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Flame‐retarded polyethylene terephthalate with carbon microspheres/magnesium hydroxide compound flame retardant
Author(s) -
Yang Yaru,
Niu Mei,
Dai Jinming,
Bai Jie,
Xue Baoxia,
Song Yinghao,
Peng Yun
Publication year - 2018
Publication title -
fire and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.482
H-Index - 58
eISSN - 1099-1018
pISSN - 0308-0501
DOI - 10.1002/fam.2634
Subject(s) - fire retardant , char , polyethylene terephthalate , materials science , magnesium , combustion , composite material , pyrolysis , cone calorimeter , polyethylene , thermal stability , chemical engineering , waste management , organic chemistry , chemistry , metallurgy , engineering
Summary A novel compound flame retardant (carbon microspheres/magnesium hydroxide, abbreviated as CMSs/MH) was used to improve the fire performance of polyethylene terephthalate (PET). LOI, UL94, and Cone test results showed that CMSs/MH/PET composites obtained the best fire performance at the mass ratio of CMSs to MH, which was 5:5, where the CMSs/MH content was 1.0 wt. % of PET. The Py‐CS‐MS, TGA‐DSC results, and morphology of char residue revealed the flame‐retardant mechanism. CMSs/MH increased the thermal stability of PET by increasing the activation energy at the initial combustion stage. At the second stage of combustion, CMSs/MH increased the chance of recombination of free radicals and slowed the combustion. Additionally, CMSs/MH promoted the cross‐linking of pyrolysis products and further improved the continuity of the char layer. Thus, a dense and continuous char layer of CMSs/MH/PET composites was produced; this char layer reduced the heat release rate and increased the amount of char residue.