【作者】 秦晓华；

【导师】 聂俊；

【作者基本信息】 北京化工大学 ， 材料学， 2009， 硕士

【摘要】 UV光聚合制备有机-无机纳米复合材料结合了光聚合与纳米复合材料的优点。本论文主要从光聚合体系的核心组份——光引发剂入手,利用光聚合技术制备出有机-无机相通过化学交联的蒙脱土/聚合物复合材料。本论文的主要工作如下:1、利用酸碱中和反应将高效的自由基型光引发剂BDMB(369)季铵化,然后插层引入蒙脱土层间,制备得到可光引发聚合的活性有机土。制备得到的改性有机土与自由基光聚合树脂体系共混后,通过光聚合制备了有机-无机纳米复合材料。实时红外(RT-FTIR)表明制备的可光引发聚合的活性有机土具有较高的引发活性,甚至以1/100(w/w)的活性土在30mW/cm~2的光强下转化率也能达到83%。XRD及TEM研究表明改性有机土以有序剥离和无序剥离的形态分散在聚氨酯丙烯酸树脂聚合物基体中。2、利用合成的三乙氧基硅丙基氨甲酰氧基乙基三甲基碘化铵(APS)与2959IPS的溶胶-凝胶反应将光引发剂2959活性官能团通过阳离子交换插入蒙脱土层间,制备得到可光引发聚合的活性有机土,有机土具有较大的层间距,可达到2.01nm-2.72nm。改性有机土与自由基光聚合体系共混后,通过光聚合制备了有机-无机纳米复合材料。实时红外(RT-FTIR)表明随着2959IPS量的增加,改性有机土具有较快的引发速率和类似的最终转化率,最终转化率可达到89%。XRD和TEM研究表明改性蒙脱土以有序剥离的形式分散在聚氨酯丙烯酸树脂聚合物基体中,制备的蒙脱土/聚合物纳米复合材料具有优异的耐热性能。更多还原

【Abstract】 Preparation of organic/inorganic nanocomposites by UV photopolymerization combines the advantages of both nanocomposites and the UV photopolymerization. Different purposes based on the different UV photopolymerization components in the thesis, and the organic/inorganic components were bonded together through chemical bond. The main results were emphasized.1. A quaternized ammonium photoinitiator (BDMBAC) was synthesized by facile neutralization of BDMB and hydrochloric acid, then ion-exchanged with montmorillonite (MMT). An ordered swollen structure of the intercalated montmorillonite was evidenced by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and thermo gravimetric analysis (TGA). The intercalated montmorillonite also had high photoinitiation efficiency, even only 1/100(w/w) modifled-clay could initiate the radical polymerization with the 83% acrylate conversion on 30mW/cm~2 exposure. X-ray diffraction and transmission electron microscopy (TEM) revealed that the modified montmorillonite layers were uniformly dispersed in the PUA matrix. Thermal properties of the resultant nanocomposites were studied by TGA.2. Photoinitiator 2959IPS was intercalated into the montmorillonite (MMT) clay minerals through sol-gel reaction of triethoxysilanepropylamineformylethyl trimethyl ammonium iodide (APS) and 2959IPS. XRD indicated that the d spacing of the modified clay was enlarged to 2.01-2.72nm. The modified montmorillonite was then mixed with urethaneacylate oligomer and MMT/polyurethane nanocomposites were prepared by photopolymerization. Real-time FTIR (RTIR) results showed the system had different final conversion with different ratios of APS/2959IPS modified montmorillonite. XRD and TEM results showed that the modified-montmorillonite was exfoliated and dispersed in parallelly alignments as multilayers in the organic matrix.更多还原