Materials Literature
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This paper reports a study on the effect of phase change material (PCM) in design of cold protective clothing. Two clothing systems with the same structural design, one was smart clothing (clothing C) was treated with PCM, the other one was moisture management clothing (clothing B), were tested in a climate chamber wh…
Abstract The effect of red phosphorus was found to be effective for flame‐retardancy of a pure cotton fabric. The laundered bone‐dried weighed samples were impregnated with red phosphorus at suitable concentrations. Vertical flame spread test was accomplished. The optimum add‐on value to impart flame‐retardancy onto c…
The vanadium orthoborate VBO 3 was synthesized under high-pressure / high-temperature conditions of 7.5 GPa and 1250 °C in a Walker-type multianvil apparatus. The crystal structure was determined on the basis of single crystal X-ray diffraction data, collected at r. t. The title compound crystallizes in the trigonal c…
Recyclization of poly (ethyleneterphthalate), (PET), with Diethanolamine and Triethanolamine having 1:2 wt% of PET: wt% of DEA or wt% TEA, in presence of manganese acetate as a catalyst. The inhibition action of the prepared compounds (D2 & T2) on the corrosion of carbon-steel which used in the manufacture of petroleu…
Polymer nanocomposites are defined as polymers in which small amounts of nanometer size filers are homogeneously dispersed and will have a potential significant impact on materials mechanical, electrical and thermal properties etc. In power industry, electrical insulating polymers usually incorporate inorganic fillers…
This paper focuses on the development of insulation systems for high-speed and hence high-frequency electric motors with multi-MW ratings. With the growing demand for variable speed applications, an increasing number of medium and high voltage (4-13.8 kV) motors are being powered by adjustable speed drives (ASD's). On…
The effect of microwave irradiation (MW, 1.55 kW at 2450 MHz on the dissolution chitosan(CHI) and on the properties of the solutions was studied and the results compared with those obtained by using mechanical stirring. MW effects were tested by analysing the viscosity of the solutions as well as the properties of the…
At present, the detection methods of electric device faults are often undertaken by infrared imaging system, ultrasonic imagining system, etc. However, these techniques have some inherited shortcomings. As to the high insulation level of an ultra high voltage system, the long distance from ground exists. Thus it needs…
Multiwalled carbon nanotube (MWCNT) reinforced and unfilled epoxy resins were prepared. Viscosity tests were run on the MWCNT filled and unfilled resins, comparative tensile, three point bending and Charpy impact tests were performed. The viscosity of MWCNT filled epoxy resin has increased by from three to one order o…
Abstract A principal possibility of the utilization of polymer peroxides for the modification of polymer surfaces that provides an immobilization of the tailored quantity of peroxide groups at them has been established. The processes of polymer surface activation with following “grafting from” or “grafting to” utilizi…
A novel diamine monomer containing the alicyclic unit 1,4‐bis(4‐aminophenoxymethylene) cyclohexane (BAMC) was synthesized successfully and employed in the preparation of polyimides with two aromatic dianhydrides by a two‐step procedure. Experimental results indicate that the resulting polyimides show exceptional therm…
Syntactic foam is a special kind of composite material. It usually consists of a polymer matrix (called binder) and hollow spherical particles with a diameter in the range of 20 - 120 mum (microspheres) which are mixed into the binder. Due to the gas in the microspheres, the material structure of syntactic foam is sim…
Novel porous polyimides (PIs) having diameters of several hundred nanometers have been fabricated successfully from precursor poly(amic acid) (PAA) derivatives with poly(acrylic acid) (PAS) as the porogen, using a reprecipitation method and subsequent imidization. The superficial high porosity with deep pores was intr…
This paper addresses some specific design issues encountered in the development of isolation transformers for the rolling stock auxiliary power supply (APS). The optimal transformer design rule of the copper and core loss equalization will not work for middle-frequency (500...3000 Hz) high-power transformers. Main att…
We demonstrate the printing of carbon nanotube (CNT) solution using the electrostatic inkjet nozzle and the field emission from the printed CNT. The CNT solution was prepared from the water-soluble single-wall CNT. An electrostatic inkjet nozzle having a needle inside a capillary was built in-house, which was able to…
Defects in the SF6medium voltage (MV) switchgear can result in failure. Therefore it is important to detect defects, such as protrusion and particle, in time and to determine their risk for a possible breakdown. For high voltage apparatus, the ultra high frequency (UHF) partial discharge (PD) detection technology has…
We report the preparation of p-type ZnO thin films on (0001) sapphire substrates by a combination of sol-gel and ion-implantation techniques. The results of the Hall-effect measurements carried out at room temperature indicate that the N-implanted ZnO:Al films annealed at 600°C have converted to p-type conduction with…
A technique for spinning continuous filaments constructed of nano-scale fibers instead of non-woven obtained by general electrospinning was described in the paper. Polyamide 6/66 copolymer solution in 88% formic acid was used as the spinning material. The relationships between the fiber microstructures, filament mecha…
The hydration of kotoite, suanite, and szaibelyite with ultimate brucitization was considered by the example of skarn deposits of endogenous magnesium borates. This process involves isomorphic substitution of hydroxyl groups for equivalent amounts of boron radicals. The degree of kotoite hydration varies from 2 to 40%…
Ultra-high-molecular-weight polyethylene (UHMWPE) is a versatile polymer employed in many fields for its good chemical–physics characteristics. In particular, it is widely utilized in biomedical fields due to its high degree of biocompatibility and its easy control on wettability of the surface. In this work, the lase…