期刊
POLYMER DEGRADATION AND STABILITY
卷 96, 期 4, 页码 455-461出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2011.01.019
关键词
Profluorescent nitroxide; Polypropylene; Extrusion; Degradation; Chain scission
资金
- Australian Research Council [CE0561607]
- Australian Government's Defence Future Capability Technology Centre (DFCTC) initiative
- Australian Research Council [CE0561607] Funding Source: Australian Research Council
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.
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