Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAir temperature and humidity profiles in spray drying. 2. Experimental measurementsSpyridon E. Papadakis and C. Judson KingCite this: Ind. Eng. Chem. Res. 1988, 27, 11, 2116–2123Publication Date (Print):November 1, 1988Publication History Published online1 May 2002Published…
Abstract Polycaprolactone (PCL) crosslinked below the gel point either with peroxide or by exposure to ionizing radiation was compared by Theological studies. As a result of peroxide crosslinking, PCL increases in viscosity and shear rate dependence and exhibits increased dynamic moduli that converge at higher frequen…
For different compositions of the system Bi x Ge 20 Se 80- x with 5 ⩽ x ⩽ 40 at.% metallic and both gapless and normal semiconductor-conduction behaviours could be shown depending on x and conditions of treatment. The calculated activation energy seemed relatively small and decreased with more enriching with Bi. The o…
Abstract The direct polycondensation of terephthalic acid and p ‐phenylenediamine hydrochloride (PPD.2HCl) with thionyl chloride was found to be significantly promoted in N ‐methylpyrrolidone (NMP) by dissolved CaCl 2 and tertiary amines. The inherent viscosity of the polymer obtained varied with the amount of CaCl 2…
Material functions of two engineering plastics [a poly(phenylene ether) and a polycether imide)] were characterized, including the shear viscosity, first normal stress coeffkient, storage and loss moduli, growth and relaxation of shear stress, and first normal stress coeffkient and relaxation moduli. The oscillatory s…
Abstract The crystal structure of iodine/trans‐polyacetylene complexes (CHI y ) x ( y = 0,009, 0,035, 0,17 and 0,30) was investigated by X‐ray diffraction analysis of highly oriented samples. An iodine‐containing phase (PAI) was observed in all cases, accompanied by residual crystallinity due to pristine polyacetylene…
The densities of seven rare‐earth sesquioxides and yttrium sesquioxide were measured in the liquid state in the temperature range from melting point to ∼3200 K. An aerodynamic levitation technique and laser‐heating method were used. The variation of volume at fusion for these oxides was deduced from these results and…
S 2-alkoxyfluorene-7-carboxylic acid 4-(2-methylbutoxy)-phenyl ester and S 2-alkoxyfluorenone-7-carboxylic acid 4-(2-methylbutoxy)-phenyl ester were synthesized and the effects of mesogen modification or substitution of biphenyl with fluorene and fluorenone group in a mesogen core were studied to obtain a wide tempera…
A 2.25Cr - 1Mo - 0.1C welded steel having a microstructure described as "granular bainite" has been investigated using optical microscopy, electron microscopy and atom probe field ion microscopy. Granular bainite was found to consist of bainitic ferrite and retained austenite, but no cementite. Grains of ferrite are b…
A new series of cyano-substituted mesomorphic side chain polyacrylates has been synthesized. Optical observations, D.S.C. studies and X-ray diffraction on oriented samples show that all polymers possess a partially bilayer Sa d phase. The smectic period has been measured from which it is inferred that the molecular st…
Modified Strontium Barium Niobate (SBLLN) ceramics were prepared by the conventional oxide technique. The permittivities of thermally depoled SBLLN ceramics measured at 100 kHz are much smaller than that of intrinsic Sr0.75Ba0.25Nb2O6 crystal. The EP hysteresis loops of the materials are of the slim-loop type. Ceramic…
Abstract The rate of reaction between NO and HNO 3 and the rate of thermal decomposition of HNO 3 have been measured by FTIR spectroscopy. The measurements were made in a teflon lined batch reactor having a surface to volume ratio of 14 m −1 . During the experiments, with initial HNO 3 concentrations between 2 and 12…
Abstract A variety of β-perfluoroalkylpyrroles were prepared from reaction of β-perfluoroalkyl-α,β-unsaturated ketones with p-toluenesulfonylmethylisocyanide in moderate yields. Tetrakis(perfluoroalkyl)porphyrins were readily obtained by oxidative cyclization of 2-hydroxymethyl-3-ethyl-4-perfluoroalkylpyrroles in acid…
The relaxation of the soft mode is observed both in the Sm A and Sm C * phases by eliminating the contribution of the Goldstone mode under a dc bias field. Three relaxations are observed in the Sm C * phase at the frequency range below 10 MHz. The temperature dependence of the dielectric constant originating in the so…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluorescent lanthanide complexes. 1. Reaction between terbium(3+) and 4-oxo-4H-1-benzopyran-3-carboxaldehyde in alcoholic mediumCarla Bisi Castellani, Oliviero Carugo, Carlo Tomba, and Anna Invernizzi GambaCite this: Inorg. Chem. 1988, 27, 22, 3965–3968Publication Date (Prin…
NiSO 4 .6H 2 O cristallise dans C 2 /c avec affinement jusqu'a 0,031 ou P4 1 2 1 2 avec affinement jusqu'a 0,045
The partial structure factors and radial distribution functions for liquid CuSe have been determined by the isotopic substitution technique and the results compared with those from an earlier study of liquid CuTe. It is shown that, whereas the underlying ionic configuration of CuTe can be written as Cu+Te−, for CuSe t…
The specific liquid permeabilities of a wide variety of phosphatebonded, porous alumina compacts prepared from alumina powders of differing size distribution, and ranging in porosity from 32 to 50 vol%, were not described well by the Carmen‐Kozeny model but were described by a capillary model based on mean entry pore…
Abstract A unified numerical method to integrate stiff time‐dependent constitutive equations has been developed. This method is a stable, non‐iterative and self‐correcting solution procedure which works successfully over a wide range in strain rate sensitivity. Time steps are automatically controlled during integratio…
The optical detection of the surface coupling of nematic liquid crystals (NLCs) with rubbed polyimide substrates subjected to pure twist is described. Transmitted light beams through a cell comprised of homogeneously aligned NLC of a cyanobiphenyl, 5CB, inserted between crossed polarizers are observed as functions of…