Materials Literature
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Using calorimetry and scanning electron microscopy we have investigated the formation energetics and kinetics as well as the phase behavior of an ultraviolet-cured polymer-dispersed liquid crystal (PDLC) system. The purpose of this work was to determine those cure conditions which lead to liquid crystal microdroplet f…
Abstract The effect of crosslinking on the stress ‐ strain curves and on the crack growth rate was investigated in three point experiments for notched samples of polyethylene, polypropylene, blends of PE and polypropylene, and PE filled with silica. The crosslinking was found to affect positively the tear resistance o…
Abstract— Several porphyrin esters used as models for polystyrene‐bound porphyrins have been prepared and their excited states have been studied by laser flash photolysis, IR phosphorescence of singlet molecular oxygen, O 2 ( 1 Δ g ), and steady‐state fluorescence. The photophysical properties of the porphyrin esters…
The apical third of 60 standardized, gutta-percha cones obtained from six different manufacturers were analyzed by scanning electron microscopy. Despite the fact that the majority of the commercial gutta-percha cones showed rather uniform and smooth surfaces, some displayed morphologic variations such as gross protube…
A SEM procedure for quantifying the percentage area of transgranular fracture and surface roughness was developed to study the fracture morphologies of stable and rapid crack growths in ceramics and ceramic matrix composites. The procedure utilizes software which interprets the SEM line scanning profiles. Results obta…
One option available to the design engineer who requires a permanent joining of thermoplastic parts is to weld them together.
A kinetic investigation of the ammoxidation of toluene was carried out over a TiO,(B)-supported vanadium oxide catalyst with a loading corresponding to a theoretical monolayer. The partial pressures of reactants toluene, oxygen, and ammonia were varied, and rates were measured for the formations of benzaldehyde and be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAbsorption and resonance Raman spectra of bis(porphyrin)europium(1+) complexes: oxidation-induced enhancement of porphyrin-porphyrin .pi..pi. interactionJing Huei Perng, John K. Duchowski, and David F. BocianCite this: J. Phys. Chem. 1991, 95, 3, 1319–1323Publication Date (P…
The microstructure and microchemistry of grain‐boundary regions in (CeO 2 + La 2 O 3 )‐stabilized tetragonal ZrO 2 polycrystals (Ce(La)‐TZP) were studied by means of transmission electron microscopy (TEM). Evidence was found for the existence of crystalline and vitreous intergranular phases situated in small pockets a…
The effects of potential step polarization and hydrogen overpotential on crack propagation and crack arrest are investigated for T-250 maraging steel (yield strength = 1708 MPa [248 ksi]) and PH 13-8 (UNS(1) S13800) steel (yield strength = 1467 MPa [213 ksi]). The critical stress intensity threshold for hydrogen-assis…
<div class="htmlview paragraph">Performance and fuel consumption of a single-cylinder, direct-injection diesel engine were determined for both an untreated diesel fuel and for the same fuel treated with a platinum-based fuel additive package. The platinum was in an organometallic compound which was soluble and s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMore on the scattering function of helical wormlike chainsKyosuke Nagasaka, Takenao Yoshizaki, Jiro Shimada, and Hiromi YamakawaCite this: Macromolecules 1991, 24, 4, 924–931Publication Date (Print):February 1, 1991Publication History Published online1 May 2002Published inis…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn x-ray crystallographic and high-field NMR study of chromium complexes [(C6Et6)Cr(CO)2NO]+BF4- and [(C6Et6)Cr(CO)(CS)NO]+BF4-: steric inhibition of tripodal rotationBavani Mailvaganam, Christopher S. Frampton, Siden Top, Brian G. Sayer, and Michael J. McGlincheyCite this:…
Abstract Selective Catalytic Reduction (SCR) has been applied as a NOx abatement technique for stationary sources of nitrogen oxides (NOx) in Japan since the early 1970s. To date, there are over 100 SCR installations operating in Japan. During the 1980s, a number of SCR systems have been installed in the United States…
Planar impact experiments were employed to induce dynamic tensile failure in Bedford limestone. Rock discs were impacted with aluminum and polymethyl methacralate (PMMA) flyer plates at velocities of 10 to 25 m/s. Tensile stress magnitudes and duration were chosen so as to induce a range of microcrack growth insuffici…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear complexes of copper(II) derived from (1,3-propanediylbis(oxamato))cuprate(II): magneto-structural correlationsJoan Ribas, Auxiliadora Garcia, Ramon Costa, Montserrat Monfort, Santiago Alvarez, Claudia Zanchini, Xavier Solans, and Maria Victoria DomenechCite this: I…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of deactivation of methylation of toluene over H-ZSM-5 and hydrogen mordenite catalystsRamakrishna Mantha, Subhash Bhatia, and Musti S. RaoCite this: Ind. Eng. Chem. Res. 1991, 30, 2, 281–286Publication Date (Print):February 1, 1991Publication History Published onli…
Through controlled thermal decomposition of cobalt acetate tetrahydrate, cobalt monoxide can be synthesized with three different crystal structures: rock salt, zinc blende, and wurtzite. Using electron microscopy techniques, it is shown that the polymorphs exhibit characteristic crystallite morphologies; “tetrahedral”…
Abstract In an attempt to understand the fatigue crack initiation and growth behavior of planar slip alloys, studies have been carried out in strain control on Cu‐16 at.% A1 single crystals oriented for easy glide. Alloy single crystals of Cu‐16 at.% A1 do not show saturation like copper crystals, but harden slowly an…
Abstract The reactions of an epoxy prepolymer based on bisphenol A diglycidylether (DGEBA) with γ‐aminopropyltriethoxysilane (γ‐APS) are studied. The results of different techniques are compared: size exclusion chromatography, differential scanning calorimetry, chemical titration, and Fourier Transform Infrared absorp…