Materials Literature
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Polyamides were one of the earliest powder coatings invented for metal protection and soon established recognition for their physical toughness, visual attractiveness and compatibility with potable water and foodstuffs. The available polyamides today can be derivatives from both crude oil and castor oil refining proce…
The dependence of the strain energy of anion-cation bonds on the sum Ψ2 of squares of the angles of ordered rotations of octahedra around the coordinate axes of the reduced cell has been determined for ABX 3 compounds with perovskite structure in the two-particle approximation. A relation determining the change in the…
A thermodynamic approach to predicting the compatibility of the binder with the filler by calculating the nonpolar and acid-base parameters of the filler and polymeric matrix was considered. The calculated adhesion stabilities of the composite systems are consistent with the structural and functional features of their…
Gel permeation chromatography with differential refractometry is used to obtain molecular weight distributions (MWD) of poly-(epsilon-caprolactams). Elution is carried out using an m-cresolchlorobenzene mixture (50:50, v/v) at 50 degrees C. MW values are obtained by a Hamielec-based calibration method, using broad-MWD…
The author offers counterpoint commentary in response to Shaffer's suggestion that the Lewis acid–base approach be applied to reactions such as ammonia–water and HCl–water.
The effect of yarn twist on the wicking rate of cotton interlock weft knitted fabrics has been studied. It is observed that using the yarn linear density of 30tex, the wicking rate decreases with an increase in the amount of yarn twist. An equation ‘h=cT+d’ is found to be a good estimate of the maximum wicking height…
Article Crystal structure of bis(2,2′-bipyridine-N,N′)dibromomanganese(II), MnBr2(C10H8N2)2 was published on September 1, 2007 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 222, issue 3).
This paper describes how irradiation with light influences the preparation of Au-Ag-Hg trimetallic nanoparticles (NPs) from gold nanorods (AuNRs) in glycine solutions (pH 8.5-10.5). Silver, gold, and mercury ions were reduced by ascorbic acid and deposited on AuNRs to form Au-Ag-Hg trimetallic NPs of different sizes a…
The synthesis of catalytic filamentous carbon (CFC) on a Ni catalyst supported by homogeneous precipitation onto the surface of aluminosilicate ceramic supports (honeycomb monoliths, ceramic foam, glass foam, and haydite) was studied. The effects of CFC synthesis conditions (the catalyst concentration on a support, th…
The ring‐opening polymerization (ROP) of ϵ‐caprolactone (CL) using γ‐hydroxy‐α‐methylenebutyric acid (HMBA) as the initiator was studied. The use of stannous octoate (Sn(Oct)2) and Novozym 435 (Lipase B from Candida Antarctica) as catalysts was compared. Under enzymatic conditions, poly(ϵ‐caprolactone) (PCL) with well…
The oxidation of molybdenum sulphide concentrate by water vapour at high temperatures has been investigated experimentally. The progress of the reaction was followed by a thermogravimetric analysis unit and the exit gas was analysed to determine its composition. The conditions under which the water vapour oxidation pr…
Abstract The thermal oxidation of an unvulcanized, unstabilized polyisoprene rubber (IR) has been studied in the 40–140 °C temperature range. Ageing was monitored by FTIR determination of double bonds and carbonyl groups, mass uptake measurement, and weight average molar mass determination. A mechanistic scheme based…
Measurements of transverse momentum fluctuations can be used to determine the shear viscosity [1]. We use current data to estimate the viscosity-to-entropy ratio in the range from 0.08 to 0.3, and discuss how future measurements can reduce this uncertainty.
Metallic nuclear fuels are being looked at as part of the Global Nuclear Energy Program for transmuting longlive transuranic actinide isotopes contained in spent nuclear fuel into shorter-lived fission products. In order to optimize the performance of these fuels, the concept of using liners to eliminate the fuel/clad…
Polyvinyl chloride (PVC) is one of the most widely used polymers today. One of its major applications is in electrical and control cables. Although PVC is intrinsically self-extinguishing, it supports flame spread along its length because of the additives used during processing. The spread of fire along electrical cab…
ABSTRACT Electron backscatter diffraction (EBSD) is used to determine the detailed crystallographic orientation of calcite crystals of craniid brachiopods in the context of shell ultrastructure. Sections of shells of two Recent species, Novocrania anomala and Novocrania huttoni , are analysed to provide 3D crystallogr…
Peculiarities of the synthesis of crosslinked epoxyurethane polymers prepared by two main reactions such as “cyclic carbonate-amine” with the formation of linear hydroxyurethane fragments and “epoxide-diamine” to form crosslinked polymer are considered. It is shown that the acidolysis of cyclic carbonate proceeds by t…
The relationship between the ratio of the applied force on warp yarn by backrest roller to the warp tension, and the radius of backrest roller, the vertical position of backrest roller and the horizontal position of backrest roller with variations in warp beam radius during weaving process has been studied. The optimu…
In this paper, we report the electrochemical polymerization of 3-decylthiophene at room temperature using the 1-butyl-3-methylimidazoliumtetrafluorborate as solvent. The polymer film is electroactive and its morphology depends upon the anode used. The polymerized 3-decylthiophene was characterized by ft-infrared, uv-v…
Crack formation in a nickel bicrystal wire of radius 16 nm with a negative junction disclination lying along the axis has been studied by computer simulation. It has been revealed that at a disclination strength exceeding some critical value (approximately 17°), a crack is formed in the region of the disclination core…