Materials Literature
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Abstract A review of good weatherability requirements for PVC profiles is presented. Analytical tools to assess these requirements are recalled and justified. Detailed analysis of the various parameters that may affect PVC weatherability show that except for a few additives, the key point is the level of thermal degra…
Abstract Hydroformylation of propylene has been conducted by a polymer‐protected rhodium colloid catalyst with an activity of 130 mol butanal / g atom Rh·h. The neat colloid catalyst is stable enough for repeated use for 7 times lasting ∼50 h under the reaction condition (temperature: 363 K, pressure: 40 bar) with a t…
To quantify the thermally activated relaxations of the mobile silver ions in superionic silver phosphosulphate ${({\mathrm{Ag}}_{2}\mathrm{S}{\mathrm{O}}_{4})}_{x}{(\mathrm{AgP}{\mathrm{O}}_{3})}_{(1\ensuremath{-}x)}$ and phosphosulphide ${({\mathrm{Ag}}_{2}\mathrm{S})}_{x}{(\mathrm{AgP}{\mathrm{O}}_{3})}_{(1\ensurema…
Composite thin films produced by depositing alternating layers of various PLZT compositions were fabricated on Pt-coated Si wafer and Ag foil substrates. Films were prepared by MOD processes including automatic spin and dip coating from acetate precursors followed by annealing at 700°C. Ferroelectric (FE)/antiferroele…
A laboratory study was conducted of the corrosion of copper in synthetic tap waters with various chemistries under stagnant conditions at room temperature. The primary interest was the effect of sulfate ion concentration ([SO42−]) on general corrosion and localized attack. Short-term tests were conducted using electro…
X-ray photoelectron spectroscopy was used to study the thermal stability of silver in ion-exchanged sodium calcium silicate glasses during heat treatment in ultrahigh vacuum. The changes in concentration, in line shape, and in binding energy as functions of sample temperature show that silver diffuses toward the surfa…
A solution for the transmittance of elements forming planar and nonplanar focal curves in the non-paraxial case is proposed in this paper. The treatment is based on the scalar diffraction theory and makes use of the stationary phase method in evaluation of the diffraction integral. The equation of a stationary point e…
Tussah silk fabrics have been chemically modified by pad‐batch treatment with ethyleneglycol diglycidyl ether (EDGE). The maximum amount of weight gain attained was 5–6%. Epoxide adducts were formed with tyrosine and basic amino acid residues. The moisture regain of the fabric with 3% weight gain decreased slightly co…
New thermally stimulated depolarization currents (TSDC) results on LLD polyethylene functionalized with diethylmaleate polar groups are precisely computer fitted with the direct signal analysis technique. It is shown that the TSDC spectrum consists, with increasing temperatures, of a sub-γ peak, a sharp γ peak, and a…
The magnetic properties, including ac core loss, dc hysteresis loss, eddy current loss, ac and dc permeability at 10 kG and 15 kG, and magnetic flux density at field strength 2500 A/m, of 17 heats of fully processed, continuous-annealed low-carbon electrical steels with grain diameter from 8.98 /spl mu/m to 23.25 /spl…
By combining a low temperature (600 °C) chemical vapor deposition process for homoepitaxial diamond and conventional ion implantation, we have made and lifted off a synthetic diamond single crystal plate. Before growth, a type Ia C(100) crystal was exposed to a self implant of 190 keV energy and dose of 1×1016 cm−2. H…
Abstract The propagation rate coefficient k p for the free‐radical polymerization of 1,3‐butadiene was determined as a function of temperature in the range of 30–60°C in bulk and as a function of the concentration of 1,3‐butadiene in chlorobenzene at 50°C using a combination of a UV flash‐lamp induced polymerization a…
If the unit-cell distribution of atomic mean-square displacement parameters B = 8pi(2)<u(2)> is assumed to be normal, with mean micro = <B> and variance sigma(2) = <(B-<B >)(2)>, the statistical expectation value of the Debye-Waller factor W(2) = exp(-2Bs(2)), where s = (sin theta)/lambda, is <W(2)> = exp[-2( micro -…
Nucleophilic aromatic substitution reactions of 3-nitrophthalonitrile yield 3-hydroxyphthalonitrile and 3-neopentoxyphthalonitrile, the latter of which condensed to 1,8,15,22-tetraneopentoxyphthalocyanine as a mixture of isomers. Bisphthalonitriles such as 1,3-bis(2′,3′-dicyanophenoxy)-2,2-dipentylpropane, 1,3-bis(2′,…
The study relates the grinding power of different grades of sintered alumina abrasives to their microstructures and to basic mechanical properties in comparison with conventionally fused electrocorundum and with an electrofused alumina/ zirconia eutectic. Contrary to the traditional approach of the Battelle test, the…
This paper describes the experimental studies conducted to date to investigate the stress corrosion cracking (SCC) of candidate container materials for the proposed high-level nuclear waste repository at Yucca Mountain, Nevada. The effects of environmental variables, such as chloride (Cl−) concentration, the addition…
The liquid crystalline phases of several rigid-rod, non-polar tolane oligomers are characterized by differential scanning calorimetry and transmitted polarized light microscopy. We determine that a stable nematic phase can be formed at ambient pressure if the molecular axial ratio (length-to-width ratio) is greater th…
Abstract SrS thin films were grown on uncoated or Al 2 O 3 ‐coated soda lime glass substrates from hydrogen sulfide and Sr(thd) 2 (thd = 2,2,6,6‐tetramethyl‐3,5‐heptanedionato) by the atomic layer epitaxy (ALE) process. Sr(thd) 2 was prepared from Sr, SrO, Sr(OH) 2 or SrCO 3 and Hthd inside the reactor during the depo…
As a result of incompatibility, Eucalyptus gunnii showed in the graft area of in vitro micrografts a typical accumulation of gallic, ellagic, gentisic and p-coumaric acid: (+)-catechin also increased in concentration. In compatible grafts, a lower concentration of phenolics accumulated. The possible role of both speci…
Abstract 1,3-Disubstituted tetrabutyldistannoxanes effectively catalyze direct condensation polymerization of water-containing l-lactic acid to afford a high-molecular-weight polymer.