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Investigation of methyl methacrylate and vinyl acetate polymerization promoted by Al(Bu-i)(3)/2,2 '-bipyridine and Al(Bu-i)(3)/2,2 '-bipyridine/TEMPO complexes
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UNSPECIFIED (1998) Investigation of methyl methacrylate and vinyl acetate polymerization promoted by Al(Bu-i)(3)/2,2 '-bipyridine and Al(Bu-i)(3)/2,2 '-bipyridine/TEMPO complexes. MACROMOLECULES, 31 (21). pp. 7133-7141. ISSN 0024-9297
Full text not available from this repository.Abstract
Results of methyl methacrylate (MMA) and vinyl acetate (VOAc) polymerization using the Al(Bu-i)(3)/2,2'-bipyridine/TEMPO initiating system at room temperature failed to confirm the "living" radical mechanism reported earlier. Several species apparently propagate without control in a normal free radical process and only above a critical initiator concentration. No evidence was found for the penta- and hexacoordinated aluminum species previously suggested, but high conversion to an alkoxyamine was observed. Additionally, mixing Al(Bu-i)(3) and BIPY promotes a variety of reactions involving alkyl and hydride transfers to the aromatic rings forming reduced BIPY products, along with a persistent organoaluminum radical. All these results illustrate that the process is considerably more complicated than postulated before. Conversely, at -78 degrees C, a single active species excluding the participation of TEMPO has been put, in evidence, displaying some "living" characteristics. Several experiments support its anionic nature, as previously suggested by Ikeda.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry |
| Journal or Publication Title: | MACROMOLECULES |
| Publisher: | AMER CHEMICAL SOC |
| ISSN: | 0024-9297 |
| Date: | 20 October 1998 |
| Volume: | 31 |
| Number: | 21 |
| Number of Pages: | 9 |
| Page Range: | pp. 7133-7141 |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/15261 |
Data sourced from Thomson Reuters' Web of Knowledge
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