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Помогите пожалуйста:

1. New Evidence on the Nature of the Active Sites in Heterogeneous Ziegler−Natta Catalysts for Propene Polymerization
Vincenzo Busico , Roberta Cipullo and Giovanni Talarico, Anna Laura Segre, John C. Chadwick
Macromolecules, 1997, 30 (16), pp 4786–4790

DOI:

http://dx.doi.org/10.1021/ma9704673

2. Bulk propylene polymerization in the presence of ansa-metallocenes of C2 and C1 symmetries: From a rigid thermoplastic to elastomeric stereoblock polypropylene
P. M. Nedorezova, E. N. Veksler, A. M. Aladyshev, V. I. Tsvetkova, V. A. Optov, G. P. Brusova and D. A. Lemenovskii
Kinetics and Catalysis
Volume 47, Number 2 (2006), 245-250

DOI:

http://dx.doi.org/10.1134/S0023158406020145

3. Site selective ligand modification and tactic variation in polypropylene chains produced with metallocene catalysts
Abbas Razavia, Ulf Thewalt
Coordination Chemistry Reviews
Volume 250, Issues 1–2, January 2006, Pages 155–169

DOI:

http://dx.doi.org/10.1016/j.ccr.2005.07.006

4. Chain “stationary” insertion mechanism and production of isotactic polypropylene with C1 symmetric catalyst systems
A.Razavi, V. Bellia, D. Baekelmans, M. Slawinsky, S. Sirol, L. Peters and Ulf Thewalt
Kinetics and Catalysis
Volume 47, Number 2 (2006), 257-267

DOI:

http://dx.doi.org/10.1134/S0023158406020169

Заранее огромное спасибо!

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