Polymerization of methyl methacrylate using zirconocene initiators: Polymerization mechanisms and applications

Macromolecules

Volumn 30, Issue 7, 1997, Pages 1875-1883

  Li, Yufang ^a   Ward, David G ^a   Reddy, Srinivasa S ^a   Collins, Scott ^a  

^a UNIVERSITY OF WATERLOO   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

ALUMINUM COMPOUNDS; CHEMICAL ACTIVATION; COORDINATION REACTIONS; IMPURITIES; INITIATORS (CHEMICAL); MASS SPECTROMETRY; MOLECULAR WEIGHT DISTRIBUTION; MONOMERS; POLYMERIZATION; REACTION KINETICS; SOLVENTS; ZIRCONIUM COMPOUNDS;

TRIISOBUTYLALUMINUM; ZIRCONOCENE;

POLYMETHYL METHACRYLATES;

EID: 0031557625     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma961472u     Document Type: Article

References (22)

1. Collins, S.; Ward, D. G. J. Am. Chem. Soc. 1992, 114, 5461.
2. s observed, it is not clear what relationship exists, if any, to the present system. Benedek, I.; Simionescu, C.; Asandei, N.; Ungurenasu, C. Eur. Polym. J. 1969, 5, 449.
3. Yasuda, H.; Yamamoto, H.; Yokota, K.; Miyake, S.; Nakamura, A. J. J. Am. Chem. Soc. 1992, 114, 4908.
4. Yasuda, H.; Tamai, H Prog. Polym. Sci. 1993, 18, 1097. For some related work, see: Novak, B. M.; Boffa, L. S. Macromolecules 1994, 27, 6993.
5. Yasuda, H.; Tamai, H Prog. Polym. Sci. 1993, 18, 1097. For some related work, see: Novak, B. M.; Boffa, L. S. Macromolecules 1994, 27, 6993.
6. Soga, K.; Deng, H.; Yano, T.; Shiono, T. Macromolecules 1994, 27, 7938.
7. (a) Collins, S.; Ward, D. G.; Suddaby, K. Macromolecules 1994, 27, 7222.
8. (b) Deng, H.; Shiono, T.; Soga, K. Macromolecules 1995, 28, 3067.
9. (c) Giardello, M. A.; Yamamoto, Y.; Brard, L.; Marks, T. J. J. Am. Chem. Soc. 1995, 117, 3236.
10. 4] at low temperatures has been observed: see ref 1 and Ward, D. G. Ph.D. Thesis, University of Waterloo, August 1995.
11. Curtis, M. D.; Thanedar, S.; Butler, W. M. Organometallics 1984, 3, 1855.
12. Protonolysis of complexes such as 5 led to selective cleavage of the Zr-O bond, thus necessitating an approach involving a bis(enolate) precursor. Ward, D. G. Ph.D Thesis, University of Waterloo, August 1995.
13. Cationic enolate complexes such as 3 are not particularly stable and decompose in solution to, inter alia, cationic alkoxide complexes; this may account for the broader MWDs observed in polymerizations employing these initiators. Ward, D. G. Ph.D. Thesis, University of Waterloo, August 1995.
14. We have been unable to detect curvature in the (MMA) va t plots at high conversion. This implies that the second step is not only fast, but this equilibrium favors the formation of 2-MMA in the presence of a large excess of PMMA. This may be due to a combination of steric and, perhaps more importantly, electronic effects as MMA can stabilize the positive charge on the metal more effectively (through delocalization) than a simple ester.
15. Jordan, R. F.; Dasher, W. B.; Echols, S. F. J. Am. Chem. Soc. 1986, 180, 1718.
16. Allen, R. D.; Long, T. E.; McGrath, J. E. Polym. Bull. 1986, 15, 127.
17. Fayt, R; Forte, R.; Jacobs, C.; Jérôme, R.; Ouhadi, T.; Teyssié, Ph.; Varshney, S. K. Macromolecules 1987, 20, 1442.
18. Thomson, B.; Wang, Z.; Paine, A.; Rudin, A.; Lejoie, G. J. Am. Oil Chem. Soc. 1995, 72, 11.
19. Wailes, P. C.; Weigold, H.; Bell, A. P. J. Organomet, Chem. 1972, 34, 162.
20. Wailes, P. C.; Weigold, H.; Bell, A. P. J. Organomet. Chem. 1971, 33, 181.
21. Amorose, D. M.; Lee, R. A.; Petersen, J. L. Organometallics 1991, 10, 2191.
22. Kim, Y. J.; Bernstein, M. P.; Galiano Roth, A. S.; Romesberg, F. E.; Williard, P. G.; Fuller, D. J.; Harrison, A. T.; Collum. D. B. J. Org. Chem. 1991, 56, 4435.