Improved thermal stability of polyethylene with rare earth trifluoromethanesulfonate

Ran, Shiya and Guo, Zhenghong and Fang, Zhengping and Li, Juan and Wang, Hao (2018) Improved thermal stability of polyethylene with rare earth trifluoromethanesulfonate. Composites Communications, 8. pp. 19-23. ISSN 2452-2139


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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 03 Mar 2022 05:03
Last Modified: 28 Apr 2022 03:55
Uncontrolled Keywords: Flammability properties; Radical trapping; Rare earth; Thermal stability
Fields of Research (2008): 09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Fields of Research (2020): 40 ENGINEERING > 4016 Materials engineering > 401602 Composite and hybrid materials
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970109 Expanding Knowledge in Engineering
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280110 Expanding knowledge in engineering
Identification Number or DOI: https://doi.org/10.1016/j.coco.2018.03.001
URI: http://eprints.usq.edu.au/id/eprint/46357

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