Depolymerisation of polytetrafluoroethylene - Revision history

Paulsonnendecker at 11:32, 7 December 2011

2011-12-07T11:32:45Z

137.215.122.74: /* Gerard J. Puts - Pyrolytic Depolymerisation of PTFE */

2011-12-07T09:48:18Z

‎Gerard J. Puts - Pyrolytic Depolymerisation of PTFE

Paulsonnendecker: /* Project Contributors */

2011-12-07T07:45:40Z

‎Project Contributors

Paulsonnendecker: /* Project Contributors */

2011-12-07T07:43:51Z

‎Project Contributors

Paulsonnendecker: /* Documents */

2011-12-07T07:40:33Z

‎Documents

Paulsonnendecker: /* Project Contributors */

2011-12-07T07:09:20Z

‎Project Contributors

Paulsonnendecker at 06:43, 7 December 2011

2011-12-07T06:43:11Z

Paulsonnendecker at 06:39, 7 December 2011

2011-12-07T06:39:03Z

137.215.122.74: /* Introduction */

2011-12-07T06:29:54Z

‎Introduction

Paulsonnendecker: Created page with '==Introduction== ==Project Contributors== * [http://web.up.ac.za/default.asp?ipkCategoryID=4840&sub=1&parentid=2063&subid=2102&ipklookid=7 Prof Philip L. Crouse] * Gerard J. Pu…'

2011-11-24T12:57:09Z

Created page with '==Introduction== ==Project Contributors== * [http://web.up.ac.za/default.asp?ipkCategoryID=4840&sub=1&parentid=2063&subid=2102&ipklookid=7 Prof Philip L. Crouse] * Gerard J. Pu…'

New page

==Introduction==

==Project Contributors==
* [http://web.up.ac.za/default.asp?ipkCategoryID=4840&sub=1&parentid=2063&subid=2102&ipklookid=7 Prof Philip L. Crouse]
* Gerard J. Puts
* Paul W. Sonnendecker

==Equipment==

==Experimental Procedures==

==Publications and Contributions to Conferences==

==Current Projects==

==Documents==

@@ Line 23: / Line 23: @@
 ==Experimental Procedures==
 ==Current Projects==
-==Documents==
+==Documents, Publications and Contributions to Conferences==
 ===Gerard J. Puts - Pyrolytic Depolymerisation of PTFE===
 Follow these links to the following reports/publications;

← Older revision		Revision as of 09:48, 7 December 2011
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	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/GJ%20Puts%20Poster.pdf Gerard J. Puts - CSC 421 Research Project Poster]		* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/GJ%20Puts%20Poster.pdf Gerard J. Puts - CSC 421 Research Project Poster]

−	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Gerard%20Puts%20-%20Navorsingsopsomming.pdf Gerard J. Puts - Suid Afrikaanse Akademie vir Wetenskap en Kuns 2011 Opsomming]	+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Gerard%20Puts%20-%20Navorsingsopsomming.pdf Gerard J. Puts - Suid Afrikaanse Akademie vir Wetenskap en Kuns 2011 Studente Simposium Opsomming]
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Politetrafluoroetileenpirolisie%20onder%20verlaagde%20druk%200.pdf Gerard J. Puts - Suid Afrikaanse Akademie vir Wetenskap en Kuns Studente Simposium 2011 Aanbieding]

@@ Line 18: / Line 18: @@
 * [http://web.up.ac.za/default.asp?ipkCategoryID=4840&sub=1&parentid=2063&subid=2102&ipklookid=7 Prof Philip L. Crouse]
 * [[Fluoro-materials Science#Students|Gerard J. Puts]]
-* [[Fluoro-materials Science#Personnel|Paul W. Sonnendecker]
+* [[Fluoro-materials Science#Personnel|Paul W. Sonnendecker]]
 ==Equipment==

