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Neodymium tris-diarylphosphates: Systematic study of the structure–reactivity relationship in butadiene and isoprene polymerisation

Paper ID Volume ID Publish Year Pages File Format Full-Text
39691 45831 2014 9 PDF Available
Title
Neodymium tris-diarylphosphates: Systematic study of the structure–reactivity relationship in butadiene and isoprene polymerisation
Abstract

•Structure–activity relationship in neodymium-catalysed polymerisation of dienes.•Synthesis of tris-aryl phosphates of neodymium was elaborated.•A number of tris-aryl phosphates of neodymium were obtained.•The optimal neodymium tris-aryl phosphate catalyst was identified.

The catalytic properties of neodymium tris-phosphates with various diarylphosphate ligands in the stereoregular 1,4-cis-polymerisation of butadiene and isoprene were studied. The considerable variability of the diaryl phosphate structure allowed for the systematic investigation of the dependence of the catalytic properties of neodymium tris-diarylphosphates on the electronic and steric properties of the ligand. Electron-withdrawing substituents (F, Cl, Br) in the aryl moiety increased the catalyst activity of tris-diarylphosphate. Neodymium aryl phosphates containing lipophilic bulky ligands provided the synthesis of polydienes with a monomodal molecular-weight distribution. The optimal catalytic properties demonstrated that the neodymium aryl phosphate prepared from bis(2,6-dimethyl-4-tert-butylphenyl)-phosphoric acid showed high activity and ensured a monomodal MWD of polydienes (Mw/Mn ∼ 2 for polybutadiene and Mw/Mn ∼ 3 for polyisoprene) in various conditions.

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Keywords
Neodymium polymerisation; Structure–activity relationship; Aryl phosphate; Structurally rigid ligand; 1,3-Butadiene; Polybutadiene; Isoprene; Polyisoprene
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Neodymium tris-diarylphosphates: Systematic study of the structure–reactivity relationship in butadiene and isoprene polymerisation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 478, 20 May 2014, Pages 219–227
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us