By a News Reporter-Staff News Editor at Science Letter -- Investigators publish new report on Science. According to news reporting originating from Wollongong, Australia, by NewsRx correspondents, research stated, "Changes in the molecular structure of polymer antioxidants such as hindered amine light stabilisers (HALS) is central to their efficacy in retarding polymer degradation and therefore requires careful monitoring during their in-service lifetime. The HALS, bis-(1-octyloxy-2,2,6,6-tetramethyl-4-piperidinyl) sebacate (TIN123) and bis-(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate (TIN292), were formulated in different polymer systems and then exposed to various curing and ageing treatments to simulate in-service use."
Our news editors obtained a quote from the research from the University of Wollongong, "Samples of these coatings were then analysed directly using liquid extraction surface analysis (LESA) coupled with a triple quadrupole mass spectrometer. Analysis of TIN123 formulated in a cross-linked polyester revealed that the polymer matrix protected TIN123 from undergoing extensive thermal degradation that would normally occur at 292°C, specifically, changes at the 1-and 4-positions of the piperidine groups. The effect of thermal versus photo-oxidative degradation was also compared for TIN292 formulated in polyacrylate films by monitoring the in situ conversion of N-CH3 substituted piperidines to N-H. The analysis confirmed that UV light was required for the conversion of N-CH3 moieties to N-H -a major pathway in the antioxidant protection of polymers -whereas this conversion was not observed with thermal degradation."
According to the news editors, the research concluded: "The use of tandem mass spectrometric techniques, including precursor-ion scanning, is shown to be highly sensitive and specific for detecting molecular-level changes in HALS compounds and, when coupled with LESA, able to monitor these changes in situ with speed and reproducibility."
For more information on this research see: Characterising in situ activation and degradation of hindered amine light stabilisers using liquid extraction surface analysis-mass spectrometry. Analytica Chimica Acta, 2014;808():190-8. (Elsevier - www.elsevier.com; Analytica Chimica Acta - www.elsevier.com/wps/product/cws_home/502681)
The news editors report that additional information may be obtained by contacting M.R. Paine, ARC Centre of Excellence for Free Radical Chemistry and Biotechnology, School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia. Additional authors for this research include P.J. Barker and S.J Blanksby (see also Science).
Keywords for this news article include: Science, Wollongong, Australia and New Zealand.
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