Materials Literature
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The new compounds Cr(3)Si(2)O(7).(1)/(4)MX (MX = NaCl, NaBr, KCl, KBr) form a series of chromous disilicates hosting alkali-metal halides in a framework structure. Purple crystals with edge lengths up to 1 mm were prepared by reacting mixtures of Cr(2)O(3), Cr, SiO(2), and the respective alkali-metal halide in evacuat…
We report rotation of a single director in a nematic monodomain, acrylate based side-chain elastomer which was subjected to mechanical fields applied at angles in the range to the director, , present at the time of network formation. Time and spatially resolving wide angle X-ray scattering, together with polarised lig…
Abstract Well-formed crystals of chlorapatite [Ca5Cl(PO4)3] were first grown from a sodium chloride flux. The solubility of Ca5Cl(PO4)3 in NaCl increased with increasing temperature. At 1100 °C, Ca5Cl(PO4)3 had a solubility of about 0.15 mol%. The crystal growth of Ca5Cl(PO4)3 was conducted by heating a mixture of sol…
In this paper we present a 1-D model for the behavior of U-Nb shape memory alloys that accounts for the effect of plastic deformations on recovery strains. In particular, we account for the erasure of memory effect that occurs with increasing plastic strains. An algorithmic approximation to the model is discussed in d…
The properties of a series of stable diradicals based either on iminonitroxide (IN) or nitronylnitroxide (NN) are described. Both radical fragments are coupled by various phenylene and phenylethynylene (triple bond) bridges. They are characterized by EPR studies both in solution and in glassy state. Magnetic coupling…
Poly( S -thioester)s were successfully synthesized by a new addition reaction of bis(thiirane)s with diacyl chlorides catalyzed by quaternary onium salts or crown ether complexes. The polyaddition of Bisphenol A bis(2,3-epithiopropyl) ether (BPTE) or butanediol bis(2,3-epithiopropyl) ether with certain diacyl chloride…
Thermoplastic elastomers offer many interesting properties. This paper introduces the material class of TPE and describes their application in breathable laminates for garment improvement, especially protection garments. The most important production and manufacturing processes will be discussed and the relevant prope…
An ionic charge transfer complex of dimethylamino nitronyl nitroxide (DMANN) was prepared by grinding with DDQ in the solid state. An electronic spectrum of the complex showed a broad band at 0.65 eV. The conductivity of the complex was σ ∼ 10−6 S-cm−1 at room temperature. The measurement of the magnetic susceptibilit…
The major objective of the present work is to design a high speed steel composition for tool casting. The effect of replacement of V and W by Nb as a modifier of the structure and properties of cast S 2-9-2 (AISI M7) high speed steel has been investigated with the aid of EDX and WDX attached to the scaning electron mi…
Fourier transform infrared (FT-IR) spectroscopy was used to study the photopolymerization of 4,4'-bis(acryloyl)biphenyl (BAB), dispersed in the liquid crystal (E7). The infrared absorbance of the carbon–carbon double bond of the acrylate group was monitored to follow the course of the polymerization and to determine t…
Several [5]helicene-containing polyimides have been synthesized by chemical and thermal transformation of the precursor polyimides having the tetrahydro[5]helicene unit. The illustrated diamines 4a and 4b were polymerized with two dianhydrides (6FDA and s-BPDA) to form high molecular weight polyimides 5a,b and 6a,b, c…
Abstract A series of 2,3‐ O ‐carboxymethylcelluloses (CMC's), which are regioselectively substituted at the C‐2 and C‐3 position, were prepared and their water solubility was examined. It was found that the lower limit for the degree of substitution (DS) value of water‐soluble 2,3‐ O ‐CMC is about 0.3. This value was…
Several recent experiments on glycerol and other supercooled liquids have suggested that dynamically heterogeneous domains in the liquid are responsible for the nonexponential structural relaxation dynamics observed near the glass transition. In addition, it appears that the exchange of domain types may occur much mor…
The a.c. electrical properties of graphitized carbon-black filled rubbers were investigated in the temperature range 25–85°C and in the frequency range 10–106 Hz. The volume fraction of the filler varied from 15 to 60%. The a.c. impedance was found to decrease dramatically with increasing filler content for volume fra…
We report crystal magnetic susceptibility results of two $S=1/2$ one-dimensional Heisenberg antiferromagnets, ${\mathrm{KFeS}}_{2}$ and ${\mathrm{CsFeS}}_{2}.$ Both compounds consist of $({\mathrm{FeS}}_{4}{)}_{n}$ chains with an average Fe-Fe distance of 2.7 \AA{}. In ${\mathrm{KFeS}}_{2},$ all intrachain Fe-Fe dista…
In 1994 EMPA published an extensive study on 36 rain jackets (ARES project [5]). Testing and evaluation have been concentrated on the points of emphasis physiology and weather protection. The study has been positively recognised internationally. Encouraged by this positive response EMPA decided to carry out a new inve…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSingle-Crystal Matrix Isolation of BiopolymersJean Chmielewski, Jerry J. Lewis, Scott Lovell, Reena Zutshi, Phil Savickas, Christine A. Mitchell, J. Anand Subramony, and Bart KahrView Author Information Department of Chemistry, Purdue University West Lafayette, Indiana…
Chemical composition of the aqueous solution within crevices on two different Ni-Cr-Mo-Fe alloys immersed in natural seawater was determined using a semiquantitative thin-layer chromatographic method. Active crevices were found to contain concentrated amounts of dissolved Ni2+, Cr3+, Mo3+, and Fe2+ ions. Propagation o…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTA High-Resolution Calorimetry Study of the Order−Disorder Transition in a Diblock Copolymer MeltV. P. Voronov, V. M. Buleiko, V. E. Podneks, I. W. Hamley, J. P. A. Fairclough, A. J. Ryan, S.-M. Mai, B.-X. Liao, and C. BoothView Author Information Oil and Gas Research Institute…
Changes in the active site of fumarase (yeast fumarase II) that occur when fumarate is converted to malate (E.F --> E.M) must be reversed for another cycle of reaction to take place. As shown here, recycling of the enzyme includes two proton transfers and one conformational change. These events, together with the M-of…