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Polyurethanes with pedant quaternary ammonium salts (QAS) have been shown potent antimicrobial properties against gram-positive bacteria but less sensitive to gram-negative ones. Besides, due to using a large amount of QAS chain extenders, Polyurethanes with pedant QAS have been proven to be high water adsorption and even water soluble. In order to solve the two problems mentioned above, Novel polyurethanes...
In this study, three kinds of nonconductive film (NCF) adhesives named as NCF I-NCF II and NCF III, were applied to COF package with compliant-bump. Firstly, to investigate bonding temperature effects, the curing rate of the NCFs and strength of interconnection under different bonding temperatures (150??C ~ 230??C) were evaluated using differential scanning calorimeter (DSC) test and a 90 degree peeling...
The alpha phase oriented PVDF thin films were deposited using vacuum evaporation technology with a DC electric field applied on substrate holder during deposition process. X-ray Diffraction was used to examine the structural variations as a function of applied electric fields. DSC data allowed measurement of the melting temperatures and enthalpies of the PVDF granules and films deposited at various...
A nonlinear transient heat transfer finite element model based on commercial finite element software, ABAQUS, is developed to simulate the curing process of silicone adhesive. The curing reaction process and specific heat of the silicone adhesive were investigated using a differential scanning calorimetry (DSC) to obtain material parameters for numerical simulations. Curing reaction kinetics was derived...
High density polyethylene HDPE/SiO2 nanocomposites were prepared by melt compounding using a twin screw extruder. The thermal properties of the composites were investigated by differential scanning calorimetry (DSC). The microstructures of nanocomposites were characterized by scanning and transmission electron microscopy (SEM and TEM). The dielectric breakdown strength of the nanocomposites was investigated...
Polyethylene oxide (PEO) is a water-soluble polymer that is widely used as a model system to examine fundamental processes. This paper details an investigation into the physical, thermal and electrical properties of PEO-based nanocomposites containing a highly hydrophilic boehmite nanofiller. The boehmite was dispersed into the PEO in solution in distilled water, by using controlled shear conditions,...
In order to improve the oxidation stability of a new insulation oil derived from mineral oil and natural ester, the composite antioxidant used in the oil which were 2,6-ditert-butyl-4-methylphenol (T501) and high-purity alkylation-alpha-naphthylamine (L06) have been selected by using high pressure differential scanning calorimetry (PDSC), and the best concentration of the composite antioxidant in...
Nanodielectrics have been extensively researched in recent years with the expectation that they may enhance electrical performance. In this paper we have studied the electrical conduction processes in linear low density polyethylene (LLDPE) filled with nano alumina particles. The electrical conduction was measured at various applied electric fields. It has been found that the conduction current shows...
The inclusion complex formation of irisquinone with hydroxypropyl-beta-cyclodextrin(HP-beta-CD) and the physico- chemical properties were studied. Complex of host molecules with irisquinoe was studied by x-ray diffraction (XRD) and differential scanning calorimetry(DSC). The quantitative analysis with uv-vis indicated that HP-beta-CD could increase the solubility of irisquinone, where the best results...
A new vanadium-glycine complex (NH4V(Gly)3(PO4)2ldrH2O) was synthesized in hydrothermal condition and characterized by XRD, FTIR, SEM and TG-DSC techniques. The results indicate that glycine and water exist in the crystal framework as ligand coordinating with vanadium. The SEM images show that the single crystals are homogeneous in crystal size and shape, and show a good crystalline performance. The...
The goal of this study was to evaluate the technological feasibility of delivering poorly water-soluble antibacterial agent using chitosan coated alginate/gelatin microspheres. The microspheres were prepared by an emulsification technique, characterized by Fourier transform infrared spectrophotometry (FT-IR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM). Drug loading,...
In this paper, a novel inorganic - organic composite electrolyte was prepared by using titania nanotube (TiNTs) as the filler in polyethylene glycol (PEG) for solid state dye sensitized solar cells (DSSCs). The DSSCs fabricated with optimized composite electrolyte, containing 10 wt% TiNTs in PEG, showed much improved conversion efficiency of 4.5% in comparison with DSSC fabricated with PEG-only electrolyte...
Uncured ethylene vinyl acetate (EVA) is a thermoplastics polymer that has a low glass transition temperature and melting point. To be suited for photovoltaic (PV) module application, EVA has to be cross-linked or cured into a thermoset polymer through the application of peroxide during the module fabrication process, e.g. lamination for crystalline silicon PV modules. A key means of monitoring the...
This paper introduces a class of single crystal silicon micro-scale differential scanning calorimeters for rapid detection and thermal characterization of energetic materials. The suspended membrane micro hotplates have fast time response and high sensitivity, which enables thermal measurements of melting endotherms and deflagration exotherms in energetic materials such as RDX and TNT. The potential...
Crystallization and inner stresses can influence electrical aging properties of insulating material. Heat treatment is one of the most important processes in production of insulating material. This paper presents the growing properties of electrical trees in low density polyethylene (LDPE). The LDPE specimens used for electrical tree experiments are obtained by four different heat treatment processes...
We present a novel room temperature bonding technique using reactive multilayer Ni/Al foils as local heat sources to heat intermediate adhesion layers and thus bond silicon wafers to form wafer level package. Exothermic reactions in Ni/Al multilayer foils were investigated by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). XRD measurements showed that the dominant product after...
A review of polymer cure models used in microelectronics packaging applications reveals no clear consensus of the chemical rate constants for the cure reactions, or even of an effective model. The problem lies in the contrast between the actual cure process, which involves a sequence of distinct chemical reactions, and the models, which typically assume only one, (or two with some restrictions on...
Low temperature bonding technology was developed using In-alloy on Au at a low temperature below 200degC forming robust intermetallics (IMC) joints with high remelting temperature (>300degC), so that after bonding, the IMC joints can withstand the subsequent processes without any degradation. Process parameters on the solder joint were optimized extensively in bonding and annealing process (temperature,...
In this paper, the effects of the degree of cure of an anisotropic conductive film (ACF) on the material properties and the contraction stress build-up of the ACF and ACF joints stability were investigated. The degrees of cure of the ACF as a function of bonding times were quantitatively obtained by a dynamic DSC study and an attenuated total reflectance/Fourier transform infrared (ATR/FT-IR) analysis...
In this study, two highly filled molding compounds were used as example to demonstrate the characterization scheme. In addition, two low filled packaging polymers are included for comparison. The characterization scheme consists of the steps sample preparation, measurement of the material data, and modeling the material behavior. The dasiasample preparationpsila step included a DSC analysis to understand...
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