Effect of PAO-Based γ-Fe2O3 and Surfactant Concentration on Viscosity Characteristic

This is a preliminary study on the viscosity characteristics of polyalphaolefin (PAO)-based γ-Fe2O3 under zero magnetic fields. By varying the concentration of magnetic nanoparticles (MNPs), PAO-based γ-Fe2O3 with different concentrations were synthesized by co-precipitation method. The effect of this factor on the viscosity characteristic of γ-Fe2O3 (< 30 nm) was investigated on the basic of a series of rheological measurement. The use of oleic acid (OA) as a coating agent and surfactant was also investigated by varying its concentration. The results show the concentration of MNPs and the amount of OA has obvious effect on viscosity characteristics of PAO-based γ-Fe2O3. In the case of comparison between the concentrations of MNPs, higher concentration of MNPs increased the viscosity of the PAO-based γ-Fe2O3 and exhibit nearly Newtonian behavior. The large amount of OA also exhibits the increment on viscosity characteristic of MNPs. The experimental data were compared with the Bingham and Casson model and the results revealed that the rheology of the polyalphaolefin (PAO)-based γ-Fe2O3 fitted the Casson model better.

Study on the Modified Effect of Wood Fiber by Silane Coupling Agent

In order to improve the interface compatibility of wood fiber and the polylactic acid (PLA), the silane coupling agent to modify the wood fiber was chosen. The Modified Effect of silane coupling agent on the wood fiber is judged inrectly by feat of the modification of viscosity characteristic of the mixed system of wood fiber and the liquid paraffin. The dosage of the silane coupling agent influenced the modification effect the most is shown in the research, the modification temperature, stirring speed and the modification time are followed.

An Investigation on Wetting Characteristics of Solder Particle for Solderable Electrically Conductive Adhesives (ECAs)

A novel electrically conductive adhesives (ECAs) with solder particle have been developed. The kinetics of the curing reaction were investigated using isothermal differential scanning calorimeter (DSC). The dynamic DSC scans were also conducted to investigate the temperature dependant curing degree. The temperature dependant viscosity characteristic of polymer was investigated using rheometer. The wetting characteristic of two solders on two kinds of metals were investigated using an optical microscope. It was found that developed resin material showed good fluxing capacity against Sn-Bi solder on Ni/Au and the wetting angles was about 24º.

Investigations on Impregnation Effects on a Non-Crimp Fiber Bed

Permeability and viscosity are the key input parameters for performing LCM (Liquid Composite Molding). Currently the measurement expenses for the determination of permeability are very high. In order to reduce these expenses and to predict the permeability value in a more theoretical manner the interaction between fiber bed and impregnating fluid has to be clarified. This paper presents an overview about experimental and evaluation techniques in order to identify interaction of fluid and dry fiber structure driven impregnation. Flow experiments are executed using an epoxy resin and a non-crimp fiber bed. Attention is paid to the global flow behavior as well as to the impregnation effects on a mesoscopic level. Additionally the viscosity characteristic of the resin used is investigated. Finally basic micro structural simulations are performed and verified by the evaluation of the flow experiments.