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Propylene polymerization with nickel–diimine complexes containing pseudohalides
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dias, Marcos L. Silva, Luciana Portela Da Crossetti, Geraldo Lopes Galland, Griselda Ligia Barrera Filgueiras, Carlos Alberto Lombardi Ziglio, Cláudio Marcos |
| Copyright Year | 2006 |
| Abstract | DADNiX2 nickel–diimine complexes [DAD = 2,6-iPr2C6H3NC(Me)C(Me)N2,6-iPr2C6H3] containing nonchelating pseudohalide ligands [X = isothiocyanate (NCS) for complex 1 and isoselenocyanate (NCSe) for complex 2] were synthesized, and the propylene polymerization with these complexes and also with the Br ligand (X = Br for complex 3) activated by methylaluminoxane (MAO) were investigated (systems 1, 2, and 3/MAO). The polypropylenes obtained with systems 1, 2, and 3 were amorphous polymers and had high molecular weights and narrow molecular weight distributions. Catalyst system 1 showed a relatively high activity even at a low Al/Ni ratio and reached the maximum activity at the molar ratio of Al/Ni = 500, unlike system 3. Increases in the reaction temperature and propylene pressure favored an increase in the catalytic activity. The spectra of polypropylenes looked like those of propylene–ethylene copolymers containing syndiotactic propylene and ethylene sequences. At the same temperature and pressure, system 2 presented the highest number of propylene sequences, and system 3 presented the lowest. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 44: 458–466, 2006 |
| Starting Page | 458 |
| Ending Page | 466 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.1002/pola.21013 |
| Alternate Webpage(s) | http://quimicanova.sbq.org.br/imagebank/pdf/AR20180009.pdf |
| Alternate Webpage(s) | https://doi.org/10.1002/pola.21013 |
| Volume Number | 44 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
