Materials Literature
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Abstract : Sections of CDA 706 piping and Monel 400 tubing were severely pitted after exposure to marine and estuarine waters, respectively. Surfaces of both alloys were uniformly covered with thick surface deposits, ranging in color form blue-green to reddish brown to black. Pits developed under surface deposits cont…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochromic molybdenum trioxide thin film preparation and characterizationDaniel Belanger and Guylaine LaperriereCite this: Chem. Mater. 1990, 2, 5, 484–486Publication Date (Print):September 1, 1990Publication History Published online1 May 2002Published inissue 1 Septembe…
The photoluminescence decay of the CaS:Mn 2+ phosphor activated with a fairly large amount of Mn 2+ (1-2mol%) consists of slow (8.5 ms at 80 K) and fast (550 µs at 80 K) exponential decay components due to the single and paired Mn 2+ centers, respectively. From the measurements of time-resolved emission spectra, the e…
Abstract The hemithioindigo derivatives have been found to show satisfactory photoresponses even after more than 104 cycles of alternate irradiation with the lights which can induce a Z–E isomerization.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, electrochemistry, and kinetic investigations of low-spin ferrous bis(difluoroboryl)bis(dioximate) complexesDavid W. Thompson and Dennis V. StynesCite this: Inorg. Chem. 1990, 29, 19, 3815–3822Publication Date (Print):September 1, 1990Publication History Published…
Abstract Bis(trimethylsilyl)bisphenol‐A was condensed with 4,4′‐dichlorodiphenyl sulfone under various reaction conditions. Satisfactory yields and molecular weights of the resulting poly(ethersulfone)s were only obtained when the condensation was conducted in amide solvents (e. g., N ‐methyl‐2‐pyrrolidone) in the pre…
The fusion reactor represents the most difficult challenge of any energy system from the viewpoint of developing materials which will allow fusion to be realized as an economic, safe and environmentally acceptable energy source. Substantial progress has been made over the past decade towards an understanding of the ef…
The electro-optic performance characteristics of PDLC films using two different polymers, namely, poly (methyl methacrylate) (PMMA) and poly (vinyl chloride:vinyl acetate 17%) (PVC:VAC-17) and liquid crystal mixture E-8 (BDH, England) have been studied. It is found that the PMMA-based PDLC films have more superior mec…
Sixteen azobenzene derivatives were used as guests in an ester-type host liquid crystal (LC), 4-hexy- loxyphenyl-4′-ethyl-cyclohexanecarboxylate (ECH 206), and were examined on their ability to induce the photochemical isothermal phase transition of the guest/host mixtures. Attention was focused on the effect of the m…
Abstract The impact behavior of nylon 6‐ rubber blends is studied by varying the rubber concentration (0–26 vol. %), rubber particle size (0.1 ‐ 2.0 μm) and rubber properties. The brittle to tough transition shifts to lower temperatures by increasing the rubber concentration, decreasing the particle size and by loweri…
Abstract Depth profiles calculated using simple peak‐to‐peak or peak height or area measurements are subject to inaccuracies caused by spectral noise, sloping backgrounds and possibly by overlapping spectra of different elements or chemical species. An automated program that reduces or eliminates the effects of these…
Dechlorination of chloroform in water with ultrasound in combination with hydrogen peroxide has been studied. It is believed that the decomposition of chloroform is accomplished by free radical reaction. The experimental results indicate that the optimal hydrogen peroxide concentration has a molar ratio of H2O2:CHCl3…
A thermoviscoplastic computational method for hypersonic structures is presented. The method employs unified viscoplastic constitutive model implemented in a finite element approach for quasi-static thermal-structural analysis. Applications of the approach to convectively cooled hypersonic structures illustrate the ef…
The effect of polymer additive on the growth and collapse of a spherical vapour bubble is investigated theoretically, under conditions appropriate for cavitation (negligible influence of heat transfer, Newtonian viscosity, etc.). The polymer-induced stress is calculated using the yo-yo model of the polymer dynamics in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase structures of dimethylboron azide and dimethylboron isocyanate. Electron diffraction and ab initio studyRenee Hausser-Wallis, Heinz Oberhammer, Wolfgang Einholz, and Peter O. PaetzoldCite this: Inorg. Chem. 1990, 29, 18, 3286–3289Publication Date (Print):September…
Abstract Correlation between state of dispersion and mechanical properties is obtained and failure mechanisms from falling weight impact tests are discussed. The state of dispersion is characterized for calcium carbonate filled polypropylene model composites by using a scanning electron microscope. A dispersion index…
Abstract The key to preparation of commercially useful blends based on immiscible polymer pairs is compatibilization. Advances over the past ten years have considerably enhanced the understanding of this phenomenon. The selection of an appropriate compatibilizer and the processing technique to enhance the compatibiliz…
Perfluorooctylbromide (PFOB: C8F17Br) has been shown to be an effective ultrasound contrast agent when incorporated in tissues. The authors have recently demonstrated that PFOB also enhances tissues and Doppler signals during its capillary phase. To help elucidate the physical basis of their observations, the authors…
Abstract As part of a broader research effort to prepare polyolefin blends with controlled rheological and mechanical behavior, LDPE/PP blends were peroxide modified through reactive processing in intensive batch mixers. Polymers with similar initial viscosities and elasticities were first melt mixed and then simultan…
Abstract Spherulite growth rates in thin films of isotactic polypropylene, poly (methylene oxide), and poly (ethylene adipate) have been studied by light microscopy. The growth rate of the parts of spherulites formed from pockets of occluded melt is decreased drastically. The decrease is associated with the negative p…