Effects of multi-walled carbon nanotubes on flame retardation and thermal stabilization performance of phosphorus-containing flame retardants in polypropylene
Tóm tắt
Effects of multi-walled carbon nanotubes (MWNTs) on flame retardation as well as thermal stabilization efficiency of two phosphorus-containing flame retardant systems i.e., ammonium polyphosphate/pentaerythritol (APP/PER) and red phosphorus (RP) in polypropylene (PP) have been investigated. Limiting oxygen index, thermo-gravimetric analysis, melt flow index, and tensile tests have been performed in this study. Moreover, the structure of the nanocomposites was characterized by scanning electron microscopy (SEM). SEM images revealed good dispersion of fillers in the polymer matrix. Furthermore, it was shown that the addition of MWNTs alone at a minimum loading level of 4 wt% improves thermal stability of PP considerably without any undesirable effect on its flow-ability and mechanical properties. Moreover, addition of MWNTs alone resulted in a slight improvement of flammability of the polymer. However, comparison between thermal stability and flame retardancy of PP samples containing a combination of MWNTs and APP/PER or RP and those of the samples containing APP/PER or RP alone proved that MWNTs interfere with thermal stabilization and flame retardation efficiency of both APP/PER and RP in the polymer.
Tài liệu tham khảo
Chiang WY, Hu HC: Phosphate-containing flame-retardant polymers with good compatibility to polypropylene. II. Effect of the flame-retardant polymers on polypropylene. J. Appl. Polym. Sci. 2001, 82: 2399. 10.1002/app.2090
Lu SY, Hamerton I: Recent developments in the chemistry of halogen-free flame retardant polymers. Prog. Polym. Sci. 2002, 27: 1661. 10.1016/S0079-6700(02)00018-7
Li Q, Zhong H, Wei P, Jiang P: Thermal degradation behaviors of polypropylene with novel silicon-containing intumescent flame retardant. J. Appl. Polym. Sci. 2005, 98: 2487. 10.1002/app.21944
Paul DR, Robeson LM: Polymer nanotechnology: nanocomposites. Polymer 2008, 49: 3187. 10.1016/j.polymer.2008.04.017
Laoutid F, Bonnaud L, Alexandre M, Lopez-Cuesta JM, Dubois P: New prospects in flame retardant polymer materials: from fundamentals to nanocomposites. Mater. Sci. Eng. R. Rep. 2009, 63: 100. 10.1016/j.mser.2008.09.002
Cipiriano B, Kashiwagi T, Raghavan SR, Yang Y, Grulke EA, Yamamoto K, Shields JR, Douglas JF: Effects of aspect ratio of MWNT on the flammability properties of polymer nanocomposites. Polymer 2007, 48: 6086. 10.1016/j.polymer.2007.07.070
Chen Y, Wang Q: Thermal oxidative degradation kinetics of flame-retarded polypropylene with intumescent flame-retardant master batches in situ prepared in twin-screw extruder. Polym. Degrad. Stab. 2007, 92: 280. 10.1016/j.polymdegradstab.2006.11.004
Li Q, Jiang P, Su Z, Wei P, Wang G: Tang, X: synergistic effect of phosphorus, nitrogen, and silicon on flame-retardant properties and char yield in polypropylene. J. Appl. Polym. Sci. 2005, 96: 854. 10.1002/app.21522
Zhang Q, Xing H, Sun C, Xiang H, Jiang D, Qin L: The mechanical properties and thermal performances of polypropylene with a novel intumescent flame retardant. J. Appl. Polym. Sci. 2010, 115: 2170. 10.1002/app.31348
Kashiwagi T, Grulke E, Hilding J, Harris R, Awad W, Douglas J: Thermal degradation and flammability properties of poly(propylene)/carbon nanotube composites. Macromol. Rapid Commun. 2002, 23: 761. 10.1002/1521-3927(20020901)23:13<761::AID-MARC761>3.0.CO;2-K
Rizvi R, Khan O, Naguib HE: Development and characterization of solid and porous polylactide-multiwall carbon nanotube composites. Polym. Eng. Sci. 2011, 51: 43. 10.1002/pen.21792
Stark NM, White RH, Mueller SA, Osswald TA: Evaluation of various fire retardants for use in wood flourepolyethylene composites. Polym. Degrad. Stab. 2010, 95: 1903. 10.1016/j.polymdegradstab.2010.04.014
Zhang S, Horrocks R: A review of flame retardant polypropylene fibres. Prog. Polym. Sci. 2003, 28: 1517. 10.1016/j.progpolymsci.2003.09.001