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Synthesis of a novel char‐forming agent (PEIC): Improvement in flame retardancy, thermal stability, and smoke suppression for intumescent flame‐retardant polypropylene composites
Author(s) -
Dong Xiang,
Yang Jinian,
Hua Xinzhu,
Nie Shibin,
Kong Fanbei
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.48296
Subject(s) - intumescent , ammonium polyphosphate , fire retardant , limiting oxygen index , char , materials science , polypropylene , cone calorimeter , pentaerythritol , composite material , thermal stability , composite number , chemical engineering , combustion , chemistry , organic chemistry , engineering
A novel char‐forming agent named PEIC was designed and synthesized combining pentaerythritol octahydrogen tetraphosphate (PEPA) and tris(2‐hydroxyethyl) isocyanurate. PEIC was combined with the silica‐gel‐microencapsulated ammonium polyphosphate (OS‐MCAPP), preparing intumescent flame‐retardant polypropylene (PP) composites. The results of the limiting oxygen index (LOI) show that the composite containing 30 wt % IFR with OS‐MCAPP:PEIC = 2:1 presents the optimal LOI of 32.7%. Meanwhile, the cone calorimeter tests show that its peak heat release rate is 432 kW m −2 , which decreases by 62.1% compared with that of pure PP, showing a high‐efficient flame retardancy. The exhibited UL‐94 V‐0 rating for all the composites indicates that the IFR composed of PEIC and OS‐MCAPP has high‐efficient flame retardancy in PP. The analysis of residue char reveals that PEIC could improve the quality of char in compactness, intumescentia, and the degree of graphitization. Further, the effect of IFR on the mechanical properties of PP composites was also evaluated and discussed. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48296.