标题: 多面体聚矽氧烷奈米复合材料于高性能与低介电性质的研究
Polyhedral Oligomeric Silsesquioxane Related Nanocomposite Materials for the High Performance and Low-dielectric Constant Researches
作者: 李元智
张丰志
应用化学系硕博士班
关键字: 多面体聚矽氧烷;奈米复合材料;POSS;Nanocomposite
公开日期: 2004
摘要: 有机-无机混成复合材料预期能增强原始材料的性质,而奈米级复合材料由于分散尺度(<100 nm)与界面作用力使更具有奇特性质的产生。近年来有种新型多面体聚矽氧烷(POSS)复合材料被高度的重视与研究。由于多面体聚矽氧烷具有固定的矽-氧笼状结构,而且在矽原子上可连接有机官能基,这些官能基可以藉由共聚合方式分散在高分子材料中形成一种新型的奈米复合材料。相对于一般填充料与层状黏土(clay),多面体聚矽氧烷具有固定的结构、高热安定性、低密度与无金属残留等优点,且可与材料达成分子等级的分散。
本次研究将分成三大主题:
一、 多面体聚矽氧烷的基本性质(包含分散性与作用力)。
二、 高性能的多面体聚矽氧烷与聚氧代氮代苯并环己烷(polybenzoxazine)奈米复合材料。
三、低介电的多面体聚矽氧烷与聚亚醯胺(polyimide)奈米复合材料。
合成的化合物已经由核磁共振与红外线光谱证实。热、机械、与相分布是经由热差分析仪、热重分析仪、动态机械分析仪、扫瞄式电子显微镜与原子力显微镜的观察。藉由这些仪器的观察我们发现材料性质与奈米粒子的分散具有高度的关连性。
Hybrid materials containing both inorganic and organic components are expected to have increased performance capabilities relative to their non-hybrid materials. Due to the nano-length scale involved, nanocomposite materials feature an extensive array of interfacial interactions that can result in salient changes relative to their components’ properties. Recently, a novel class of organic/inorganic hybrid material has been developed containing the polyhedral oligomeric silsesquioxane (POSS), which contains an inorganic Si8O12 core surrounded by eight hydrocarbon substituents, or seven of them plus a functional group. Each POSS molecular may contain one or more reactive sites, therefore, it can be easily incorporated into a common polymer. The POSS moiety has a unique structure that can be used for preparing hybrid materials with well defined structures. In contrast to clay or conventional fillers, POSS nanoparticles have the advantages of being monodisperse molecular weight with well-defined structure, lower density, high-temperature stability, and containing no trace metals. Therefore, the experiment work in this study was divided into three parts:
1. The nature properties of the POSS (miscibility and interactions).
2. The POSS-polybenzoxanine nanocomposites for the high performance materials.
3. The POSS-polyimide nanocomposites for the low-dielectric constant materials
The synthetic compounds were confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FT-IR). Thermal, mechanical, properties and phase morphologies of resulted nanocomposites were characterized by differential scanning calorimetry (DSC), thermal gravimetric analysis (TGA), dynamic mechanical analysis (DMA), scanning electron microscopy (SEM) and atomic force microscopy (AFM). We found that good correlations exist between the properties and micro-structures.
URI: http://140.113.39.130/cdrfb3/record/nctu/#GT009025804
http://hdl.handle.net/11536/38125
显示于类别:Thesis