Materials Literature
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Abstract Contrary to the aliphatic polyanhydrides prepared by Carothers, polyanhydrides containing aromatic nuclei in the main chain possess high melting points and good hydrolytic stability. A number of different aromatic polyanhydrides were prepared. Their preparation and properties, such as fiber‐forming properties…
A model of cleavage applicable to metals cleaving on the slip plane is developed in which a crack is initiated at the end of a low angle tilt boundary terminating inside the crystal. The strength of the metal is determined by the difficulty of growth of the crack. Satisfactory agreement is obtained with the experiment…
Abstract 1) The infrared spectra of the lower members of methoxy-, methylmethoxy and methoxy endblocked dimethyl-polysiloxanes have been discussed by comparing them with that of dimethylether, dimethylpolysiloxanes, and so on. 2) The characteristic absorption band of Si—OCH3 group has appeared near 1190 cm−1. 3) Excep…
Abstract The action of ionizing radiations on polymers leads, in general, to degradation and, in certain cases, to some further polymerization (crosslinking). It is known, on general physical grounds, that the energy of the radiation is converted into ionization and excitation of the molecules present in the system. T…
Abstract The twist due to a screw dislocation parallel to the axis of an isotropic cylinder of arbitrary cross section can be found from the solution of the ordinary torsion problem for the same cylinder. Some particular cases are worked out. The results are also valid for certain kinds of anisotropy.
An equal ratio-arm, capacitance-con ductance bridge operated at frcq ue ncie below 100 kilocycles per sccond was used to meas ure t he dielec tric constant of de uterium ox ide wi Lh an accuracy of 0.1 percent or better in t he range 4 to 100 C. A val ue of 77 .9-l was found for the dielectric cons tant a t 25 C. The…
The elastic constants of strontium titanate (SrTi${\mathrm{O}}_{3}$) were measured by the compound resonator method. Oriented quartz cylinders were used as drivers to excite the sample cylinders. The measured values for the compliance constants are ${s}_{1111}=3.3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFurther Studies of Adsorption on Graphitized Carbon BlacksW. B. Spencer, C. H. Amberg, and R. A. BeebeCite this: J. Phys. Chem. 1958, 62, 6, 719–723Publication Date (Print):June 1, 1958Publication History Published online1 May 2002Published inissue 1 June 1958https://pubs.ac…
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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