Abdullah, Che Ibrahim (2014) Synthesis of some chromium (III) complexes and the use of these complexes as catalyst for the polymerization of alpha-olefins / Che Ibrahim bin Abdullah. Masters thesis, University of Malaya.
![[img]](http://studentsrepo.um.edu.my/style/images/fileicons/application_pdf.png)
| PDF Download (7Kb) | Preview | |
| PDF (Full Text) Download (183Kb) | Preview | |
| PDF Download (95Kb) | Preview | |
| PDF Download (109Kb) | Preview | |
| PDF Download (53Kb) | Preview | |
| PDF Download (203Kb) | Preview | |
| PDF Download (204Kb) | Preview | |
| PDF Download (176Kb) | Preview | |
| PDF Download (110Kb) | Preview | |
| PDF Download (324Kb) | Preview | |
| PDF Download (1366Kb) | Preview | |
| PDF Download (1204Kb) | Preview | |
| PDF Download (747Kb) | Preview | |
| PDF Download (116Kb) | Preview | |
| PDF Download (1372Kb) | Preview |
Abstract
A series of chromium(III) and chromium(III)-iron(III) carboxylate complexes were prepared by heating common chromium(III) and Iron(III) salts in carboxylic acids. The structure of these complexes has been confirmed by X-ray crystallography to give a trinuclear oxo-centred carboxylate. The characterization of complexes was carried out by UV-visible spectroscopy, IR spectroscopy, Thermal analysis (TGA), CHN-elemental analysis and metal content analysis. The complexes contain a triangular arrangement of metal ions connected by a central μ3-oxo atom and bridged with six carboxylate ligands. Each carboxylate anion spans two metal centres at the periphery of the [M3(μ3-O)]6+ core, while H2O ligands occupy the remaining coordination sites on each metal centre to form a coordinated H2O. The coordination around the metal centre is approximately octahedral. These complexes with combination of diethylaluminium chloride as a cocatalyst were used in the polymerization of ethylene to form a heterogeneous catalyst system. The polymerization of ethylene was performed by varying the Al/Cr molar ratio, temperature and changing the catalyst complexes. Kinetic data show that the polymerization of ethylene is a first order reaction. The polymerization of ethylene was modified by introducing SMRCV (natural rubber) into the polymerization system. The polymer produced was characterized by using ATR-IR spectroscopy, TGA, powder XRD and differential scanning calorimetric (DSC).
| Item Type: | Thesis (Masters) |
|---|---|
| Additional Information: | Dissertation (M.Sc.) -- Department of Chemistry, Faculty of Science, University of Malaya, 2014. |
| Uncontrolled Keywords: | Synthesis; Chromium (III) complexes; Catalyst; Polymerization; Alpha-olefins |
| Subjects: | Q Science > Q Science (General) Q Science > QD Chemistry |
| Divisions: | Faculty of Science |
| Depositing User: | Mrs Nur Aqilah Paing |
| Date Deposited: | 13 Mar 2015 14:42 |
| Last Modified: | 13 Mar 2015 14:42 |
| URI: | http://studentsrepo.um.edu.my/id/eprint/4882 |
Actions (For repository staff only : Login required)
| View Item |
