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Chromium(III) based Ziegler-Natta catalysts for olefin polymerization

Four chromium based oxo-trinuclear carboxylate complexes were prepared by reacting chromium(III) nitrate nonahydrate with acetic acid and substituted carboxylic acids. They were characterized using infrared spectroscopy (FT-IR). Chromium content of the complexes was determined by titrimetry method....

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Main Authors: Wong .J.X,, Gan .S.N,, Aishah .M.J,
Format: Article
Language:English
Published: Universiti Kebangsaan Malaysia 2011
Online Access:http://journalarticle.ukm.my/2568/1/16_J.X._Wong.pdf
http://journalarticle.ukm.my/2568/
http://www.ukm.my/jsm/
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spelling my-ukm.journal.25682016-12-14T06:32:00Z http://journalarticle.ukm.my/2568/ Chromium(III) based Ziegler-Natta catalysts for olefin polymerization Wong .J.X, Gan .S.N, Aishah .M.J, Four chromium based oxo-trinuclear carboxylate complexes were prepared by reacting chromium(III) nitrate nonahydrate with acetic acid and substituted carboxylic acids. They were characterized using infrared spectroscopy (FT-IR). Chromium content of the complexes was determined by titrimetry method. The chromium(III) monochloroacetate complex, [Cr3O(ClCH2COO)6.3H2O]NO3.3H2O in combination with diethylaluminium chloride formed heterogeneous catalyst system for ethylene polymerization. Both Al/Cr ratio and temperature influenced the catalytic activity. The maximum activity was 1768 gPE/gCr/hr/atm, achieved by polymerizing at 29°C and monomer pressure around 1 atm, with Al/Cr ratio 30.8. Effect of chloro-substituent groups on carboxylic ligand was studied by comparing the catalytic acitivities of chromium(III) monochloroacetate, chromium(III) dichloroacetate, chromium(III) trichloroacetate and chromium(III) acetate.The polymerization reaction was found to be first order with respect to the monomer during the initial stage. The activity decreases very rapidly presumably due to fast decay of the active sites. The polyethylene was characterized using FT-IR and DSC, and the results showed that it was of high density and crystallinity. Universiti Kebangsaan Malaysia 2011-07 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/2568/1/16_J.X._Wong.pdf Wong .J.X, and Gan .S.N, and Aishah .M.J, (2011) Chromium(III) based Ziegler-Natta catalysts for olefin polymerization. Sains Malaysiana, 40 (7). pp. 771-779. ISSN 0126-6039 http://www.ukm.my/jsm/
institution Universiti Kebangsaan Malaysia
building Perpustakaan Tun Sri Lanang Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Kebangsaan Malaysia
content_source UKM Journal Article Repository
url_provider http://journalarticle.ukm.my/
language English
description Four chromium based oxo-trinuclear carboxylate complexes were prepared by reacting chromium(III) nitrate nonahydrate with acetic acid and substituted carboxylic acids. They were characterized using infrared spectroscopy (FT-IR). Chromium content of the complexes was determined by titrimetry method. The chromium(III) monochloroacetate complex, [Cr3O(ClCH2COO)6.3H2O]NO3.3H2O in combination with diethylaluminium chloride formed heterogeneous catalyst system for ethylene polymerization. Both Al/Cr ratio and temperature influenced the catalytic activity. The maximum activity was 1768 gPE/gCr/hr/atm, achieved by polymerizing at 29°C and monomer pressure around 1 atm, with Al/Cr ratio 30.8. Effect of chloro-substituent groups on carboxylic ligand was studied by comparing the catalytic acitivities of chromium(III) monochloroacetate, chromium(III) dichloroacetate, chromium(III) trichloroacetate and chromium(III) acetate.The polymerization reaction was found to be first order with respect to the monomer during the initial stage. The activity decreases very rapidly presumably due to fast decay of the active sites. The polyethylene was characterized using FT-IR and DSC, and the results showed that it was of high density and crystallinity.
format Article
author Wong .J.X,
Gan .S.N,
Aishah .M.J,
spellingShingle Wong .J.X,
Gan .S.N,
Aishah .M.J,
Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
author_facet Wong .J.X,
Gan .S.N,
Aishah .M.J,
author_sort Wong .J.X,
title Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
title_short Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
title_full Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
title_fullStr Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
title_full_unstemmed Chromium(III) based Ziegler-Natta catalysts for olefin polymerization
title_sort chromium(iii) based ziegler-natta catalysts for olefin polymerization
publisher Universiti Kebangsaan Malaysia
publishDate 2011
url http://journalarticle.ukm.my/2568/1/16_J.X._Wong.pdf
http://journalarticle.ukm.my/2568/
http://www.ukm.my/jsm/
_version_ 1643735424569442304
score 13.211869

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