Materials Literature
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When a crosslinked network is deformed unidimensionally, the distribution of chain displacement vectors becomes rather well oriented along the stretching direction. It is shown that the distribution function w(cosχ) pertaining to the individual statistical segments comprising the network chains may be expressed in a s…
With the purpose to elucidate the nature of luminescence transitions in ZnS crystals, emission spectra from typical luminescence centers, “Green-Cu”, “Blue-Cu”, Self-Activated, “Red-Cu”, and “Red-Cu, In” centers, were measured at various temperatures. The results show that these luminescences can be divided into two g…
An extensive experimental examination of conductivity glow curves and their analysis has been made on a variety of CdS crystals. A large number of analytical methods have been used to evaluate trap depths and capture cross sections. It is shown that it is possible to obtain consistent results and determine whether ret…
The complete absorption of P-polarized light at oblique incidence on metal films is accompanied by sharply characteristic variations of reflection factor with angle of incidence; these are described by graphs as functions of the complex refractive index and proposals are made for using them to determine the complex re…
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…