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Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene
Dissertation (MSc)--University of Pretoria, 2018.
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| Format: | Thesis |
| Language: | English |
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University of Pretoria
2018
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| _version_ | 1867613472387235840 |
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| access_status_str | Open Access |
| author2 | Focke, Walter Wilhelm |
| author_browse | Focke, Walter Wilhelm |
| author_facet | Focke, Walter Wilhelm |
| collection | Thesis |
| dc_rights_str_mv | © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. |
| description | Dissertation (MSc)--University of Pretoria, 2018. |
| format | Thesis |
| id | oai:repository.up.ac.za:2263/66222 |
| institution | University of Pretoria (South Africa) |
| language | English |
| last_indexed | 2026-06-10T12:36:41.285Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UPSpace — University of Pretoria Institutional Repository |
| publishDate | 2018 |
| publishDateRange | 2018 |
| publishDateSort | 2018 |
| publisher | University of Pretoria |
| publisherStr | University of Pretoria |
| record_format | dspace |
| source_str | UPSpace — University of Pretoria Institutional Repository |
| spelling | oai:repository.up.ac.za:2263/66222 Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene Focke, Walter Wilhelm cebokhanya@gmail.com Mwakikunga, Bonex W. Mbonane, Cebolenkosi UCTD Flame retardant (FR) Polyethylene Graphite Laser pyrolysis Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 Dissertation (MSc)--University of Pretoria, 2018. The fire behaviour of linear low-density polyethylene composites containing 10 wt.% of different carbon-based fillers was studied. Cone calorimeter tests conducted at a heat flux of 35 kW_m_2 showed that the expandable graphite sample reduced the peak heat release rate by about 50 % while the flake graphite increased the ignition time by about 80 %. Pyrolysis combustion flow calorimetry results were practically identical for all composites. This reveals shortcomings of this bench-scale flammability test method when the flame retardancy mechanisms relies on either the development of physical barrier layer at the surface of the burning sample or on reflecting the incident heat flux. Similarly, it was found that laser pyrolysis-thermogravimetric analysis generated outcomes that did not correlate with the cone calorimeter results at all. In particular, the composite based on expandable graphite performed poorly. The likely explanation is that the aspect ratios of the small samples were such that the barrier effects on which this system relies, was negated by edge effects. mi2026 Chemical Engineering MSc Unrestricted SDG-09: Industry, innovation and infrastructure SDG-11: Sustainable cities and communities SDG-12: Responsible consumption and production 2018-08-17T09:42:43Z 2018-08-17T09:42:43Z 4/19/18 2018 Dissertation Mbonane, C 2018, Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene, MSc Dissertation, University of Pretoria, Pretoria, viewed yymmdd <http://hdl.handle.net/2263/66222> A2018 http://hdl.handle.net/2263/66222 en © 2018 University of Pretoria. All rights reserved. The copyright in this work vests in the University of Pretoria. No part of this work may be reproduced or transmitted in any form or by any means, without the prior written permission of the University of Pretoria. application/pdf University of Pretoria |
| spellingShingle | UCTD Flame retardant (FR) Polyethylene Graphite Laser pyrolysis Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title | Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title_full | Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title_fullStr | Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title_full_unstemmed | Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title_short | Laser-pyrolysis and flammability testing of graphite flame-retarded polyethylene |
| title_sort | laser pyrolysis and flammability testing of graphite flame retarded polyethylene |
| topic | UCTD Flame retardant (FR) Polyethylene Graphite Laser pyrolysis Engineering, built environment and information technology theses SDG-09 Engineering, built environment and information technology theses SDG-11 Engineering, built environment and information technology theses SDG-12 |
| url | http://hdl.handle.net/2263/66222 |