成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

ChemicalBook >> journal list >> Polymer Degradation and Stability >>article
Polymer Degradation and Stability

Polymer Degradation and Stability

IF: 6.29
Download PDF

Monitoring the degradation of stabilization systems in polypropylene during accelerated aging tests by liquid chromatography combined with atmospheric pressure chemical ionization mass spectrometry

Published:1 September 2013 DOI: 10.1016/j.polymdegradstab.2013.06.015
Susanne Bei?mann , Martin Stiftinger , Klemens Grabmayer , Gernot Wallner , David Nitsche , Wolfgang Buchberger

Abstract

Degradation pathways of three commonly used antioxidants were successfully studied by using accelerated aging tests for polymers. Additionally, thermal stability and resistance to discoloration of seven stabilizers were investigated by aging pure stabilizers dissolved in the polymer-mimicking solvent squalane. Methods based on high-performance liquid chromatography hyphenated with highly sensitive tandem mass spectrometric detection (HPLC-MS) were developed for structural elucidation of degradation products. Subsequent quantification was done using UV-detection. While Irganox 1330, Irganox 3114 and Cyanox 1790 showed a similar degradation mechanism with highly colored decomposition products, no corresponding oxidized species could be found for other stabilizers and less discoloration was observed. For Irganox 1010, hydrolysis was the preferred degradation mechanism, leading to products with an increased solubility in water. Therefore this stabilizer is less suitable for materials intended for water applications. In the aged materials previously unknown degradation mechanisms were observed for Irganox 1010 and Irgafos 168 which also contribute to the inhibition of autoxidation of the polymer.

Substances (6)

Related products
Procduct Name CAS Molecular Formula Supplier Price
Antioxidant 1010 6683-19-8 C73H108O12 536 suppliers $8.00-$727.65
Antioxidant 168 31570-04-4 C42H63O3P 456 suppliers $6.00-$750.00
Antioxidant 1330 1709-70-2 C54H78O3 298 suppliers $7.00-$498.22
Antioxidant3114 27676-62-6 C48H69N3O6 265 suppliers $9.00-$1146.05
Polypropylene 9003-07-0 C22H42O3 254 suppliers $20.00-$4050.00
Antioxidant 1790 40601-76-1 C42H57N3O6 220 suppliers $11.00-$998.00