Materials Literature
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The influence of sulfur in the range 80 to 1700 ppm on the corrosion resistance of a 14 wt % Cr-14 wt % Ni-balance Fe alloy has been determined in various media. In general, high purity alloys containing sulfur are shown to have excellent general corrosion resistance to oxidizing and nonoxidizing acids when compared w…
Abstract Soil clays containing pedogenically chloritized 2:1 layer silicates, after brief contact at 25C with 2% Na 2 CO 3 (pH 11), developed a proportionately large increment of CEC which was retained after thorough washing with neutral salts (KCl, NaCl) to reduce the pH value below 7. A soil clay from Natal, S. Afri…
The heat-transport properties and heat capacity of UC, UP, and US were determined between room temperature and 600°C. These properties were measured by a transient technique with a laser as a heat pulse source. The thermal conductivity was calculated from the product of the thermal diffusivity, heat capacity, and dens…
Abstract Nuclear magnetic resonance, infrared, and ultraviolet spectroscopy were used to elucidate the structure of oxidized polystyrene. To identify the nuclear magnetic resonance peaks of the degraded polystyrene, deuterated polystyrenes were synthesized and degraded. The primary structure present in the degraded po…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEstimation of preexponential factor from thermal decomposition curve of an unweighed sampleRaymond N. Rogers and Louis Charles. SmithCite this: Anal. Chem. 1967, 39, 8, 1024–1025Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inis…
Experimentally determined heat capacity valu es, precise to within 0.1 percent, and related thermal data are reported for quenched and annealed diethyl phthalate glasses from ]0 oK to the glass transformation te mperature, Tg (around 180 O K) , for the liquid from T" to 360 oK, and for the crystal from 10 oK to the me…
A technique for the examination of the dynamic-tensile-strength characteristics of materials is presented. The dependence of tensile strength upon stress gradient, hence stress rate, is demonstrated for Al, Cu, Ni, and Pb. The results were tested and found to be self-consistent in that once the dynamic-tensile-strengt…
Transparent glass‐ceramics, in which the major phase was NaNbO 3 , were obtained by heat treatment of glasses in the Na 2 O‐Nb 2 O 5 ‐SiO 2 system. The structure of the glass and the changes occurring during crystallization as a function of temperature and heating rate were examined by X‐ray diffraction, transmission…
The climb kinetics of dislocation loops in thin foils in terms of either the emission of vacancies from the loop or the diffusion of vacancies to the surface has been critically examined. Although both mechanisms give similar rate equations, predictions can be made which allow the rate controlling process to be determ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophobic hypercoiling in copolymers of maleic acid and alkyl vinyl ethersPaul Dubin and Ulrich P. StraussCite this: J. Phys. Chem. 1967, 71, 8, 2757–2759Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Published inissue 1 July 1967https:/…
Abstract By the use of simple models of filled plastics, approximate equations are derived for elongation to break in the case of perfect adhesion between the phases and for the tensile strength in the case of no adhesion between the polymer and filler phases. By combining these equations with equations for the modulu…
Abstract Using the adiabatic calorimeter which has been developed by Nagasaki & Takagi (1948) and manufactured by the Rigaku Denki Company, the energy changes associated with the dehydration and dehydroxylation processes of clay minerals were measured at room pressure. The samples studied were mont-morillonite, ch…
The effect of relative humidity on the tare weight of glass-fiber filters was insignificant, but the effect on collected particulates was significant when the humidity exceeded 55%. When particulate samples were weighed at relative humidities below 55%, weight variations did not exceed 1%.
The crystal structure of a new copper zine arsenosulfosalt, Cu 6 Zn 3 As 4 S 12 has been determined. Tho crystal is rhombohedral, having tho unit-cell dimensions a rh = 8.34 Å, α rh = 107°20′, a hex = 13.44 Å, c hex = 9.17 Å, and the symmetry C 3 4 – R 3. The structure was solved by interpretation of a three-dimension…
Abstract 1-Phthalimido-1,3-butadiene (I) and 2-phthalimido-1,3-butadiene (II) were chosen for study as typical imidobutadienes in order to clarify the role of such imido groups in determining the orientation of the addition reactions, and also the addition modes in their own polymerizations. The addition reactions of…
The vaporization rate of solid SiO was studied in the temperature range 1005° to 1475°C. It was concluded that ( a ) in an argon atmosphere the vaporization rate is external gas diffusion controlled; ( b ) only the upper layers of the charge contribute to the vaporization, so that a zero‐order process is observed; ( c…
Abstract The carbonatation of calcium hydroxide has been re‐investigated using thermal and X ‐ray diffraction methods of analysis. The crystal size and morphology of Ca(OH) 2 vary with the method of preparation, which also affects the rate and mechanism of the carbonatation reaction. This is also dependent upon the re…
Abstract It is possible to identify three distinct types of polymer adhesion on the basis of the physical state of adhesive and adherend: ( 1 ) rubbery polymer–rubbery polymer (R–R adhesion); ( 2 ) rubbery polymer–glassy polymer (R–G adhesion); ( 3 ) rubbery polymer–nonpolymer (R–S adhesion). Limitations of the diffus…
The thermal diffusivity of five platinum samples with resistivity ratios of 12, 34, 100, 900, and 5000 has been measured from 300° to 1200°K. Only the sample with the resistivity ratio of 12 showed deviations of more than 3% from the average thermal diffusivity of the two purest samples. Thermal conductivity values ha…
Abstract The α, β, and γ transitions at temperatures between −200 and +100°C. of crosslinked aromatic and aliphatic epoxy polymers were determined from damping and shear modulus data, and compared with their fluorine containing analogs. Loci of segmental relaxation are suggested at various temperatures, and similariti…