Materials Literature
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Commercial polypropylene pipes for water transport were aged in air at 135 °C and in water at 95 °C for up to 3000 and 4000 h respectively. The protection effect of the antioxidant in the polymer was investigated by measuring the oxidation induction time (OIT) and by determining the chemical changes in the aged polyme…
The powder of supersaturated solid solution of Al-7.8 at%Ti-0.3 at%Fe with a nanocrystalline structure was prepared by mechanical alloying, and it was compacted to columnar shape material at low temperature by application of high pressure of 3 GPa. Diffusion of copper was studied in this compacted nanocrystalline mate…
The NZP family, which gets its name after the prototype composition NaZr2P3O12, has received much attention in recent times because of their very low coefficient of thermal expansion (CTE), controlled lattice thermal expansion anisotropy, fast ionic conductivity, high thermal and chemical stability and flexibility tow…
The behavior of surface and trapped charge that originates during contact electric-field poling of thin films of optically nonlinear polymers has been investigated. Thin films of poly(methyl methacrylate) doped with two different tricyanothiophene chromophores have been studied during and after the poling process by s…
The level of acetate-group surface segregation in poly(vinyl alcohol- co -vinyl acetate) (PVA−PVAc) films was found to depend markedly on the functional group distribution along the backbone (blockiness). PVA−PVAc polymers with both random and blocky distributions were prepared at levels between 2 and 12 mol % acetate…
Alkali-slag cements consist of glassy slag and an alkaline activator and can show both higher early and later strengths than Type III Portland cement, if a proper alkaline activator is used. An examination of microstructure of hardened alkali-slag cement pastes with the help of XRD and SEM with EDAX shows that the mai…
Abstract An update on the examination of the sequence of crossed lines, specifically, between ball point pen strokes (waterfast glycol and aqueous based inks) and faint typewritten impressions (produced by old, poor quality fabric ribbon), utilizing a contemporary Hitachi S-2500 SEM and photographic stereoscopic pairs.
The optical dielectric function of silver is measured by excitation of surface plasmon-polaritons on a silver-covered silica grating for a range of wavelengths in the visible region of the spectrum. By exciting the surface plasmon-polariton at the grating/silver interface the silver is protected from sulphidization an…
The objective of this paper is to introduce a new method for yarn-diameter and yarn-evenness measurement. The relationship between the diameter of a yarn with a circular cross-section and the output voltage of a sensor device is first derived. The yarn cross-section is then analyzed and the ellipticity of its best-fit…
The hydrothermal syntheses of Cs2(WO3)3PO3CH3, Rb2(WO3)3PO3CH3 and (NH4)2(WO3)3PO3CH3, three new non-centrosymmetric, layered tungsten(VI)-containing phases, are described. The crystal structures of Cs2(WO3)3PO3CH3 and (NH4)2(WO3)3PO3CH3 were refined by using Rietveld analysis of powder diffraction data. These phases…
An acoustic system, defined as a liquid-filled piezoceramic shell with an asymmetric internal insertion, is considered. The mathematical model is formulated. The problem of sound radiation by such a system is solved using the partial domains method. The acoustic characteristics of the system for a number of insertions…
Abstract Precision injection molding is an important technology for improving productivity and lowering costs in fields such as electronics, photonics, and medical plastics by allowing the substitution of molded plastics for more expensive metal and ceramic parts. The work in this phase of the program examines correla…
The X-ray crystallography technique has greatly expanded in scope with the development and use of instrumentation at synchrotron sources, particularly in ‘large molecule’ protein crystallography and now also in ‘small molecule’ chemical crystallography. A variety of technical themes are described to illustrate this. S…
The change in the microphase separation transition (MST) temperature of a styrene−butadiene−styrene (SBS) triblock copolymer induced by the addition of polystyrene (PS) was investigated by small-angle X-ray scattering. It was found that the transition temperature was determined from the molecular weight ( M H ) of the…
The microscopic rotational dynamics of a main chain liquid crystalline (LC) poly(ether) in its nematic phase is studied in detail by nonlinear least squares analysis of ESR spectra in the slow motional regime. This complements results reported in an accompanying paper, which focuses on macroscopic translational diffus…
Three perylene tetracarboxylic bisimide chromophores have been attached to a benzene ring in m-position (3). In this way steric and through-bond interactions of the chromophores are minimized and their through-space-interactions can be studied for which an unusually high bathochromic shift has been found. This indicat…
Polyoxazolidones of different crosslink densities were prepared by reacting NCO-terminated oxazolidone quasi-prepolymers with diglycidyl ether of bisphenol A. The NCO-oxazolidone quasi-prepolymers were prepared at a 5/1 NCO/epoxy ratio, utilizing three different types of isocyanates: 4,4'-methylene bis(phenyl isocyana…
Commercial purity (CP) titanium is used primarily in applications requiring exceptional corrosion resistance. The CP titanium alloys contain small amounts of oxygen. The mechanical properties of titanium, such as tensile and fatigue strengths, can be enhanced with oxygen additions, but care must be taken not to compro…
Major thermal decomposition products from polyvinylidene chloride (PVDC) under two pyrolysis conditions (0% O2, and 10% O2) and several different heating rates were determined. Kinetic parameters for the evolution of the major degradation products for polyvinyl chloride (PVC) and PVDC were also determined. Results sho…
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