Improved thermal stability of polyethylene with rare earth trifluoromethanesulfonate
Article
Article Title | Improved thermal stability of polyethylene with rare earth |
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ERA Journal ID | 210299 |
Article Category | Article |
Authors | Ran, Shiya (Author), Guo, Zhenghong (Author), Fang, Zhengping (Author), Li, Juan (Author) and Wang, Hao (Author) |
Journal Title | Composites Communications |
Journal Citation | 8, pp. 19-23 |
Number of Pages | 5 |
Year | 2018 |
Publisher | Elsevier |
Place of Publication | Netherlands |
ISSN | 2452-2139 |
Digital Object Identifier (DOI) | https://doi.org/10.1016/j.coco.2018.03.001 |
Web Address (URL) | https://www.sciencedirect.com/science/article/pii/S245221391730116X |
Abstract | The thermal degradation of polyethylene (PE) is a free radical chain reaction, in other words, free radicals are the primary cause of combustion and degradation. Discovering proper compounds with radical trapping ability is critical for developing flame retardant PE composites. Herein, we introduced rare earth trifluoromethanesulfonate (RE(OTf)3), with radical trapping ability, into PE. The effects of ytterbium (Yb(OTf)3) and lanthanum (La(OTf)3) on the thermal stability and flammability properties of polyethylene (PE) were investigated systemically. Electron spin resonance (ESR) spectroscopy proved the free radical-trapping ability of La(OTf)3 and Yb(OTf)3. The results of thermogravimetric analysis (TG) and differential scanning calorimetry (DSC) showed that Yb(OTf)3 could improve the thermal stability of PE more significantly compared with La(OTf)3. The flame retardancy of PE/intumescent flame retardant (IFR) composite was improved when 0.4 wt% IFR was substituted by RE(OTf)3. It changed the PE/IFR26 from UL-94 non-rated to V-0. Vertical flame test, limited oxygen index (LOI) and microscale combustion calorimeter (MCC) indicated that the effect of Yb(OTf)3 on the flame retardancy of PE was better than La(OTf)3. The improvement on the thermal stability and flame retardancy of PE is due to the combined action of anion and cation of RE(OTf)3. However, the different effects are attributed to the different reactivity of rare earth elements. |
Keywords | Flammability properties; Radical trapping; Rare earth; Thermal stability |
ANZSRC Field of Research 2020 | 401602. Composite and hybrid materials |
Byline Affiliations | NingboTech University, China |
Chinese Academy of Sciences, China | |
Centre for Future Materials | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q6zw7/improved-thermal-stability-of-polyethylene-with-rare-earth-trifluoromethanesulfonate
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