硅烷功能化蒙脱土/苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物纳米复合材料的制备及性能

摘要

用十六烷基三丁基溴化磷、甲基三甲氧基硅烷连续对钠基蒙脱土( Na+-MMT)进行改性，制得了有机插层蒙脱土( H-OMMT)和硅烷功能化蒙脱土( S-H-OMMT)，并采用熔融共混法制备了功能化蒙脱土/苯乙烯-乙烯-丁二烯-苯乙烯嵌段共聚物( SEBS)纳米复合材料，表征了S-H-OMMT微观结构，研究了S-H-OMMT在SEBS基质中的分散性及复合材料的热稳定性、拉伸性能。结果表明，十六烷基三丁基溴化磷和甲基三甲氧基硅烷对 Na+-MMT 实现了有机化改性， H -OMMT 和S-H-OMMT的层间距相比Na+-MMT增大， H-OMMT呈明显的片层状，而S-H-OMMT的片层更为松散；H-OMMT和S-H-OMMT均与SEBS形成插层结构，后者甚至产生部分剥离结构，相容性明显改善；少量S-H-OMMT(质量分数小于3%)的加入可改善SEBS的热稳定性和拉伸性能。%Na+-montmorillonite ( Na+-MMT) was treated continuously by hexadecyltri-n-butyl phosphonium bromide and methyltrimethoxysilane to obtain intercalated MMT ( H-OMMT ) and silane functionalized MMT ( S-H-MMT ) , and the functionalized MMT/styrene-ethylene-butadiene-sty-rene block copolymer ( SEBS) nanocomposites were prepared via melt blending process. The microstructure of S-H-OMMT was characterized, the dispersion of S-H-OMMT in SEBS ma-trix, and the thermal stability and tensile properties of nano-composite were studied. The results showed that MMT was modified well, the layer spacing of H-OMMT and S-H-OMMT were larger than that of Na+-MMT, H-OMMT exhibited obvi-ous lamellar structure, but S-H-OMMT incompact. H-OMMT and S-H-OMMT dispersed in SEBS matrix all in the form of intercalation, and the latter dispersed even in the partially ex-foliated structure, resulting in improved compatibility. Only by a small amount of S-H-OMMT ( mass fraction less than 3% ) could thermal stability and tensile properties of the SEBS nanocomposites be improved.