Abstract
Halogen-free flame retardant silicone rubber (SR) composites, using magnesium hydroxide sulfate hydrate (MHSH) whiskers as flame retardant have been prepared by a two-roll mill. Moreover, microencapsulated red phosphorus (MRP) was used as a synergist. Mechanical tests were performed to determine the tensile strength, elongation at break, and shore hardness of the composites. The morphology of fracture surface was observed by environmental scanning electron microscopy (ESEM). The results showed MHSH slightly reduced the tensile strength of the composites, but had obvious influence on the elongation at break. Meanwhile, Shore A hardness presented uptrend with increasing MHSH content. The addition of vinyl silicone fluid (VSF) could improve the compatibility of the MHSH whiskers in SR matrix, and therefore improved the mechanical properties of composites. The flammability properties of composites were investigated by limited oxygen index (LOI), UL-94 tests, and cone calorimetry experiments. It is found that MHSH whiskers can effectively improve the flame retardancy of SR composites due to the endothermic degradation of MHSH whiskers accompanied with the release of water vapor, and the formation of fibrous magnesia acting as a barrier layer. The incorporation of MRP in SR/MHSH whiskers system had a synergic fire retardant effect in the condensed and gas phase. In addition, thermogravimetric analysis (TGA) indicated the presence of MRP enhanced thermal stability of the SR/MHSH composites at higher temperature range, and remarkably promoted char residue yield.
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References
Jana RN, Nando GB, Khastgir D (2003) Plast Rubber Compos 32:11
Mead JL, Tao Z, Liu HS (2002) Rubber Chem Technol 75:701
Wang JC, Chen YH, Jin QQ (2006) High Perform Polym 18:325
Chiu HT, Wu JH (2005) J Appl Polym Sci 97:711
Hornsby PR (2001) Int Mater Rev 46:199
Lu SY, Hamerton I (2002) Prog Polym Sci 27:1661
Wu Q, Lu JP, Qu BJ (2003) Polym Int 52:1326
Pal K, Rastogi JN (2004) J Appl Polym Sci 94:407
Levchik SV, Weil ED (2006) J Fire Sci 24:345
Wu L, Jin ZL, Zhang ZH (2003) Prog Chem 15:264
Ouyang YX, Sui GX, Yang R, Zhuang GS (2006) Mater Manuf Proce 21:191
Zhuang GS, Sui GX, Meng H, Sun ZS, Yang R (2007) Compos Sci Technol 67:1172
Xiang L, Liu F, Li J, Jin Y (2004) Mater Chem Phys 87:424
Ding Y, Zhang GT, Zhang SY, Huang XM, Yu WC, Qian YT (2000) Chem Mater 12:2845
Lu HD, Hu Y, Xiao JF, Wang ZZ, Chen ZY, Fan WC (2006) J Mater Sci 41:363
Liu B, Zhang Y, Wan CY, Zhang YX, Li RX, Liu GY (2007) Polym Bull 58:747
Gilman JW (1999) Appl Clay Sci 15:31
Ma PH, Wei ZQ, Xu G, Bao JQ, Wen XM (2000) J Mater SCI Lett 19:257
Braun U, Schartel B (2004) Macromal Chem Phys 205:2185
Hastie JW, Mcbee CL NTIS, Com-75-11136, 1975
Braun U, Balabanovich AI, Schartel B, Knoll U, Artner J, Ciesielski M, Doring M, Perez R, Sandler JKW, Altstadt V, Hoffmann T, Pospiech D (2006) Polymer 47:8495
Cross MS, Cusack PA, Hornsby PR (2003) Polym Degra Stab 79:309
Nazare S, Kandola B, Horrocks AR (2002) Fire Mater 26:191
Acknowledgements
The work was financially supported by the National Natural Science Foundation of China (No.50403014 and No.50476026), Specialized Research Fund for the Doctoral Program of Higher Education (No.20040358056), Program for New Century Excellent Talents in University, and National 11th 5-year Program (No. 2006BAK01B03, 2006BAK06B06, and 2006BAK06B07).
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Fang, S., Hu, Y., Song, L. et al. Mechanical properties, fire performance and thermal stability of magnesium hydroxide sulfate hydrate whiskers flame retardant silicone rubber. J Mater Sci 43, 1057–1062 (2008). https://doi.org/10.1007/s10853-007-2241-2
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DOI: https://doi.org/10.1007/s10853-007-2241-2