Polymerisation of Acrylates Catalysed by Methylaluminoxane Activated Ditertiary Phosphine Complexes of Iron and Cobalt Dichlorides
✍ Scribed by Pascal M. Castro; Mikko P. Lankinen; Markku Leskelä; Timo Repo
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 142 KB
- Volume
- 206
- Category
- Article
- ISSN
- 1022-1352
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
Summary: Diphosphane complexes of iron(II) are active catalysts for the polymerisation of methyl acrylate (MA) monomers in the presence of methylaluminoxane (MAO). High molar mass atactic MA polymers ($\overline M _{\rm n}$ ∼ 200 kg/mol) were obtained under mild conditions with relatively narrow polydispersities (PDI ∼ 2). Polymerisation activity and polymer molar masses are strongly dependent on the ligand frame. The polymerisation requires the coordination of MA to a vacant coordination site at the metal centre, and processes with chain‐transfer to aluminium. Cobalt analogues proved to be less efficient catalysts, giving activities in the range of 50–250 kg/mol · h instead of 200–450 kg/mol · h for the iron complexes. MAO activated FeCl~2~ and CoCl~2~ salts also perform the polymerisation of MA with low activity.
Ditertiary phosphine complex of iron(II) chloride as methyl acrylate polymerisation catalyst.
imageDitertiary phosphine complex of iron(II) chloride as methyl acrylate polymerisation catalyst.