Study of the Compositional Heterogeneity of Ethylene/1–Hexene Copolymers Produced over Supported Catalysts of Different Composition Full article
| Journal |
Journal of Applied Polymer Science
ISSN: 0021-8995 , E-ISSN: 1097-4628 |
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| Output data | Year: 2012, Volume: 126, Number: 6, Pages: 2017-2023 Pages count : 7 DOI: 10.1002/app.36643 | ||
| Tags | branched, copolymers, fractionation of polymers, molecular weight distribution/molar, Ziegler-Natta polymerization | ||
| Authors |
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| Affiliations |
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Funding (1)
| 1 | Russian Foundation for Basic Research | 10-03-00136 |
Abstract:
Separation into narrow MWD fractions (liquid–liquid fractionation) and preparative TREF (temperature rising elution fractionation) with subsequent analysis of fractions by GPC, FTIR, and 13C NMR spectroscopy were used to study the comonomer distribution of ethylene/1–hexene copolymers produced over highly active supported titanium- and vanadium-magnesium catalysts (TMC and VMC) and a supported zirconocene catalyst. These catalysts produce PE with different MWD: Mw/Mn values vary from 2.9 for zirconocene catalyst, 4.0 for TMC, and 15 for VMC. 1-Hexene increases polydispersity to 25 for copolymer produced over VMC and hardly affects MWD of the copolymer produced over TMC and zirconocene catalysts. The most broad short chain branching distribution (SCBD) was found for ethylene/1–hexene copolymers produced over TMC. VMC and supported zirconocene catalyst produce copolymers with uniform profile of SCB content vs. molecular weight in spite of great differences in Mw/Mn values (22 and 2.5 respectively). TREF data showed that majority of copolymer produced over supported zirconocene catalyst was eluted at 70–90°C (about 85 wt %). In the case of VMC copolymer's fractions were eluted in the broad temperature interval (40–100°C). Accordingly, TREF data indicate a more homogeneous SCBD in copolymer, produced over supported zirconocene catalyst.
Cite:
Matsko M.A.
, Echevskaya L.G.
, Vanina M.P.
, Nikolaeva M.I.
, Mikenas T.B.
, Zakharov V.A.
Study of the Compositional Heterogeneity of Ethylene/1–Hexene Copolymers Produced over Supported Catalysts of Different Composition
Journal of Applied Polymer Science. 2012. V.126. N6. P.2017-2023. DOI: 10.1002/app.36643 WOS Scopus РИНЦ ANCAN OpenAlex
Study of the Compositional Heterogeneity of Ethylene/1–Hexene Copolymers Produced over Supported Catalysts of Different Composition
Journal of Applied Polymer Science. 2012. V.126. N6. P.2017-2023. DOI: 10.1002/app.36643 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Mar 28, 2011 |
| Accepted: | Dec 7, 2011 |
| Published online: | Jun 26, 2012 |
| Published print: | Dec 15, 2012 |
Identifiers:
| Web of science: | WOS:000308578500025 |
| Scopus: | 2-s2.0-84866264497 |
| Elibrary: | 22126856 |
| Chemical Abstracts: | 2012:914641 |
| Chemical Abstracts (print): | 157:577695 |
| OpenAlex: | W1996505905 |