Hexagonal-structured polysiloxane material prepared by sol-gel reaction of aminoalkyltrialkoxysilane without using surfactants
Hexagonal-structured polysiloxane material prepared by sol-gel reaction of aminoalkyltrialkoxysilane without using surfactants
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DOI：
10.1021/cm0495212
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发表时间：
2004-09-07
影响因子：
8.6
通讯作者：
Kitamura, K
中科院分区：
文献类型：
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作者：
Kaneko, Y;Iyi, N;Kitamura, K
采用盐酸、硝酸等强酸催化3-氨基丙基三甲氧基硅烷进行溶胶-凝胶反应制备了高阶纳米结构聚硅氧烷。在 X 射线衍射 (XRD) 图中，该化合物具有三个峰：一个主峰和两个次峰。三个峰的 d 值比率为 1:(1)/(root3):(1)/(2)。这强烈表明六方相的形成。由于湿度的变化峰发生移动，所得产物完全分散在水中。另外，阴离子交换物的各峰的d值根据抗衡阴离子的体积而变化。对于六方介孔二氧化硅来说，无法观察到这种行为。因此，我们估计这种六方相来自于以Si-O-Si骨架为核心、铵基团向外突出的棒状聚合物的堆积。透射电子显微镜（TEM）图像显示出条纹图案，表明棒状聚硅氧烷具有平行堆叠。扫描电子显微镜（SEM）图像显示，聚硅氧烷的聚集体按规则方向排列，表明纳米有序棒状结构影响了微米有序规则结构。这种具有六方相的棒状聚硅氧烷属于一种基于硅氧烷键的新型高有序材料。
A higher-order nanostructured polysiloxane was prepared by the sol-gel reaction of 3-aminopropyltrimethoxysilane catalyzed by a strong acid such as hydrochloric acid or nitric acid. In the X-ray diffraction (XRD) profiles, this compound had three peaks: one prominent peak and two minor peaks. The d-value ratios of the three peaks were 1:(1)/(root3):(1)/(2). This strongly indicates the formation of a hexagonal phase. The peaks shifted due to a change in the humidity and the resulting product was completely dispersed in water. In addition, the d-values of each peak of the anion-exchanged product changed while depending on the bulk of the counteranion. Such behaviors cannot be observed for hexagonal mesoporous silica. Therefore, we estimated that this hexagonal phase came from a stacking of rodlike polymer with Si-O-Si framework at the core and ammonium groups extruding outside. The transmission electron microscopy (TEM) images showed a stripe pattern, indicating that the rodlike polysiloxane had parallel stacking. The scanning electron microscopy (SEM) image showed that the aggregate of the polysiloxane lined up in a regular direction, suggesting that the nano-ordered rodlike structure influences the micro-ordered regular structure. This rodlike polysiloxane with a hexagonal phase belongs to a new type of higher-ordered material, based on siloxane bonds.