Materials Literature
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There has emerged recently a new theoretical picture of the way in which patterns are formed in dendritic crystal growth and in the closely analogous phenomenon of viscous fingering in fluids. Some interesting questions that arise in connection with this theory include: How broad is its range of validity? How do we un…
Basic lead styphnate RD 1349 forms the primary explosive component of several high temperature fuzehead formulations and percussion primers. A study of its thermal decomposition under controlled conditions near its ignition temperature (521–525 K) shows that it decomposes very rapidly, following a second order autocat…
Reaction of 1,3,5-tris(dimethylamino)benzene (TDMAB ) with 1,2,3,4,5,6-hexacyanobenzene (HCNB) in acetonitrile solution gives - depending on the crystallization method - two different products: dark needles of a 1:1 (1) and black compact crystals with a metallic lustre of a 2:1 (2) charge transfer complex. 2 crystalli…
Abstract Novel poly(amide‐sulfonamide)s have been prepared by reacting terephthaloyl, isophthaloyl, and sebacoyl chloride with variously substituted dianilines containing preformed sulfonamide linkages. Inherent viscosities of the prepared polymers ranged from 0.19 to 0.58 dL/g. Despite low apparent viscosities, the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and characterization of syndiotactic poly(vinylcyclohexane)Kazuo Soga, Hisayuki Nakatani, and Takesi ShionoCite this: Macromolecules 1989, 22, 3, 1499–1500Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 Marc…
Irradiation, with ultraviolet light, of 2-phenylbenzotriazole in aerated solvents resulted in oxidation of the benzo ring to yield the diacid 2-phenyl-1,2,3-triazole-4,5-dicarboxylic acid. A possible intermediate, 2-phenylbenzotriazole-4,7-dione, also yielded the diacid on photooxidation . The methyl ether of the comm…
Grain-oriented silicon steels of various thickness were built into 3-phase stacked cores, and the relationship between the building factor (B.F.) and the material loss was discussed. The loss component proportional to square of frequency ( W e ), and the ratio of W e to total loss too, decrease as the thickness of the…
The A2BX4 family of K2SO4-related structures have long been of interest to crystal chemists, largely due to the numerous different polymorphs and complicated sequences of phase transitions they sometimes exhibit as a function of temperature. For most such A2BX4 compounds, there are essentially only two distinct struct…
Complex modulus data is presented for a total of 44 materials. The material types include polymers, enamels, and structural adhesives. The complex modulus data was obtained using the ASTM E-756 standard test. The complex modulus data set for each material given in this report contains the following information: A full…
People are major contributors of particle contamination in cleanrooms and therefore must wear occlusive clothing to reduce their dispersion. Three tests are described which assess the effectiveness of fabrics in filtering body emissions. Also described is a dispersal chamber in which the dispersal rate of a person can…
Abstract The unit cell dimensions of minerals in the smectite group, regular and random mixed-layer groups, and halloysite shown in the Mineral Powder Diffraction File (1986) have been refined by least-squares analysis in the hexagonal system with a primitive lattice with indices restricted to hk or 00 l reflections.…
The high-field dielectric dissipation factor (tan δ) of low-density polyethylene (LDPE) films was studied as a function of the applied ac field and the voltage application period. The measurements were made at room temperature by means of a current comparator-type capacitance bridge. As the applied ac field increased,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe influence of surfactants on the crystallization of L-isoleucineRonald C. Zumstein and Ronald W. RousseauCite this: Ind. Eng. Chem. Res. 1989, 28, 3, 334–340Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989h…
Abstract μ-Carbonato-bridged binuclear nickel(II) complexes with N,N′,N″,N″″-tetrakis(2-aminoethyl)-1,4,8,11-tetraazacyclotetradecane(taec), [Ni2(taec)(CO3)](ClO4)2·H2O has been prepared and characterized by electronic spectra, magnetic susceptibilities (80–300 K), and X-ray structure analysis.
Using a M\"ossbauer source technique we have been able to make the first direct determination of the distribution of Co in ${\mathrm{Nd}}_{2}$${\mathrm{Fe}}_{14}$B at very low concentration. Co avoids the ${j}_{2}$ site, but occupies the remaining five at random.
Al, Fe and Mn in two mineral soils were extracted by 0.05 M and 0.02 M oxalate and pyrophosphate and 0.02 M EDTA solutions the pH of which was adjusted to values ranging from 1.7 to 11.0. The extractability of metals tended to decrease as the pH rose and as the deprotonation of extractant acid, expressed as pKa values…
The crevice corrosion behavior of 22% Cr duplex stainless steel (SS), which has become widely used because of its high strength and stress corrosion cracking (SCC) resistance, was investigated in simulated sour gas conditions. The crevice corrosion is accelerated with increasing partial pressure of H2S and temperature…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry and radiation chemistry of semiconductor colloids. 27. Preparation of colloidal lead dioxide and various electron-transfer processesAnil Kumar, Arnim Henglein, and Horst WellerCite this: J. Phys. Chem. 1989, 93, 6, 2262–2266Publication Date (Print):March 1, 19…
This report summarizes work conducted on the split-Hopkinson pressure bar (SHPB). The SHPB was modified to permit both tensile and compressive testing on cementitious materials. Direct tension tests were performed on concrete by cementing the specimen to the SHPB. Splitting cylinder tests were also conducted in the SH…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn oxygen-centered tetranuclear titanium compound Ti4O(S2)4Cl6F. Albert Cotton, Xuejun Feng, Piotr A. Kibala, and Robert B. W. SandorCite this: J. Am. Chem. Soc. 1989, 111, 6, 2148–2151Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Publis…