Materials Literature
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Abstract In the previous one-dimensional dislocation model, a single sinusoidal term was taken to represent the potential energy of the deposit as a function of its position on the substrate. In this model a more general representation of the potential, containing a second harmonic term as well, is used, and it is sho…
Abstract The polymerization of carbonic anhydrides, a reaction important but>u as a preparative method for the synthesis of polypeptides and as an example of a less familiar type of polymerization, has been studied in detail using sarcosine carbonic anhydride (I). The propagation reaction has been shown to invo…
4) Evidence on the cleavage patterns seems to prove that this optical effect is directly related to a physically lamellar structure.
It is well known that voltage transformers of the usual electromagnetic type constitute a very costly item in high-voltage systems. Considerable savings could be effected by the use of voltage transformers of the capacitor type if their design could be perfected to give sufficient accuracy, i.e. if their ratio errors…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonation of Aqueous Suspensions Containing Magnesium Oxides or HydroxidesRobert L. Evans and Hillary W. St. ClairCite this: Ind. Eng. Chem. 1949, 41, 12, 2814–2817Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 De…
Abstract In connection with the rubber crisis of the war, useful fundamental controls and improvements of quality of synthetic rubber which would fit in with current engineering were urgently needed. Variations in the solubility of butadiene polymers and copolymers had been noted by many rubber researchers seemingly t…
Abstract The paper deals with a tentative plan to extend quantitative x‐ray measurements for determining the degree of crystallinity of polymers (as used earlier in cellulose determinations), to the investigation of rubber, polythene, and a polyamide. Strictly monochromatized copper radiation was used. The results sho…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRapid Measurement of Cellulose Viscosity by Nitration MethodsW. J. Alexander and R. L. MitchellCite this: Anal. Chem. 1949, 21, 12, 1497–1500Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Initiation in Styrene Emulsion PolymerizationWendell V. SmithCite this: J. Am. Chem. Soc. 1949, 71, 12, 4077–4082Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.acs.org/doi/10.1021/ja0…
The failure of certain LCAO molecular orbital calculations of the spectrum of porphine is attributed to the incorrect assumption of complete ``aromaticity.'' A division of the π-electron system into non-interacting parts is supported by the fact that the dynamical properties of the divided system, as calculated by the…
A concrete containing only magnetite ore concentrate, cement, and water is found to have appreciably better shielding properties than ordinary concrete, and to possess good strength and ease of handling. Exceptionally high moisture content, although gradually lost by diffusion, decreases by only about 50 percent in th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComposition of Two Types of Cellulose PhosphatesJ. David Reid, Laurence W. Mazzeno, and Edmund M. BurasCite this: Ind. Eng. Chem. 1949, 41, 12, 2831–2834Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949ht…
The resistivity and the total emissivity of commerical titanium have been measured over the temperature range from room temperature to 1400°K. The resistivity at 20°C is 78.6 microhm cm. Above this temperature it increases to a flat maximum of 182 microhm cm at the temperature of the hexagonal-body-centered cubic tran…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of Cellulose PhosphatesJ. David Reid and Laurence W. MazzenoCite this: Ind. Eng. Chem. 1949, 41, 12, 2828–2831Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.acs.o…
A simple prescription is given for defining internal coordinates of the bond stretching, bending, out-of-plane bending, and torsional types which yields a kinematically complete set of vibrational coordinates with no redundancies in acyclic molecules and with 6μ redundancies in cyclic molecules, where μ is the number…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface Tensions of Pure Liquids and Liquid MixturesH. P. Meissner and A. S. MichaelsCite this: Ind. Eng. Chem. 1949, 41, 12, 2782–2787Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.acs.org…
A discussion is given of some recent experimental results on the fine structure of the X-ray absorption edges of solids. Recent work has shown the existence for many solids of a pronounced maximum (raie blanche) at the absorption edge. For K-absorption this may be due to one of two causes: (i) a high density of normal…
Fluorescence and phosphorescence spectra, phosphorescence lifetimes, and relative ratios of intensities of fluorescence to phosphorescence of the dibenzoylmethane derivatives of the trivalent ions of Al, Sc, Y, La, Gd, and Lu have been measured. The lifetimes and intensity ratios of the various compounds differ widely…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Paul J. Flory; Statistical Mechanics of Dilute Polymer Solutions. J. Chem. Phys. 1 December 1949;…
An empirical method of calculating mass absorption coefficients is given. Complete tables of constants are presented for calculating μ/ρ for all elements and for wave-lengths less than the K critical absorption wave-length. Partial tables give constants for wave-lengths between the L1 and M1 critical wave-lengths. Cal…