Materials Literature
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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…
Abstract The OH-OD exchange of kaolin minerals through contact with D 2 O introduced into interlayer space via intersalation resulted in a partial shift of the OH absorption bands. The total decrease in OH absorbance upon deuteralion was 52, 56, and 47% for the kaolinite, dickite-nacrite, and halloysite respectively,…
The emission lifetimes of matrix-stabilized dimers of anthracene and its derivatives were observed. The two principal conformations considered were the sandwich excimers and the 55° dimers. The excimer lifetimes may be of use in establishing wavefunctions for these transient states. A comparison of the lifetimes and e…
Abstract Furan, pyrrole, and thiophene were polymerized under catalysis by trichloro‐ and trifluoroacetic acid to produce colored polymers which were characterized by various methods, including electronic and proton magnetic resonance spectra and electrical conductances of deeply colored trichloroacetic acid adducts.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational aspects of polypeptide structure. XXIII. Photoisomerization of azoaromatic polypeptidesMurray. Goodman and Martin L. FalxaCite this: J. Am. Chem. Soc. 1967, 89, 15, 3863–3867Publication Date (Print):July 1, 1967Publication History Published online1 May 2002Pub…
Dense lithium ferrite ceramic bodies prepared by hot‐pressing exhibited rectangular hysteresis loops. A number of physical properties of technical interest were evaluated and results given. These include initial permeability, dc resistivity, resonance Une width, g eff factor, and saturation magnetization. The effect o…
Perhaps the best theoretical approximation to the experimentally observed attenuation and spreading of seismic body waves is due to Futterman. Wuenschel has utilized the Pierre shale field data of McDonal et al. as well as his own two-dimensional model work using plexiglas sheet, to obtain remarkable confirmation of F…
Pyrocatechasewas purified from extracts of benzoateinduced cells of Pseudomonas arvilta.The most purified preparation had a specific activity of 29.6, about 50% higher than that previously reported, and was homogeneous as judged by ultracentrifugation and by electrophoresis.The molecular weight was estimated to be app…
An experimental technique has been developed for the absolute measurement of the density of a surface charge on a dielectric. The apparatus is described and includes provision for producing the surface charges by electron and ultra-violet irradiation, and by the contact of metal electrodes of known differences in work…