Addition Polymerization of Norbornene-Type Monomers Using Neutral Nickel Complexes Containing Fluorinated Aryl Ligands
| Autor: | Lester H. Mcintosh, Shyhchang S. Huang, Robert A. Shick, Brian L. Goodall, Susan Lenhard, Larry F. Rhodes, Dennis A. Barnes, K. T. Selvy, George M. Benedikt, Heather A. Kalamarides |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
inorganic chemicals
Polymers and Plastics Aryl Organic Chemistry Cationic polymerization chemistry.chemical_element Solution polymerization Inorganic Chemistry Nickel chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Addition polymer Lewis acids and bases Norbornene |
| Zdroj: | Macromolecules. 36:2623-2632 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma030001m |
| Popis: | The strong Lewis acid B(C6F5)3 was found to activate complexes of nickel toward the polymerization of norbornene-type monomers. The active species in this reaction is created by the transfer of C6F5 from boron to nickel. As a result, a class of neutral, single-component nickel complexes was developed containing two electron-withdrawing aryl ligands that polymerize norbornene and norbornenes with functional pendant groups. Active complexes include Ni(C6F5)2(PPh2CH2C(O)Ph), (η6-toluene)Ni(C6F5)2, and Ni(2,4,6-tris(trifluoromethyl)phenyl)2(1,2-dimethoxyethane). In the case of (η6-toluene)Ni(C6F5)2, isolation and characterization of low molecular weight norbornene polymers, using ethylene, indicated that each polymer chain contained a C6F5 headgroup. This points to the initiation step as being the insertion of norbornene into the Ni−C6F5 bond. The polymer microstructure as revealed by 1H and 13C NMR spectrometry is entirely different from that produced using the cationic nickel catalyst, [(η3-crotyl)Ni(1,4-CO... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|