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Synthesis, thermal degradation, and flame retardancy of a novel charring agent aliphatic—aromatic polyamide for intumescent flame retardant polypropylene
Author(s) -
Yi Jiangsong,
Liu Yi,
Pan Dongdong,
Cai Xufu
Publication year - 2012
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.37910
Subject(s) - intumescent , charring , thermogravimetric analysis , ammonium polyphosphate , fire retardant , limiting oxygen index , materials science , char , polypropylene , thermogravimetry , composite material , thermal stability , polymer chemistry , fourier transform infrared spectroscopy , chemical engineering , nuclear chemistry , pyrolysis , chemistry , engineering
In this article, the laboratory‐made poly(p‐ethylene terephthalamide) (PETA) was used as a novel charring agent; it was characterized by Fourier transform infrared spectroscopy and 1 H NMR. PETA combined with ammonium polyphosphate (APP) to prepare the intumescent flame retardant (IFR), which was applied in polypropylene (PP). The flame retardancy of IFR on PP was investigated by the limiting oxygen index (LOI), the UL‐94 (vertical flame) test, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). The results showed that the LOI value of the IFR‐PP (30/70) system reached the highest 35%, and the system passed V‐0 rating, when the weight ratio of PETA to APP was 1 : 3. The TGA data indicated that the charring ability of PETA was relatively poor with 18.0 wt % char residue at 800°C. However, the residual weight of the IFR was promoted with 28.1 wt % at 800°C, while it was 22.8 wt % based on calculation. The SEM showed that the intumescent and dense charring layer was formed after the combustion of the IFR‐PP(30/70) system. In addition, the thermal degradation mechanism of PETA and IFR was studied by thermogravimetry‐Fourier transform infraredspectroscopy and IR, and it demonstrated that the reaction between APP and PETA was happened and the POC structure was got. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013