Effects of lignin-based flame retardants on flame-retardancy and insulation performances of epoxy resin composites

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Li Chaohua; Wang Bikui; Zhou Longjing; Hou Xi; Su Shengpei

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Journal Paper

Paper Information

Journal: IRANIAN POLYMER JOURNAL Year:2022 | Volume:31 | Issue:8 Page(s): 949-962

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Information Journal Paper

Title

Effects of lignin-based flame retardants on flame-retardancy and insulation performances of epoxy resin composites

Author(s)

Li Chaohua | Wang Bikui | Zhou Longjing | Hou Xi | Su Shengpei

Keywords

Lignin

Flame retardants

Epoxy resin

Char layer

Dispersion uniformity

Abstract

It is of great interest and remains a challenge to simultaneously improve the compatibility and flame-retardant performance of lignin/epoxy resin (EP) composites. In this work, a polysiloxane-enwrapped phosphorus-containing lignin-based flame retardant (PHMS-lig-P) was prepared through reactions of lignin, PHMS and TCP to address this issue, with results showing significantly improved flame-retardant performance and comprehensive performance. The influence of PHMS-lig-P on the flame retardancy of EP was investigated by vertical burning test (UL-94V), limiting oxygen index (LOI), smoke density test and cone calorimeter (CC) test. The PHMS-lig-P/EP achieved a V-1 rating, and its LOI value increased to 25. 3%. The maximum smoke density (Ds, max) decreased by 83. 2%. Furthermore, pHRR, avHRR, and MLR of PHMS-lig-P/EP decreased by 37. 5%, 22. 6%, and 25. 1%, respectively. In addition, the evolved gases and char residues were studied using thermogravimetric analysis coupled with Fourier transform infrared spectrometry (TG-FTIR) and scanning electron microscopy (SEM). The results certified the flame-retardant mechanism of PHMS-lig-P was attributed to the synergistic effect of lignin, phosphonate, and polysiloxane, producing a compact and cohesive char layer that acted as a physical barrier, limiting the transfer of heat and oxygen and preventing the spread of pyrolysis volatiles and flammable gases. Moreover, the flame-retarded epoxy resin possessed good dispersion uniformity in mechanical properties and insulation performance, showing good applicability.

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APA: Copy

Li, Chaohua, Wang, Bikui, Zhou, Longjing, Hou, Xi, & Su, Shengpei. (2022). Effects of lignin-based flame retardants on flame-retardancy and insulation performances of epoxy resin composites. IRANIAN POLYMER JOURNAL (ENGLISH), 31(8), 949-962. SID. https://sid.ir/paper/1040586/en

Vancouver: Copy

Li Chaohua, Wang Bikui, Zhou Longjing, Hou Xi, Su Shengpei. Effects of lignin-based flame retardants on flame-retardancy and insulation performances of epoxy resin composites. IRANIAN POLYMER JOURNAL (ENGLISH)[Internet]. 2022;31(8):949-962. Available from: https://sid.ir/paper/1040586/en

IEEE: Copy

Chaohua Li, Bikui Wang, Longjing Zhou, Xi Hou, and Shengpei Su, “Effects of lignin-based flame retardants on flame-retardancy and insulation performances of epoxy resin composites,” IRANIAN POLYMER JOURNAL (ENGLISH), vol. 31, no. 8, pp. 949–962, 2022, [Online]. Available: https://sid.ir/paper/1040586/en

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