Kinetic Study of Ethylene Polymerization with Chromium Oxide Catalysts by a Radiotracer Technique Full article
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Symposium on Macromolecular Chemistry 25-30 Aug 1969 , Budapest |
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| Journal |
Journal of Polymer Science, Part A: Polymer Chemistry
ISSN: 0887-624X , E-ISSN: 1099-0518 |
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| Output data | Year: 1971, Volume: 9, Number: 11, Pages: 3129-3146 Pages count : 18 DOI: 10.1002/pol.1971.150091104 | ||
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Abstract:
The quenching of polymerization with a chromium oxide catalyst by radioactive methanol 14CH3OH enables one to determine the concentration of propagation centers and then to calculate the rate constant of the propagation. The dependence of the concentration of propagation centers and the polymerization rate on reaction time, ethylene concentration, and temperature was investigated. The change of the concentration of propagation centers with the duration of polymerization was found to be responsible for the time dependence of the overall polymerization rate. The propagation reaction is of first order on ethylene concentration in the pressure range 2–25 kg/cm2. For catalysts of different composition, the temperature dependence of the overall polymerization rate and the propagation rate constant were determined, and the overall activation energy Eov and activation energy of the propagation state Ep were calculated. The difference between Eov and Ep is due to the change of the number of propagation centers with temperature. The variation of catalyst composition and preliminary reduction of the catalyst influence the shape of the temperature dependence of the propagation center concentration and change Eov.
Cite:
Zakharov V.A.
, Ermakov Y.I.
Kinetic Study of Ethylene Polymerization with Chromium Oxide Catalysts by a Radiotracer Technique
Journal of Polymer Science, Part A: Polymer Chemistry. 1971. V.9. N11. P.3129-3146. DOI: 10.1002/pol.1971.150091104 WOS РИНЦ ANCAN OpenAlex
Kinetic Study of Ethylene Polymerization with Chromium Oxide Catalysts by a Radiotracer Technique
Journal of Polymer Science, Part A: Polymer Chemistry. 1971. V.9. N11. P.3129-3146. DOI: 10.1002/pol.1971.150091104 WOS РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Oct 2, 1969 |
| Accepted: | Jun 18, 1971 |
| Published print: | Nov 1, 1971 |
| Published online: | Mar 10, 2003 |
Identifiers:
| Web of science: | WOS:A1971L185200004 |
| Elibrary: | 26563230 |
| Chemical Abstracts: | 1972:100138 |
| Chemical Abstracts (print): | 76:100138 |
| OpenAlex: | W2124898003 |