Investigation on the effect of process parameters in atmospheric pressure plasma treatment on carbon fiber reinforced polymer surfaces for bonding

Carbon Fiber Reinforced Polymer (CFRP) is used extensively in aerospace applications. Acceptance of bonded CFRP structures, mainly for aerospace applications, requires a robust surface preparation method with improved process controls to ensure high bond quality. Consistent repeatability is a factor lacking from many surface preparation processes. Atmospheric pressure plasma surface treatment is one of the robust surface preparation processes that have drawn wide attention in recent years. This process is capable of being applied in a production clean room environment that would minimize the risk of contamination and reduce cost. In plasma surface treatment the process parameters are easily controlled, documented providing a repeatable process with a high level of consistency. In this paper, the process parameters for atmospheric pressure plasma surface treatment and their effect on bonding for Out-Of-Autoclave (OOA) CFRP composite panels were fully investigated. A mechanized machine with sensory feedback to plasma treat surfaces was developed to change the process parameters for application on larger panels. By the aid of Design of Experiment (DOE) methodology critical process parameters were identified and a mathematical regression model was developed. The mathematical regression model was used to quantify the effect of process parameters on the bonding strength and the model was optimized to find the optimum settings.     

Influence of plasma surface treatment on thermal bonding and flow behavior in Cyclic Olefin Copolymer (COC) based microfluidic devices

The effects of radio frequency (RF) argon (Ar) and oxygenated argon (AO) plasma on the surface chemistry of Topas^R Cyclic Olefin Copolymer (COC), have been investigated. This is necessary because the hydrophobic nature of COC can lead to adsorption of specific compounds from biological fluids channel which can impair precise quantification and cause clogging. Attention was paid to sample storage conditions between treatment and analysis. Hydrophilization at plasma power ratings of 100 W with exposure times from 60 s to 240 s were carried out. The surface roughness was characterized using atomic force microscopy (AFM) and wettability was determined using contact angle measurements. The influence of plasma treatment on the integrity of thermally sealed microdevices was assessed using burst pressure tests. The electro-osmosis flow in the plasma treated microchannels was also investigated.     

激光熔融键合在新型室温红外探测器的应用

运用Nd：YAG激光在功率300W、光束运动速度为0．05m／s、光束直径为700μm的条件下能得到键合强度平均为9．3MPa的硅／玻璃熔融键合效果。该键合方法能进行选择区域键合,完全避免了由于键合过程中电场给超薄敏感可动微结构带来的畸变甚至失效,为新型室温红外探测器的研制奠定了良好的工艺基础。     

可聚合表面活性剂在(微)乳液聚合中的应用

在(微)乳液聚合中用可聚合表面活性剂代替传统的表面活性剂,使提高胶乳的稳定性、得到透明高分子材料等成为可能。着重阐述了可聚合表面活性剂在(微)乳液聚合反应中的作用,介绍了用可聚合表面活性剂通过(微)乳液聚合法制备微孔高分子材料、薄膜材料、功能化材料和有机/无机杂化材料的性能和应用,展望了其研究趋势。