Abstract
A novel boron-coated expandable graphite(BEG) material was prepared by first wrapping polyvinyl alcohol( PVA) onto expandable graphite(EG) and then condensing with boric acid. The obtained BEG was characterized by scanning electron microscopy(SEM), Fourier transform infrared(FTIR) spectroscopy, X-ray photoelectron spectroscopy(XPS), and thermogravimetric analysis(TGA). The fire performance and mechanical properties of the rigid polyurethane foam(RPUF) filled with BEG were investigated by limiting oxygen index(LOI), horizontal and vertical burning, cone calorimetry(CONE), and electronic tensile tests. BEG shows an improved compactness of the char layers upon thermal expansion, which is effective for the flame retardancy of RPUF. With a loading of 10%, RPUF/BEG exhibited a higher LOI, >10% reduction in heat release rate and carbon monoxide release, as well as a decrease in smoke release during the beginning of combustion compared to RPUF/EG. Moreover, the compressive strength and modulus of RPUF/BEG were increased. The improved flame retardancy of BEG on RPUF can be attributed to the suppression of the “popcorn effect” of EG by PVA-boric acid, and the improved mechanical property can be attributed to the presence of PVA.
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Liu Y. J., Polyurethane Resin and Its Application, Chemical Industry Press, Beijing, 2012, 100
Mi Y., Jiang C. L., Gao Z. H., Polymer Materials Science and Engineering, 2013, 29(11), 140
Modesti M., Lorenzetti A., Simioni F., Camino G., Polym. Degrad. Stab., 2002, 77(2), 195
Shi L., Li Z. M., Xie B. H., Wang J. H., Tian C. R., Yang M. B., Polym. Int., 2006, 55(8), 862
Wang J. Q., Halogen-free Flame Retardant Polymer Fundamentals and Applications, Science Press, Beijing, 2005, 127
Bian X. C., Tang J. H., Li Z. M., Lu Z. Y., Lu A., Journal of Applied Polymer Science, 2007, 104(5), 3347
Shi L., Tian C. R., Zhou Q. M., Lu A., Yang M. B., Li Z. M., China Plastics, 2006, 20(4), 25
Chiang C. L., Hsu S. W., Polym. Int., 2010, 59(1), 119
Zhang X. G., Ge L. L., Zhang W. Q., Tang J. H., Ye L., Li Z. M., J. Appl. Polym. Sci., 2011, 122(2), 932
Ye L., Meng X. Y., Ji X., Li Z. M., Tang J. H., Polym. Degrad. Stab., 2009, 94(6), 971
Wang G. J., Yang J. Y., Surf. Coat. Technol., 2010, 204(21/22), 3599
Xu D. M., Ding F., Hao J. W., Du J. X., Chem. J. Chinese Universities, 2013, 34(11), 2674
Jimenez M., Duquesne S., Bourbigot S., Surface and Coating Technology, 2006, 201(3/4), 979
Yu B., Analysis of Inorganic Chemistry Course, Chemical Industry Press, Beijing, 2002, 93
Moulder J. F., Stickle W. F., Sobol P. E., Handbook of X-Ray Photoelectron Spectroscopy(1st Edition), Physical Electronics Division, Eden Prairie, 1993, 215
Zuo Y. S., Chen W. Z., Liang W., Modern Methods of Material Testing, Beijing University of Technology Press, Beijing, 2009, 214
Bois L., Haridon P. L., Laurent Y., Gouinb X., Grangeb P., Lktard J. F., Birot M., Pillot J. P., Dunogub J., J. Alloys Comp., 1996, 232(1/2), 244
Soraru G. D., Babonneau F., Gervais C., Dallabona N., J. Sol-Gel Sci. Technol., 2000, 18(1), 11
Wang Z., Dong S. M., He P., Gao L., Zhou H. J., Yang J. S., Jiang D. L., J. Eur. Ceram. Soc., 2010, 30(3), 787
Liu Y. J., Feng Y. Q., He C. L., Deng J. G., Ji K. J., Zhang Y. S., Sun S. X., Acta Materiae Compositae Sinica, 2006, 23(2), 65
Thirumal M., Khastgir D., Singha N. K., Manjunath B. S., Naik Y. P., J. Appl. Polym. Sci., 2008, 110(5), 2586
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Supported by the National Natural Science Foundation of China(No.21474008).
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Xu, D., Liu, X., Feng, J. et al. Preparation of boron-coated expandable graphite and its application in flame retardant rigid polyurethane foam. Chem. Res. Chin. Univ. 31, 315–320 (2015). https://doi.org/10.1007/s40242-015-4101-y
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DOI: https://doi.org/10.1007/s40242-015-4101-y