Advanced Materials Research Vols. 834-836

Abstract: Thin films of transparent conducting titanium-doped zinc oxide (TZO) were deposited by radio-frequency magnetron sputtering technique using a sintered ceramic target of ZnTiO₃. The structural and optical properties of the thin films were characterized with X-ray diffraction and spectrophotometer. The results show that the polycrystalline TZO thin films consist of the hexagonal crystal structures with c-axis as the preferred growth orientation normal to the substrate, and that the titanium doping level significantly affects the crystal structures and optical properties of the thin films. The TZO film deposited with the titanium content of 3 wt% has the relatively well crystallinity, the largest crystal size and the highest average visible transmittance. Furthermore, the optical constants and optical energy gaps of the thin films were determined by optical characterization method.

Abstract: Nano SiO₂ were doped in PI film and then treated with HF solution to get PI microporous membranes. The PI separator was characterized by SEM, thermal shrinkage, AC impendance and charge-discharge experiments. The results show that the thermal performance of PI separator is superior to PP separator and the safety of Lithium-ion battery can be greatly improved.

Abstract: We report on the synthesis and electrochemical properties of multi-walled carbon nanotube (MWNT)/polyaniline (PANI) nanocomposites. The MWNT/PANI composite was prepared through electrochemical polymerization and is confirmed by ultraviolet-visible spectroscopy (UV-vis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The MWNT/PANI nanocomposites show a specific capacitance value as high as 463 F/g.

Abstract: SiO_xCuO_y thin films were prepared by the deposition on to the Si/SiO₂ substrates from the alcoholic solutions employing the sol-gel technique. The various analytic techniques were applied to characterize structure and properties of the films under study . The both X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) studies showed the presence CuO as well as CuO₂ phases and formation of a dual-oxide CuSiO₃ with the average crystallites sizes of 35-50 nm. The conductance of the films was rather sensitive to the presence of 1-20 ppm NO₂ concentration at the operating temperatures in the range of 20–200 ^◦C.

Abstract: 2, 2'- methylene-bis (4,6-di-tert-butyl-phenyl) phosphate sodium (NA-11), a nucleator of polypropylene (PP) was high-efficiently prepared with homemade 2,2-methylene-bis (4,6-di-tert-butyl-phenyl) phosphorus oxychloride as raw materials by means of hydrolysis and neutralization, and the overall yield of the product was 95.9 %. The synthesized product was characterized by Fourier Transform Infrared spectroscopy (FTIR), thermogravimetry (TG), elemental analysis and ³¹P-NMR. Polypropylene was modified with the synthesized product as a nucleating agent. The results showed that the tensile strength, flexural strength, and the flexural modulus of composites increased by 12.1%, 30.2%, 41.0% respectively when the synthesized product is 0.1wt%, and the haze decreased form 42.9% to 17.3%.

Abstract: This paper selects the waste plastics of two typical electronic components of the computer circuit board, which are parallel communication port and slot, the influences of different heating rates and components on the pyrolysis and their kinetics analysis are researched. Pyrolysis experiments are performed under a nitrogen atmosphere, the experimental temperature ranges from room temperature to 1000°C, and heating rates are 10°C / min and 20°C / min. The result shows that the plastics of parallel communication port and slot in the weight loss have similar variation trend, and with the changing of heating rates, the temperature that reach the maximum pyrolysis rates also change. The weight loss rate of slot is lower than the parallel communication port. The pyrolysis rates increase with the increasing of the heating rates, the remainder mass fraction of the same samples are basically the same under different heating rate.

Abstract: The crystallization regimes and spherulitic morphology of poly (trimethylene terephthalate/isophthalate) (TI) random copolyesters were studied in this work. A hot stage polarizing microscope was used to observe morphology and measure growth rate of the spherulite of TI copolyesters. Lauritzen-Hoffman secondary nucleation theory was applied to investigate crystallization kinetics and regimes of TI copolyesters. Results show that the spherulitic growth rate decreased with an increase in isophthalic acid content of the copolyesters. The analysis of Lauritzen-Hoffman secondary nucleation theory shows that regime I, II, and III were observed in TI11 and TI21. Regime III was observed in TI29. The spherulitic morphology of TI11, TI21, and TI29 changed from elliptical-shaped spherulite to irregular spherulite and then to normal spherulite at the regime transitions.

Abstract: Various types of insulating materials in electrical equipment is not only widely used, but also play a crucial role to enhance the insulation of electrical equipment performance and to improve the quality of electrical equipment. Different devices require different types of electrical insulating materials reliability,and in order to improve the safety factor of electrical equipment, it is necessary to strengthen the study on reliability of electrical insulating materials.

Abstract: The influence of accelerator M and accelerator NS on dynamic properties of NR vulcanizate was investigated by using rubber processing analyzer (RPA), flexometer and Nuclear Magnetism Resonance (NMR). The results showed that the degree of crosslinking density of NR vulcanizate by using accelerator NS was higher than NR vulcanizate by using accelerator M, the response of dynamic properties of vulcanizate to frequency and temperature was different, and the NR vulcanizate cured with accelerator NS had lower heat built up than NR vulcanizate cured with accelerator M.

Abstract: RFID is recognized one of the most potential information technologies. The RFID tag is a small tag containing an integrated circuit chip and an antenna. Voids can very often be detected in the non-metalized area of the RFID tags, they generated with unpredictable size and located randomly in the tag. The formation of the voids is the combined action of material properties and bonding parameters. In this work, the formation of the material related voids in the tags was investigated by thermogravimetric analysis. All specimens showed continuous loss of mass to varying degrees during the heating process. The air and moisture entrapped in the polymer matrix in the fabrication process and the process of use are the mainly reason. The loss mass of the etched antenna substrate primarily came from the lamination adhesive has not cured completely. With the simultaneous reaction of thermal stresses and internal vapor/volatile gas pressure drives both pre-existing and newly nucleated voids to grow. In addition, the voids growth under the high temperature (85°C) and high humidity (85%RH) conditions was investigated. The characteristic size of voids increases gradually with the increasing aging time because of the combined effects of the residual stress and the different coefficients of thermal expansion and moisture expansion.