Mechanism of Olefin Polymerization on Supported Ziegler–Natta Catalysts Based on Data on the Number of Active Centers and Propagation Rate Constants Full article
| Journal |
Kinetics and Catalysis
ISSN: 0023-1584 , E-ISSN: 1608-3210 |
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| Output data | Year: 2005, Volume: 46, Number: 2, Pages: 166-176 Pages count : 11 DOI: 10.1007/s10975-005-0065-0 | ||
| Tags | Propylene; Active Center; Phthalate; C3H6; Diffusion Limitation | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | ExxonMobil |
Abstract:
The number of active centers (C g) and propagation rate constants (k g) for the polymerization of propylene and ethylene on highly active titanium-magnesium catalysts (TMCs) of different compositions at 70°C were determined using the method of 14CO inhibition of polymerization. In the polymerization of propylene on the TiCl4/D1/MgCl2-AlEt3/D2 system (D1 is dibutyl phthalate or 2,2′-diisobutyl-1,3-dimethoxypropane; D2 is a silane), the effects of D1 and D2 donors on the values of C g and k g were studied. It was found that the donors decreased the values of k g for nonstereospecific centers, had no effect on the values of k g for stereospecific centers, and increased the fraction of stereospecific centers, as well as the fraction of “sleeping” centers regardless of their stereospecificity. The rate constants of isotactic-chain transfer with C3H6, AlEt3, H2,and ZnEt2 were determined. In the polymerization of ethylene, a number of TMCs exhibited strong diffusion limitations, which manifested themselves in a dramatic decrease in the determined values of k g. It was demonstrated that diffusion limitations can be removed by decreasing the particle size and the concentration of active centers and by performing prepolymerization with propylene. The values of k g in ethylene polymerization were similar for stereospecific and nonstereospecific centers.
Cite:
Bukatov G.D.
, Zakharov V.A.
, Barabanov A.A.
Mechanism of Olefin Polymerization on Supported Ziegler–Natta Catalysts Based on Data on the Number of Active Centers and Propagation Rate Constants
Kinetics and Catalysis. 2005. V.46. N2. P.166-176. DOI: 10.1007/s10975-005-0065-0 WOS Scopus РИНЦ ANCAN OpenAlex
Mechanism of Olefin Polymerization on Supported Ziegler–Natta Catalysts Based on Data on the Number of Active Centers and Propagation Rate Constants
Kinetics and Catalysis. 2005. V.46. N2. P.166-176. DOI: 10.1007/s10975-005-0065-0 WOS Scopus РИНЦ ANCAN OpenAlex
Original:
Букатов Г.Д.
, Захаров В.А.
, Барабанов А.А.
Исследование механизма полимеризации олефинов на нанесенных катализаторах Циглера-Натта по данным о числе активных центров и константах скорости роста
Кинетика и катализ. 2005. Т.46. №2. С.180-190. RSCI РИНЦ
Исследование механизма полимеризации олефинов на нанесенных катализаторах Циглера-Натта по данным о числе активных центров и константах скорости роста
Кинетика и катализ. 2005. Т.46. №2. С.180-190. RSCI РИНЦ
Dates:
| Submitted: | Apr 1, 2004 |
| Published print: | Mar 1, 2005 |
Identifiers:
| Web of science: | WOS:000228933000001 |
| Scopus: | 2-s2.0-18244392193 |
| Elibrary: | 13476402 |
| Chemical Abstracts: | 2005:380945 |
| Chemical Abstracts (print): | 144:70132 |
| OpenAlex: | W2072664377 |