Materials Literature
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Abstract A general procedure is developed for the treatment of the molecular distributions arising from linear polycondensations involving more than one monomer. The distributions actually arising are rather complex, and are usually represented by several series. A method is elucidated by which the number average mole…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrothermal Synthesis of Sapphire1R. A. Laudise and A. A. BallmanCite this: J. Am. Chem. Soc. 1958, 80, 11, 2655–2657Publication Date (Print):June 1, 1958Publication History Published online1 May 2002Published inissue 1 June 1958https://pubs.acs.org/doi/10.1021/ja01544a014h…
The thermal expansion, modulus of rupture, and modulus of elasticity of sintered magnesium dititanate were measured as functions of temperature and thermal history. The values increased with increasing temperature up to 1000°C., and hysteresis effects were found during cooling. Delayed strain effects were observed. Th…
A method is presented for calculating temperature distributions in diathermanous sheets that are being heated or cooled. It differs from previous calculations of this type in that it takes a more comprehensive account of radiative effects that play a part in these processes. Principally, these effects are the penetrat…
The density of electron-spin angular momentum (erg-sec/cm3) at a point x, y, z in a paramagnetic molecule is ℏ Szρ(x, y, z), where Sz is the z component of the total electron spin angular momentum in units of ℏ. If the exact wave function for the molecule Ψ is built up from one-electron basis functions ψi, then the no…
Neutron diffraction measurements on synthetic single crystals of magnetite confirm the orthorhombic ordering scheme proposed by Verwey and co-workers to explain the changes in physical properties which magnetite undergoes when cooled below 119\ifmmode^\circ\else\textdegree\fi{}K. A magnetic field suitably applied duri…
A new phenomenological approach to quantitative discussions of the statistics and time dependence of mechanical breakdown is presented. The theory permits the prediction of relationships between the lifetime distributions to be observed for fibers under different loading histories: dead loads, loads proportional to ti…
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The influence of combinations of various normal mineral components in domestic waters on the rate of corrosion of cast iron and steel and on the development of tuberculation is reported. Tests were conducted with air saturated waters at room temperature with velocities of 0.1-1.0 fps and with pH controlled by carbon d…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPHOTOCHEMICAL REACTIONS OF KETONES IN SOLUTIONN. C. Yang and Ding-Djung H. YangCite this: J. Am. Chem. Soc. 1958, 80, 11, 2913–2914Publication Date (Print):June 1, 1958Publication History Published online1 May 2002Published inissue 1 June 1958https://pubs.acs.org/doi/10.1021…
Because of the importance of mnetalography to the technolagy of titanium and because of the current interest in titanium technology, it is essential that the metallurgists working with titanium understand its metallography. In this report emphasis is placed on the microstructures of titanium and its alloys. The report…
Abstract Langkettige Dithiole unterschiedlicher Kettenlänge mit verschieden substituierten, mittelständigen aromatischen Ringen lassen sich zu makrocyclischen Disulfiden (Ringgliederzahl 18, 20, 24 und 28) mit Ansa‐Struktur dehydrocyclisieren. Alle untersuchten Dithiole geben Einschlußverbindungen mit α‐ bzw. β‐ Cyclo…
Knowledge of the thickness of sections is important for proper interpretation of electron micrographs. Therefore, the thicknesses of sections of n-butyl methacrylate polymer were determined by ellipsometry, and correlated with the color shown in reflected light. The results are: gray, thinner than 60 mmicro; silver, 6…
Abstract The phenomenon of insolubilization of rubber by carbon black has been known for at least twenty-seven years. There have been many attempts during this time to establish a relationship between insolubilization, or bound rubber formation, and reinforcement of rubber by carbon black. It was postulated, as far ba…
Fabrics in use are rarely subjected to extensions in only one direction, though fabric load-extension testing is normally done in this way. A two-dimensional tester has been constructed with which load-extension curves for both weft and warp directions (or any other mutually perpendicular directions) are recorded simu…
F?ur poly~vinyl chloride) polymers l?repared with different initiators were exposed to ultravIOlet radIant energy and to heat, III a vacuum and in air.The gaseous products evo!ved were analyzed by mass spectrometry.Changes in chemical structure were followed by Illfrared spectrophotometry.Benzene was among the product…