Investigation of polypropylene degradation during melt processing using a profluorescent nitroxide probe: A laboratory-scale study

Moghaddam, Laleh, Blinco, James P., Colwell, John M., Halley, Peter J., Bottle, Steven E., Fredericks, Peter M. and George, Graeme A. (2011) Investigation of polypropylene degradation during melt processing using a profluorescent nitroxide probe: A laboratory-scale study. Polymer Degradation and Stability, 96 4: 455-461. doi:10.1016/j.polymdegradstab.2011.01.019


Author Moghaddam, Laleh
Blinco, James P.
Colwell, John M.
Halley, Peter J.
Bottle, Steven E.
Fredericks, Peter M.
George, Graeme A.
Title Investigation of polypropylene degradation during melt processing using a profluorescent nitroxide probe: A laboratory-scale study
Journal name Polymer Degradation and Stability   Check publisher's open access policy
ISSN 0141-3910
0144-2880
1873-2321
Publication date 2011-04-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.polymdegradstab.2011.01.019
Open Access Status Not yet assessed
Volume 96
Issue 4
Start page 455
End page 461
Total pages 7
Place of publication Oxford, U.K.
Publisher Elsevier
Language eng
Subject 3104 Condensed Matter Physics
2211 Mechanics of Materials
2507 Polymers and Plastics
2505 Materials Chemistry
Abstract Degradation of polypropylene (PP) during melt processing was studied using a novel profluorescence technique. The profluorescent nitroxide probe, 1,1,3,3-tetramethyldibenzo[e,g]isoindolin-2-yloxyl (TMDBIO) was added to PP during melt processing to act as a sensor for carbon-centred radicals. Trapping of carbon-centred radicals, formed during degradation of PP, led to an increase in fluorescence emission from TMDBIO adducts. Through analysis of viscosity changes during processing cumulative chain scission degradation was estimated. At processing temperatures of 210 degrees C or below, fluorescence emission from TMDBIO adducts could be correlated with cumulative chain scissions when the number of chain scissions was small. At higher temperatures, a correlation was not observed most probably due to radical-trap instability rather than decomposition of the TMDBIO. Thus. TMDBIO may be used as a profluorescent sensor for degradation of PP during melt processing when the processing temperature is 210 degrees C or below. (C) 2011 Elsevier Ltd. All rights reserved.
Formatted abstract
Degradation of polypropylene (PP) during melt processing was studied using a novel profluorescence technique. The profluorescent nitroxide probe, 1,1,3,3-tetramethyldibenzo[e,g]isoindolin-2-yloxyl (TMDBIO) was added to PP during melt processing to act as a sensor for carbon-centred radicals. Trapping of carbon-centred radicals, formed during degradation of PP, led to an increase in fluorescence emission from TMDBIO adducts. Through analysis of viscosity changes during processing cumulative chain scission degradation was estimated. At processing temperatures of 210 °C or below, fluorescence emission from TMDBIO adducts could be correlated with cumulative chain scissions when the number of chain scissions was small. At higher temperatures, a correlation was not observed most probably due to radical-trap instability rather than decomposition of the TMDBIO. Thus, TMDBIO may be used as a profluorescent sensor for degradation of PP during melt processing when the processing temperature is 210 °C or below.
Keyword Profluorescent nitroxide
Polypropylene
Extrusion
Degradation
Chain scission
Thermooxidative degradation
Thermal-degradation
Mechanical fracture
ESR evidence
Efficient
Polymers
Sensors
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID CE0561607
Institutional Status UQ

 
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Created: Thu, 22 Sep 2011, 22:11:18 EST by Professor Peter Halley on behalf of School of Mechanical and Mining Engineering