Aqueous Homo- and Copolymerization of Ethylene by Neutral Nickel (II) Complexes

Bauers, Florian Martin; Mecking, Stefan

Aqueous Homo- and Copolymerization of Ethylene by Neutral Nickel (II) Complexes

Dateien

2001_Macromolecules_34_1165_Mecking.pdfGröße: 96.46 KBDownloads: 570

Datum

2001

Autor:innen

Bauers, Florian Martin

Mecking, Stefan

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Chemie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Macromolecules. 2001, 34(5), pp. 1165-1171. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma001704w

Zusammenfassung

Aqueous coordination polymerization of ethylene by different neutral nickel(II) complexes [(X^O)NiR(L)] (X = P: type 1; X = N: type 2) was investigated. With catalyst precursors of type 1, productivities and molecular weights were reduced by comparison to conventional polymerization in organic solvents. This effect results to a large extent from a lowering of the chain growth rate due to a low concentration of ethylene at the catalytically active centers in the aqueous polymerization. The catalysts are stable in water for hours. Stable latices of low-molecular-weight linear polyethylene were obtained with a hydrophilic complex of type 1 in an emulsion-type polymerization (Mw ca. 3 x 1000 g mol-1, Mw/Mn 2-3; solids content of polymer dispersions up to 10%). With complexes of type 2, productivities in aqueous ethylene polymerization were also reduced by comparison to polymerization in organic solvents. However, moderately branched semicrystalline polymers of high molecular weight are accessible (Mn > 104 g mol-1). Employing norbornene as a comonomer, high-molecular-weight amorphous copolymers were obtained in water as a reaction medium. Ethylene solubility in water-acetone mixtures was estimated experimentally.

Fachgebiet (DDC)

540 Chemie

Zitieren

ISO 690

BAUERS, Florian Martin, Stefan MECKING, 2001. Aqueous Homo- and Copolymerization of Ethylene by Neutral Nickel (II) Complexes. In: Macromolecules. 2001, 34(5), pp. 1165-1171. ISSN 0024-9297. eISSN 1520-5835. Available under: doi: 10.1021/ma001704w

BibTex

@article{Bauers2001Aqueo-9909,
  year={2001},
  doi={10.1021/ma001704w},
  title={Aqueous Homo- and Copolymerization of Ethylene by Neutral Nickel (II) Complexes},
  number={5},
  volume={34},
  issn={0024-9297},
  journal={Macromolecules},
  pages={1165--1171},
  author={Bauers, Florian Martin and Mecking, Stefan}
}

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    <dcterms:abstract xml:lang="eng">Aqueous coordination polymerization of ethylene by different neutral nickel(II) complexes [(X^O)NiR(L)] (X = P: type 1; X = N: type 2) was investigated. With catalyst precursors of type 1, productivities and molecular weights were reduced by comparison to conventional polymerization in organic solvents. This effect results to a large extent from a lowering of the chain growth rate due to a low concentration of ethylene at the catalytically active centers in the aqueous polymerization. The catalysts are stable in water for hours. Stable latices of low-molecular-weight linear polyethylene were obtained with a hydrophilic complex of type 1 in an emulsion-type polymerization (Mw ca. 3 x 1000 g mol-1, Mw/Mn 2-3; solids content of polymer dispersions up to 10%). With complexes of type 2, productivities in aqueous ethylene polymerization were also reduced by comparison to polymerization in organic solvents. However, moderately branched semicrystalline polymers of high molecular weight are accessible (Mn &gt; 104 g mol-1). Employing norbornene as a comonomer, high-molecular-weight amorphous copolymers were obtained in water as a reaction medium. Ethylene solubility in water-acetone mixtures was estimated experimentally.</dcterms:abstract>
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