← Older revision		Revision as of 07:40, 7 December 2011
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	==Documents==		==Documents==
		+	===Gerard J. Puts - Pyrolytic Depolymerisation of PTFE===
		+	Follow these links to the following reports/publications;
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Gerard_Puts_Pyrolitic_Depolymerisation_of_PTFE_1.1_GJP.pdf Gerard J. Puts - CSC 411 Research Project Report]
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/PUTS_CROUSE_REDUCED_PRESSURE_PYROLYSIS_1.0_GJP.pdf Gerard J. Puts - CSC 421 Research Project Paper]
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Gerard_Puts_Pyrolitic_Depolymerisation_of_PTFE_1.1_GJP.pdf Gerard J. Puts - CSC 421 Research Project Presentation]
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/GJ%20Puts%20Poster.pdf Gerard J. Puts - CSC 421 Research Project Poster]
		+
		+	* [ftp://ragnarok.up.ac.za/publicftp/lab/Fluoro-materials%20Science/ptfe_depolymerisation/reports_publications/Gerard%20Puts%20-%20Navorsingsopsomming.pdf Gerard J. Puts - Suid Afrikaanse Akademie vir Wetenskap en Kuns 2011 Opsomming]

← Older revision		Revision as of 06:43, 7 December 2011
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−	[[File:~~depol_apparatus~~.~~jpg~~\|500px\|thumb\|right\|Setup used for the pyrolytic depolymerisation of polytetrafluoroethylene.]]	+	[[File:Depol_apparatus.JPG\|500px\|thumb\|right\|Setup used for the pyrolytic depolymerisation of polytetrafluoroethylene.]]

	==Introduction==		==Introduction==

@@ Line 17: / Line 17: @@
 ==Project Contributors==
 * [http://web.up.ac.za/default.asp?ipkCategoryID=4840&sub=1&parentid=2063&subid=2102&ipklookid=7 Prof Philip L. Crouse]
-* Gerard J. Puts
+* [[Fluoro-materials Science#Students|Gerard J. Puts]]
 * Paul W. Sonnendecker

← Older revision		Revision as of 06:39, 7 December 2011
Line 1:		Line 1:
		+	[[File:depol_apparatus.jpg\|500px\|thumb\|right\|Setup used for the pyrolytic depolymerisation of polytetrafluoroethylene.]]
		+
	==Introduction==		==Introduction==

← Older revision		Revision as of 06:29, 7 December 2011
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	==Introduction==		==Introduction==

		+	[http://en.wikipedia.org/wiki/Polytetrafluoroethylene Polytetrafluoroethylene] (also known as Teflon®) is the most common fluoropolymer currently in use, its applications ranging from non-stick coatings in cookware to corrosion resistant pipe linings in the nuclear industry. Any commercial entity wanting to enter the [http://en.wikipedia.org/wiki/Fluoropolymers fluoropolymers] market usually starts with the production of polytetrafluoroethylene.
		+
		+	The data regarding technical parameters associated with the production of polytetrafluoroethylene is not available in the open literature. The Fluoro-Materials Group is conducting research regarding these parameters, specifically centring on the kinetics of polymerisation for polytetrafluoroethylene.
		+
		+	[http://en.wikipedia.org/wiki/Tetrafluoroethylene Tetrafluoroethylene] (the monomer of polytetrafluoroethylene) is a colourless, odourless gas at standard conditions. Under pressure tetrafluoroethylene readily undergoes autopolymerisation and in the presence of oxygen it explosively combusts to form [http://en.wikipedia.org/wiki/Peroxides peroxides] and perfluorides. This property makes it undesirable to store tetrafluoroethylene in large quantities within a confined space and, in such cases, small scale synthesis of the required compound is preferred.
		+
		+	The industrial method for the preparation of tetrafluoroethylene in an energy intensive process that requires the use of dangerous and corrosive materials such as [http://en.wikipedia.org/wiki/Chlorine_dioxide chlorine dioxide] and [http://en.wikipedia.org/wiki/Hydrogen_fluoride hydrogen fluoride], which makes this method unsuitable for routine laboratory synthesis.
		+
		+	A more convenient method for synthesising tetrafluoroethylene is found in the [http://en.wikipedia.org/wiki/Pyrolisis pyrolitic] depolymerisation of polytetrafluoroethylene. This method entails the heating of a quantity of polytetrafluoroethylene to high temperatures under high vacuum conditions. The polymer chains subsequently break down to form radical species which revert to more stable states, forming tetrafluoroethylene.
		+
		+	The reaction conditions must be well controlled as that, under pressures higher than 500 Pa, toxic by-products can form. The most dangerous of these is [http://en.wikipedia.org/wiki/Perfluoroisobutene perfluoroisobutene], which is deadly at parts per billion concentration levels.

	==Project Contributors==		==Project Contributors==