剥离型硅橡胶/黏土纳米复合材料研究

利用层状硅酸盐制备有机 无机纳米复合材料是当前人们研究的热点1,2 ] ,这类材料具有较常规聚合物 无机填料复合材料无法比拟的优点 ,可以明显改善高分子材料的物理机械性能、热稳定性、气体阻隔性、阻燃性、导电性、光学性等 .一般来说 ,聚合物 层状硅酸盐 (Ｐｏｌｙｍｅｒｌａｙｅｒｅｄｓｉｌｉｃａｔｅ ,ＰＬＳ)纳米复合材料可分为插层型和剥离型两种类型 .插层型纳米复合材料即聚合物插入到硅酸盐层中 ,硅酸盐在近程仍保持原有的有序晶体结构 ,在远程则是无序的 .对弹性体而言 ,硅酸盐含量在插层型杂化材料中的含量比较高 ,力学性能…

STUDY ON MECHANICAL PROPERTY OF EXFOLIATED SILICONE RUBBER/CLAY NANOCOMPOSITES

A novel exfoliated silicone rubber/clay nanocomposite has been synthesized by hydroxyl terminated polydimethylsiloxane and organoclay. HTAB and TPAC were used as swelling agents to treat Na montmorillonite for forming organoclay. The organoclay and nanocomposite were confirmed by X ray diffraction (XRD ). The d spacing in TPAC mont is 4 96 nm ,being larger than that of the HTAB mont. The mechanical properties of the nanocomposites have been measured by tensile testing machine. The results proved that the nanometer scale silicate layers of TPAC mont were completely exfoliated in silicone rubber matrix in the cases of 1% to 10% TPAC\|mont content.The nanocomposites exhibit markedly improved mechanical properties and thermal stability when compared with the pure polymer or conventional aerosilica\|filled silicone rubber.A 200%～300% increase in the tensile strength and a 100% increase in the elongation at break were found for TPAC mont/silicone rubber as compared to that of pure silicone rubber.The reinforing and intercalating mechanism of silicate layers in silicone rubber matrix were discussed.