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The flame retardant and thermal performances of polypropylene with a novel intumescent flame retardant
Author(s) -
Qi Hongsheng,
Liu Sawen,
Chen Xiuling,
Shen Chunhui,
Gao Shanjun
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49047
Subject(s) - intumescent , fire retardant , limiting oxygen index , pentaerythritol , thermogravimetric analysis , materials science , melamine , polymer chemistry , thermal decomposition , char , polypropylene , fourier transform infrared spectroscopy , composite material , chemical engineering , combustion , chemistry , organic chemistry , engineering
A novel mono‐component intumescent flame retardant(m‐IFR), called poly‐(spirocyclic pentaerythritol bisphosphonate‐1,3,5‐triazine‐O‐bicyclic pentaerythritol phosphate) (PSTBP) was synthesized and characterized. PSTBP was used in polypropylene (PP) to obtain PP/PSTBP mixture whose flame retardancy, thermostability, and water resistance were studied by limiting oxygen index (LOI), vertical burning test (UL‐94 V) and thermogravimetric analysis (TGA). In addition, flame‐retardant mechanism of the PSTBP was investigated. The results showed that the residue of PSTBP reached 34.58% at 800°C and the volume of the PSTBP increased by dozens of times. When the content of PSTBP was 30.0 wt%, the PP/PSTBP mixture could achieve an LOI value of 32.5% and an UL‐94 V‐0 rating. Compared with PP/APP/PER system, PP/PSTBP mixture showed better water resistance. The TGA and Fourier transform infrared spectroscopy (FTIR) results showed that PSTBP could generate free radicals and capture the free radicals of the thermal decomposition of PP, and form a dense, strong, and thick intumescent char on the substrate, thus effectively retard the degradation and combustion of PP.