenes by the tandem catalysis of silica‐supported linked cyclopentadienyl‐amido titanium catalysts and a homogeneous dibromo nickel catalyst having a pyridylimine ligand

Cited by 44 publications

References 25 publications

Olefin oligomerization, homopolymerization and copolymerization by late transition metals supported by (imino)pyridine ligands

Olefin oligomerization, homopolymerization and copolymerization by late transition metals supported by (imino)pyridine ligands

Investigation on chain structure of LLDPE obtained by ethylene in-situ copolymerization with DSC and XRD

Synthesis and characterization of some water soluble Zn(ii) complexes with (E)-N-(pyridin-2-ylmethylene)arylamines that regulate tumour cell death by interacting with DNA

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