Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel two-step synthesis of poly(benzothiazoles) via new precursor polyamides from 2,5-bis[(cyanoethyl)thio]-1,4-phenylenediamine and aromatic dicarboxylic acid chloridesTatsuya Hattori, Kazuhiro Kagawa, Masaaki Kakimoto, and Yoshio ImaiCite this: Macromolecules 1993, 26, 16…
Coatings of carbon-boron-nitrogen compounds with various compositions are obtained in a low pressure chemical vapour deposition process using acetylene, boron trichloride, ammonia and hydrogen as input gases. Compositions are located in the ternary system C-BN-"BC3". The structure of the films is a graphitic turbostra…
An expanding spherical gas bubble moves in an incompressible, viscous fluid under gravity. The nonlinear equations of motion are solved numerically. The growth of the radius of the bubble, the velocity of its center, and the drag experienced by the bubble are obtained with the progress of time. The gravity is found to…
For many years the thickener [1, 2] requirements of textile printers have been met by naturally occurring gums such as guar, alginate, locust bean, starch, and cellulose derivatives [3]. These thickeners require very long hydration times [4], have poor thermal stability, and a low degree of purity. They have therefore…
Abstract Redetermination of the crystal structure of poly( p ‐benzamide) was made by using newly collected intensity data. The molecular conformation is TCTC, where the internal rotation angles about the NC bond of the amide group and about the virtual bond of N ‐phenyl‐ C are T (trans) and C (cis) conformations, res…
A study is presented of the properties of luminescent ceramics which are roughly based on rare-earth doped oxides, oxysulfides, garnets, and silicates. Exemplary luminescent ceramic specimens are prepared on the basis of (Y,Gd)/sub 2/O/sub 3/:Eu, Gd/sub 2/O/sub 2/S:Pr,Ce, Gd/sub 3/Ga/sub 5/O/sub 12/:Cr,Ce, and Y/sub 2…
The dynamics of an underwater explosion bubble, including its collapse and interaction with a free or hard surface, are analyzed using incompressible flow theory and a boundary integral formulation. The formulation of the solution method and the crux of the numerical treatment are presented in detail. A computer progr…
The binary isopleth Na 2 O.B 2 O 3 ‐SiO 2 of the Na 2 O‐B 2 O 3 SiO 2 ternary system has been investigated. A phase diagram is presented based upon data from differential thermal analysis studies of prepared glasses and direct observation of the melting behavior using solid‐state video imaging. Phase equilibria relati…
Abstract The melting behavior of drawn, compression‐molded isotactic polypropylene has been ex‐amined in terms of the infuence of drawing conditions on the observed properties. Two endothermic peaks were observed on differential scanning calorimetry (DSC) for samples when high draw ratios and high heating rates were u…
Abstract The two series of compounds, Li x NbO 2 and Na x NbO 2 , were synthesized from LiNbO 2 and NaNbO 2 with oxidizing agents. From neutron diffraction, it is concluded that the Li position is fully occupied for x = 1. Even though the long‐range crystal symmetry does not seem to change for x < 1, as monitored b…
Synopsis Morphology and coefficient of friction associated with water content in the skin were investigated by a combination method of profilometry and measurement of friction using a newly developed instrument placed on the flexor aspect of the forearm. It was shown that the number of domains enclosed by lines (sulci…
We model dilute lyotropic smectics as a periodic stack of compressible-fluid membranes with width w separated by an incompressible background fluid of thickness d - w . We calculate the dynamical modes for this model as a function of the wave number q . For qd ≪ 1, we find precisely the hydrodynamic modes of a two-com…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEnhanced rate of redox conversion of polyaniline films induced by the incorporation of platinum microparticlesR. Kostecki, M. Ulmann, J. Augustynski, D. J. Strike, and M. Koudelka-HepCite this: J. Phys. Chem. 1993, 97, 31, 8113–8115Publication Date (Print):August 1, 1993Publ…
Al-(0.7-1.4 wt%) Cu alloy films for LSI interconnects were formed, for the first time, by a metalorganic chemical vapor deposition method, using dimethylaluminumhydride ((CH 3 ) 2 AlH) and cyclopentadienylcoppertriethylphosphine ((C 5 H 5 )CuP(C 2 H 5 ) 3 ) as precursors. The depth profile of Auger electron spectrosco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPersistence length of the "rodlike" molecule poly(p-phenylene-trans-benzobisthiazole) revisitedDaniel B. Roitman and Mark McAdonCite this: Macromolecules 1993, 26, 16, 4381–4383Publication Date (Print):August 1, 1993Publication History Published online1 May 2002Published ini…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTWater-induced crystalline transition of polyamide 66: a combined x-ray and molecular modeling approachC. Vergelati, A. Imberty, and S. PerezCite this: Macromolecules 1993, 26, 17, 4420–4425Publication Date (Print):August 1, 1993Publication History Published online1 May 2002P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTwo New Prieurianin-Class Limonoids from Turraea mombasanaGeoffrey O. Adul, Michael D. Bentley, Barrett W. Benson, Fu-Yung Huang, Leslie Gelbaum, and Ahmed HassanaliCite this: J. Nat. Prod. 1993, 56, 8, 1414–1417Publication Date (Print):August 1, 1993Publication History Publ…
In order to realize organic ferrimagnets, we have prepared stable organic radicals, mono-, di-, trinitronyl nitroxides (1∼3) with different spin multiplicities. Among them, intramolecular ferromagnetic couplings in tri- and diradicals (3 and 2a), which are hidden by antiferromagnetic intermolecular interaction in the…
Stress corrosion cracking (SCC) of AISI 321 (UNS S32100) stainless steel (SS) in 0.5 mol/L sodium chloride (NaCl) +0.5 mol/L hydrochloric acid (HCl) solution and the inhibition effects of some iodides and iodine (I2) were studied using the slow strain rate technique. Iodides studied were tetramethyl ammonium iodide (T…
Abstract The dc electrical conductivity of TlInX 2 (X = Se, Te) single crystals, parallel and perpendicular to the (001) c ‐axis is studied under high quasi‐hydrostatic pressure up to 7.0 GPa, at room temperature. Conductivity measurements parallel to the c ‐axis are carried out at high pressures and down to liquid ni…