Abstract: This paper presents the investigation of 1-Phenyl-3-hydroxy-1,2,4-triazole as a new green Cu corrosion inhibitor for Electronic Circuit Board in the base electrolyte (containing 60ppm chloride ions,0.54M H2SO4 and 0.88M CuSO4).The inhibition action was investigated by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS).The results show that the inhibition performance depends on the concentration of the inhibitor and the inhibition efficiency increases with increasing inhibitor concentration. Potentiodynamic polarization studies show that 1-Phenyl-3-hydroxy-1,2,4-triazole acts as the mixed-type inhibitor.The results obtained from EIS measurements are in good agreement with that obtained from potentiodynamic polarization.
Abstract: In this paper, microscopic method, transmission technique and attenuated total reflection method of infrared spectroscopy and differential scanning calorimetry were investigated for analyzing the component of inner and outer layer of sheath-core polymer fiber. Results showed that transmission technique and attenuated total reflection method of infrared spectroscopy was a quick and accurate method for identification of sheath-core fiber of fiber.
Abstract: Hollow glass beads / phenolic foam composites were prepared by molding method. The influence of HGB on thermal performance and mechanical properties of phenolic foams were investigated using thermal conductivity measurement, thermogravimetric analysis (TGA) and compression tester. The results show that the addition of hollow glass beads lead to a significant improvement in the compressive property of phenolic foams, with the compressive strength reaching the maximum adding 10% HGB and HGB pretreated by silicane coupling agent further enhance the compressive property. FT-IR spectroscopy shows the reaction between alcohol-OH groups on the surface of HGB and methoxy (-OCH3) groups on silane coupling agent (KH560). The morphology indicates the average cell size decreases with HGB content increasing up to 10%, and again the cell size of foams reinforced by pretreated HGB are better. Addition of HGB improved the thermal stability property of phenolic foams, due to the porosity was mainly responsible for thermal conductivity property of phenolic foams, so HGB filled materials achieved higher thermal conductivity.
Abstract: A facile approach is employed for the preparation of hierarchically porous structures monolithic ordered macroporous-mesoporous silica materials (OMS) using the commercially available and cheap polyurethane (PU) foam as monolithic template, triblock copolymer P123 (EO20PO70EO20) as structure-directing agent and tetraethyl orthosilicate (TEOS) as silica source, then monolithic ordered macro porous-mesoporous carbon materials (OMC) is synthesized by using monolithic ordered macroporous-mesoporous silica materials as hard template and ionic liquids as the carbon source. The silica and carbon monoliths possess uniform pore sizes (3.74-3.84 nm) and ordered mesostructure.
Abstract: With a combined method of theoretic analysis, numerical simulation and uniaxial tensile test experiment research, the properties of bimetal materials are system studied. The researches are concentrated on the followings contexts:The fabricating method of bimetal materials by semi-solid compressive joining is studied by ANSYS, and then the tensile property relationships of the clad material are established. The stress and their strains along x,y and z directions of the clad material are analyzed, respectively. The different performance of composite materials, find materials conform to the existing problems so as to optimize treatment.
Abstract: Curing kinetics of MEP-15/593 system and MEP-15/593/660 system is studied by means of differential scanning calorimetry (DSC). Curing kinetic parameters are evaluated and the relationship between diluent 660 and the curing properties is investigated. The results show that the diluent 660 can not only reduce viscosity and activation energy, but also improve the degree of cure and conversion ratio.
Abstract: Graphite oxide was prepared by acidification assisted Hummers method, which contains acidification, medium temperature and high-temperature three stages. Traditional Hummers low-temperature process was replaced by acidification process. The dosages of acid, graphite and potassium permanganate were investigated, and the produced graphite oxide was treated by ultrasonic oscillation and reduced to graphene by refluxing the reaction mixture at 100°C under open-air conditions. The structure of natural graphite, graphite oxide and graphene were characterized by X-ray diffractometry and infrared spectrum, the morphology of graphene was observed on a scanning electron microscope and the electrochemical properties of graphene were analyzed by the three-electrode cyclic voltammetry test system.
Abstract: Waterbased phosphorous modified phenolic resin was prepared by introducing a phosphorous monomer. Effect of phenol and aldehyde mol ratio and ODOPM content to the stability was studied. The flammability of the prepared composite material was studied by TGA (Thermo gravimetric analysis), LOI (limited oxygen index) and UL-94 test. The results show that stable phosphorous modified phenolic resin can be prepared. TGA, LIO and UL-94 test result show that the hybrid material presents better flame retardancy.
Abstract: Using adipic acid, ethylene glycol and diethylene glycol as the main raw material, the polyester diol was prepared by vacuum melting method. The effects of the dosage of catalyst, the stuff molar ratio of diol and diacid, reaction temperature of the esterification reaction and other factors on the synthesis process of polyester diol were investigated. The optimal conditions of the polyester diol synthesis by vacuum melting method were determined as follows: the stuff molar ratio of diol and diacid 1.10:1, the dosage of catalyst 0.20‰ (the mass fraction of total amount of dicarboxylic acid and diols), the esterification reaction temperature 230 oC. Under such conditions, the esterification reaction time is 5.5 h to get qualified polyester polyol. Additionally, the structure characteristics of polyester glycol were studied by infrared spectrometer (FTIR) and thermogravimetric analyzer (TGA).