将聚苯乙烯（PS）树脂与不同种类蒙脱土（MMT）进行熔融复合制备MMT／PS复合材料，通过X射线衍射（XRD）和高分辨透射电镜（HRTEM）对复合材料的微观结构进行了研究。采用SEM、EDX、XRD、氧指数法和锥形量热法研究了复合材料的热分解成炭行为和燃烧性能。结果表明：用蒙脱土原土（NaMMT）制备的NaMMT／PS复合材料是一种简单物理混合物，用有机蒙脱土（OMMT）制备的OMMT／PS复合材料是一种插层-部分剥离型纳米复合材料。MMT与PS质量比为6：100时，OMMT／PS复合材料的热释放速率峰值和平均值分别只有NaMMT／PS复合材料相应值的70．7％和67．4％，火灾性能指数（FPI）是后者的1．2倍，氧指数比后者增加1．0％，热分解残余物表面碳元素含量是后者的2．5倍。OMMT／PS复合材料热分解后在材料表面生成一层厚厚的致密、连续的含碳硅酸盐残余物层，起到良好的阻燃作用，而NaMMT／PS复合材料几乎没有成炭能力，其热分解产物全部来自NaMMT本身的热分解，阻燃性能很差。
Montmorillonite (MMT)/polystyrene (PS) composites were prepared by melt-compounding PS resin and different kinds of MMT. The structures of the composites were investigated by XRD and high resolution TEM. The pyrolytic charring behavior and fire performance of the composites were studied by means of SEM, X- ray energy dispersive spectrometry (EDX), XRD, oxygen index and cone calorimetry experiments. It is shown that the NaMMT/PS composite is a simple physical blend of PS and virgin MMT (NaMMT), while the organic montmorillonite(OMMT)/PS composite is an intercalated- partially exfoliated nanocomposite. When the mass ratio of MMT to PS is 6 : 100, the peak heat release rate(PHRR) and average heat release rate(AHRR) of the OMMT/ PS composite are only 70.7~/6o and 67.4~ that of its NaMMT/PS counterpart, respectively. Meanwhile, the fire performance index (FPI) of the OMMT/PS composite is 1.2 times that of the NaMMT/PS composite, and the oxygen index value of the former is 1.0% higher than that of the latter. The content of carbon element in the residue surface of OMMT/PS composite is 2.5 times that of NaMMT/PS composite. A thick, compact and continuous carbon-containing silicate residue layer is formed on the surface of the OMMT/PS composite, which can effectively inhibit burning. The NaMMT/PS composite hardly has any charring ability. The residue of this composite derives from the pyrolysis of NaMMT completely and it exhibits very poor flame retardancy.
参考文献
| [1] | Qin H L, Zhang S M, Zhao C G,et al. Flame retardantmechanism of polymer/clay nanocomposites based onpolypropylene [J]. Polymer, 2005,46(19) : 8386-8395. |
| [2] | Kiliaris P,Papaspyrides C D. Polymer/layered silicate (clay)nanocomposites: An overview of flame retardancy [ J ].Progress in Polymer Science, 2010,35(7) : 902-958. |
| [3] | Hao X G,Gai G S,Liu J P, et al. Flame retardancy andantidripping effect of OMT/PA nanocomposites [J]. MaterialsChemistry and Physics, 2006,96(1) : 34-41. |
| [4] | Morgan A B, Harris Jr R H T, Kashiwagi T,et al. Flammability of polysturene layered silicate nanocomposites :Carbonaceous char formation [J]. Fire and Materials, 2002,26(2): 247-253. |
| [5] | Gilman J W. Flammability and thermal stability studies ofpolymer layered - silicate (clay) nanocomposites [J]. AppliedClay Science, 1999,15(1) : 31-49. |
| [6] | Zanetti M, Camino G, Mulhaupt R. Combustion behaviour ofEVA/fluorohectorite nanocomposites [J]. Polymer Degradationand Stability, 2001, 74(3); 413-417. |
| [7] | Laoutid F, Bonnaud L, Alexandre M, et al. New prospects inflame retardant polymer materials: From fundamentals tonanocomposites [J]. Materials Science and Engineering R. 2009,63(3): 100-125. |
| [8] | Qin H L, Su Q S, Zhang S M,et al. Thermal stability andflammability of polyamide 66/montmorillonite nanocomposites[J]. Polymer, 2003,44(24): 7533-7538,. |
| [9] | Wang J Q. Du J X, Zhu J, et al. An XPS study of the thermaldegradation and flame retardant mechanism of polystyrene-claynanocomposites [J]. Polymer Degradation and Stability,2002, 77(2): 249-252. |
| [10] | Hu Y,Tang Y. Song L. Polypropylene/clay nanocompositesand their application in flame retardancy [J]. Polymers forAdvanced Technologies, 2006 , 17(4) : 235-245. |
| [11] | Bourbigot S, Duquesne S, Jama C. Polymer nanocomposites:How to reach low flammability [ J ]. MacromolecularSymposia, 2006,233(1) : 180-190. |
| [12] | 胡源,宋磊.阻燃聚合物纳米复合材料[M].北京:化学工业出版社,2008: 76-77. |
| [13] | 杨子芹,刘卫卫,杨小兵,等.纳米填料改性丁基橡胶复合材料的力学性能、芥子气防护性能和燃烧性能[J].复合材料学报,2009, 26(6): 25-30. |
| [14] | 黄国波,髙建荣,贾建洪,等.有机磷氮系-蒙脱土/LDPE纳米复合材料的制备及阻燃性能[J].复合材料学报,2010,27(6): 45-52. |
| [15] | 刘继纯,付梦月,李晴媛,等.有机蒙脱土和氢氧化镁对PS的协同阻燃作用研究[J].中国塑料,2008,22(12): 84-87. |
| [16] | 刘继纯,陈权,井蒙蒙,等.有机蒙脱土/聚苯乙烯复合材料的燃烧性能与阻燃机制[J].复合材料学报,2011,28(6):50-58,. |
| [17] | Carty P, White S. Char formation in polymer blends [J].Polymer, 1994,35(2): 343-347. |
| [18] | Carty P, White S. Iron -chlorine interaction in blends of poly(vinyl chloride) and acrylonitrile - butadiene - styrenecontaining basic iron (IE) oxide [J]. Polymer, 1995, 36(5):1109-1111. |
| [19] | Carty P, White S. Flammability of polymer blends [ J ].Polymer Degradation and Stability, 1996, 54(2) : 379-381. |
| [20] | Lu H D, Wilkie C A, Ding M, et al. Flammabilityperformance of poly ( vinyl alcohol) nanocomposites withzirconium phosphate and layered silicates [ J ]. PolymerDegradation and Stability, 2011,96(7) : 1219-1224. |
| [21] | Wang Z Y, Liu Y, Wang Q. Flame - retardantpolyoxymethylene with aluminium hydroxide/melamine/novolac resin synergistic system [J]. Polymer Degradation andStability, 2010, 95(6): 945-954. |
| [22] | 刘继纯,陈权,井蒙蒙,等.PS/PPO合金的燃烧行为研究[J].塑料科技,2011,39(4): 35-39. |
| [23] | 李斌,王建祺.聚合物材料燃烧性和阻燃性的评价——锥形量热仪(Cone)法[J].高分子材料科学与工程,1998,14(5): 15-19. |
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