Materials Literature
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Abstract A simplified and realistic kinetic scheme was proposed for the cure reversion mechanism of accelerated sulfur vulcanization for gum natural rubber (NR) compounds. The vulcametric curves at different temperatures were simulated from curing to overcuring periods by using a kinetic approach. The different rate c…
Microstructural characterization of Achatina fulica Bowdich, 1822 epiphragms and mucus secretions was performed to address two questions: what are the structure and composition of the reinforcing inorganic phase in the epiphragms, and what enables a durable epiphragm to form quickly in comparison to other biomineraliz…
For some cyclic aliphatic urethanes (dimethylene urethane, trimethylene urethane, 2-methyltrimethylene urethane, 2,2-dimethyltrimethylene urethane, tetramethylene urethane) and the corresponding linear polyurethanes (poly(dimethylene urethane), poly(trimethylene urethane), poly(2-methyltrimethylene urethane), poly(2,2…
There have been few applications of conductive polymers as antistatic agents for poly(ethylene terephthalate) (PET) films for packaging, since they lack formability and transparency. A new antistatic film has been developed by coating PET with an alcohol-water solution containing a water soluble conductive polymer, su…
In thin work. the corrosion behavior of iron and aluminum was investigated in 0.1 M NaCl solutions with an initial pH value of 8 and containing various concentrations (0. 30, 150 300 ppm) of benzoic acid. For this purpose, the anodic and cathodic semilugarithmic current-potential curves. weight loss and pH of the solu…
Magnetic domain structures on single-crystalline magnetite (Fe3O4) particles, prepared by microfabrication techniques from molecular-beam epitaxial (110) magnetite films grown on MgO, were studied by magnetic force microscopy. The (110) magnetite film thickness was 250 nm and the patterned particles ranged in size fro…
Rates of the recovery of tritium from a blanket of a fusion reactor with a 1 GWt power are estimated. The recovery methods are a permeation window, a Flibe-He counter-current-extraction tower and a rotational centrifugal flow system. There is high possibility in that the rate-determining step of the permeation window…
The coordination environments of Pt impurities in a ternary K‐aluminophosphate (KAP) glass and commercial K,Mg‐aluminophosphate (KMAP) laser glasses have been investigated by Pt L III ‐edge X‐ray absorption fine structure (XAFS) spectroscopy. Pt valence in the KAP glass depends on the melt preparation atmosphere. Pt 4…
The influence of the interstitial elements H, B, C, N and O on the bulk modulus and the theoretical strength of alpha-Ti was investigated using the discrete variational method under the local density approximation from first principles. The electronic structure and the total and binding energies were first evaluated w…
At the Tritium Laboratory of the Forschungszentrum Karlsruhe (TLK) an experimental facility is running which is designed for the intercomparison of several hydrophobic catalysts for use in an liquid phase catalytic exchange (LPCE) column. The catalysts under comparison are from Russia, Belgium and Romania. The interco…
The degradation pathways for polymeric materials and coatings under the influence of light and oxygen are presented and the consequent need for light-protecting agents (light stabilisers) is discussed. The mechanisms of action of hindered amine light stabilisers and certain UV-absorbers are explained. The use of light…
In a previous article, a sharp change in the birefringence and density of polypropylene fibers was reported at the edge of thermal point bonds in nonwovens. In this article, similar results are shown for polyester nonwovens. First, in both isotactic polypropylene (ipp) and poly(ethylene terephthalate) (PET), the morph…
Themorphologies and structures of single crystals of syndiotactic poly(propene- co -1-butene) (PPBU) with 1-butene contents of 2.6, 4.2, 9.9, 16.2, and 47.9 mol % are studied by transmission electron microscopy and electron diffraction. The electron diffraction results show that the 1-butene units are included in the…
While nonrandom associations between zygotes at different loci (zygotic associations) frequently occur in Hardy-Weinberg disequilibrium populations, statistical analysis of such associations has received little attention. In this article, we describe the joint distributions of zygotes at multiple loci, which are compl…
Zinc selenide is an infrared transparent semiconductor material being considered for use in space as an infrared optical coating. In this work, zinc selenide thin films of different thicknesses were exposed to an electron cyclotron resonance generated oxygen plasma, often used to “simulate” the low earth orbital envir…
Micromachining of crosslinked PTFE (polytetrafluoroethylene) using synchrotron radiation direct photo-etching method has been demonstrated. High aspect-ratio microfabrication was carried out. The etching rate of crosslinked PTFE was higher than that of non-crosslinked PTFE. Through the etching rate measurements of var…
We have performed numerical calculations to study the generation of arbitrary temperature profiles with high spatial resolution on the surface of a solid. The characteristics of steady-state distributions and time-dependent heating and cooling cycles are examined, as well as their dependence on material properties and…
Electrochemical potentiodynamic polarizations, electrochemical corrosion potential (ECP) measurements and slow strain rate tensile (SSRT) tests were conducted to investigate the intergranular stress corrosion cracking (IGSCC) characteristics of Type 304 stainless steels treated with inhibitive chemicals in simulated b…
Pt/SiO 2 nanosized particles have been synthesized using a reverse micelle technique combined with metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilan…
Arsenic pentachloride has a trigonal bipyramidal structure in the solid state with As-Cleq = 210.6, 211.9 pm, As-Clax= 220.7 pm, space group Pmmn, a = 706.2 (1); b = 760.3 (2), c = 623.3 (1) pm. Antimony pentachloride exists in two modifications: above −54.1 °C it is also trigonal bipyramidal with Sb-Cleq = 227.0 and…