In:
Journal of Polymer Science Part B: Polymer Physics, Wiley, Vol. 44, No. 4 ( 2006-02-15), p. 747-755
Abstract:
All relevant 13 C NMR signals of two series of seven homogeneous ethylene–propylene copolymers were used to fit the second‐order Markov reactivity ratios of the catalysts and the theoretical feeds. The copolymers cover a very broad range of comonomer incorporations, from about 10 to 93%, and show only primary (1,2) insertions. For both series, solutions are found with reliabilities 〉 〉 99.5%. The reactivity ratios, r 112 = 2.54, r 121 = 0.12, r 212 = 2.05, and r 221 = 0.29 for the used Zirconocone and r 112 = 1.69, r 121 = 0.32, r 212 = 1.56, and r 221 = 0.51 for the hafnocene, provide direct information about the metallocenes, the kinetics, and the chain microstructure. With these results, the direct peak method demonstrates that the use of all relevant 13 C NMR peaks enables accurate second‐order Markov modeling, revealing subtle differences between copolymers. © 2006 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 44: 747–755, 2006
Type of Medium:
Online Resource
ISSN:
0887-6266
,
1099-0488
Language:
English
Publisher:
Wiley
Publication Date:
2006
detail.hit.zdb_id:
1473448-5
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