Sun Yangyang, Zhang Zhuqing, Wong C P
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.
J Colloid Interface Sci. 2005 Dec 15;292(2):436-44. doi: 10.1016/j.jcis.2005.05.067. Epub 2005 Jul 12.
In order to improve the rheological behavior of the nanosilica composite no-flow underfill, filler surface treatment using silane coupling agents was investigated to reduce the filler-filler interaction and to achieve the mono-dispersity of the nanosilica in the underfill resin. The experimental conditions of the surface treatment were investigated in a design of experiment (DOE) in terms of the pre-treatment methods, coupling agent types, concentrations, and treatment durations. The particle dispersion after treatment was evaluated by the laser particle analyzer and the transmission electron microscopy (TEM). A mono-dispersed nanosilica solution in the polar medium was achieved using optimal experimental condition. The surface chemistry of the nanosilica was studied using Fourier transformed infrared spectroscopy (FTIR). The wettability of underfill resin and water on the silane treated glass slides was studied using a goniometer. Based on the investigations, the silane-treated nanosilica fillers were incorporated into an underfill resin to formulate a nanocomposite no-flow underfill. It was found that the proper filler treatment could significantly reduce the viscosity of the nanocomposite.
为了改善纳米二氧化硅复合不流动底部填充胶的流变行为，研究了使用硅烷偶联剂对填料进行表面处理，以减少填料-填料之间的相互作用，并使纳米二氧化硅在底部填充树脂中实现单分散。在实验设计（DOE）中，从预处理方法、偶联剂类型、浓度和处理时间等方面研究了表面处理的实验条件。通过激光粒度分析仪和透射电子显微镜（TEM）评估处理后的颗粒分散情况。使用最佳实验条件获得了极性介质中的单分散纳米二氧化硅溶液。使用傅里叶变换红外光谱（FTIR）研究了纳米二氧化硅的表面化学。使用测角仪研究了底部填充树脂和水在硅烷处理过的载玻片上的润湿性。基于这些研究，将硅烷处理过的纳米二氧化硅填料加入到一种底部填充树脂中，以配制一种纳米复合不流动底部填充胶。结果发现，适当的填料处理可以显著降低纳米复合材料的粘度。
