Materials Literature
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Abstract Oxidation of many polymers occurs by a free‐radical, chain mechanism similar to that developed for the oxidation of volatile hydrocarbons. The rate at which various polymers oxidize and the extent of the reaction is influenced both by the physical and by the chemical structure of the particular polymer. Impor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEvidence for a Cooperative Intramolecular Transition in Poly-L-prolineF. Gornick, L. Mandelkern, A. F. Diorio, and D. E. RobertsCite this: J. Am. Chem. Soc. 1964, 86, 13, 2549–2555Publication Date (Print):July 1, 1964Publication History Published online1 May 2002Published in…
Electrical resistivity and Seebeck coefficient values were measured on compact polycrystalline samples from the MoSe2−WSe2 and MoTe2−WTe2 systems. In the telluride system the resistivity versus temperature data indicated a number of activation energies from room temperature to the dissociation temperature. In the sele…
Phase equilibrium relations in the system Li 2 O‐GeO 2 were determined using standard quenching techniques. In contrast to published literature five congruently melting compounds were found to exist. They are Li 2 O·7GeO 2 , 3Li 2 O O·8GeO 2 , Li 2 O O·GeO 2 , 3Li 2 O O·2GeO 2 , and 2Li 2 O.‐GeO 2 . The melting points…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCHO Gas Phase Compositions in Equilibrium with Carbon, and Carbon Deposition Boundaries at One Atmosphere.E. J. Cairns and A. D. TevebaughCite this: J. Chem. Eng. Data 1964, 9, 3, 453–462Publication Date (Print):July 1, 1964Publication History Published online1 May 2002Publi…
Abstract Several investigators have proposed mechanisms for the delayed action sulfur vulcanization of rubbers which postulate that a number of intermediate compounds containing fragments of the accelerator are formed during the vulcanization cycle. Although a number of workers have measured the change in initial acce…
Abstract The response of the delay time and specific rate of vulcanization (treated as first order) to changes in starting concentrations of accelerator, sulfur and activator in the system: natural rubber-sulfur-MBT-Zn ++ was defined by empirically derived relationships. The effects of compounding variables on the num…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal Chemistry of the Rhombohedral MO3.3R2O3 CompoundsE. A. Aitken, S. F. Bartram, and E. F. JuenkeCite this: Inorg. Chem. 1964, 3, 7, 949–954Publication Date (Print):July 1, 1964Publication History Published online1 May 2002Published inissue 1 July 1964https://pubs.acs.o…
Abstract : This study is concerned with the analysis of the structural behavior of composite materials. It is shown that composite materials can be designed to produce a wide range of mechanical properties. Thus, a structural designer now has at his disposal an added dimension in optimum design - the materials optimiz…
Metastable Fe-Cu solid solutions with Cu concentrations up to 80% were obtained by simultaneous vapor deposition of Fe and Cu on cold substrates. Alloys with less than 50% Cu are bcc and ferromagnetic, the average magnetic moment per atom being slightly higher than for simple dilution. The Curie temperature decreases…
The elastic modulus and transverse bend strength of pure, dense alumina specimens were determined as a function of grain size (1 to 250μ) and temperature (30° to 1500°C). The elastic modulus was essentially independent of grain size over the temperature range covered. The transverse bend strength for fine–grain–sized…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDilute Solution Properties of a Styrene—Methyl Methacrylate Block CopolymerSonja KrauseCite this: J. Phys. Chem. 1964, 68, 7, 1948–1955Publication Date (Print):July 1, 1964Publication History Published online1 May 2002Published inissue 1 July 1964https://doi.org/10.1021/j100…
The addition of minor amounts of MgO or NiO to Al 2 O 3 inhibits grain growth during sintering and allows the sintering process to proceed to theoretical density by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries. The inhibition of grain growth is accomplished by the segregation o…
The Raman crystal spectra of KTcO4, KReO4, Na2MoO4, Na2WO4, Na2MoO4·2H2O, and Na2WO4·2H2O, and the Raman aqueous spectra of TcO4— and MoO42— have been observed. Infrared spectra of Nujol mulls of all the salts were measured in the rock salt region. Infrared spectra in the CsBr region were also obtained for Na2MoO4 and…
Ni-rich Ni-Fe and Ni evaporated polycrystalline films, the thickness of which is larger than a critical value, were found to be composed of stripe domains running parallel to the field previously applied to the films. B-H loops and magnetoresistance effect revealed that the magnetization in each domain points in one s…
Abstract A method for rapid freezing is described in which use is made of the good heat conducting properties of silver. The freezing was accomplished by bringing the tissue in contact with a polished silver surface at the temperature of liquid nitrogen either at atmospheric or reduced pressure. Helium gas flowing ove…
Abstract The effect of pH of the buffered saturating solution on the cation‐exchange capacity (CEC) of 60 Wisconsin soils was determined within the pH range 2.5 to 8.0. The relative contributions of clay and organic matter to total CEC were measured using multiple regression analyses; the independent variables were cl…
The lattice parameters of single-crystal SrTiO3 were determined by x-ray diffraction as a function of temperature from 4.2° to 300°K. In addition to the normal cubic structure three significant regions were found. From 65° to 100°K a tetragonal modification exists (c/a=1.00056), from 35° to 55°K line splitting consist…
The equilibrium pressure of the calcite-aragonite transition has been determined near 100 degrees C and is 4.35 kilobars. These data are in agreement with earlier work but conflict with the most recent determination by Simmons and Bell.
The temperature dependence of the spin-lattice relaxation time ${T}_{1}$ of trivalent rare-earth impurities in Ca${\mathrm{F}}_{2}$ has been measured at 9.6 kMc/sec using pulse saturation techniques. The rare earths investigated include Kramers ions (${\mathrm{Ce}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Dy}}^{3+}$, ${…