Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntermediates in the titanocene-promoted fixation-reduction of molecular nitrogenEugene E. Van Tamelen, Douglas A. Seeley, Stewart W. Schneller, H. Rudler, and W. CretneyCite this: J. Am. Chem. Soc. 1970, 92, 17, 5251–5253Publication Date (Print):August 1, 1970Publication Hi…
Abstract Synthesis of the first totally organic spiro polymer was accomplished by the reaction of 1,4‐cyclohexanedione and pentaerythritol in benzene plus a trace of p ‐toluenesulfonic acid to produce the polyspiroketal. The polymer did not melt, but began to decompose at 350°C. Although it was insoluble in most commo…
An investigation has been conducted to explore the possibility of using solid state Al2O3 in thermoluminescent dosimetry. The dosimeters were exposed to radiation energies ranging from 100 keV to 35 MeV. They displayed a constant response from 500 keV to 35 MeV comparable to LiF, and permitted accurate readings from 1…
Vanadium dioxide undergoes a crystallographic phase transformation at 68°C which is accompanied by a large and abrupt change in resistivity. Two devices, a two-terminal threshold switch and a four-terminal thermal relay, based on this effect are investigated theoretically and experimentally with regard to switching ap…
Abstract Poly(ethylene adipate), poly(ethylene suberate), and poly(ethylene sebacate) were synthesized by a modified ester interchange procedure. Polydispersity was reduced and low molecular weight material removed by fractional crystallization. Samples of 50–60% crystallinity were prepared by bulk crystallization and…
Tomoharu Ama, Jinsai Hidaka, Yoichi Shimura; Optical Resolution of a Heteropolymolybdate Anion, Bulletin of the Chemical Society of Japan, Volume 43, Issue
Abstract Rates of crystallization of copolyamides of nylons 66 and 6 have been measured by a photometric technique using a hot‐stage microscope. The copolymers all show some crystallinity, but the temperatures of crystallization are reduced as more comonomer is introduced. A close correlation between melting and cryst…
Permanent setting of wool fabrics can be achieved by setting in steam autoclaves at temperatures above 100°C. An account is given in this paper of experiments performed on a laboratory scale and on full-scale equipment in which fabrics were set in rolls. One of the main problems in this kind of process is to ensure an…
A combination of reflectivity, adhesion and resistance measurements has been used to measure the rates of phase boundary movement in thin-film couples during the interdiffusion of gold and aluminium. The various measurements have been compared and correlated to show that diffusion occurs in two distinct stages. The fi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatechol complexes with siliconDennis W. BarnumCite this: Inorg. Chem. 1970, 9, 8, 1942–1943Publication Date (Print):August 1, 1970Publication History Published online1 May 2002Published inissue 1 August 1970https://pubs.acs.org/doi/10.1021/ic50090a038https://doi.org/10.1021…
Abstract A new fused aromatic heterocyclic tetraamine 2,3,11,12‐tetraaminodiquinoxal [2,3‐e,2′,3′‐1] pyrene has been prepared and polymerized with 1,4,5,8‐naphthalenetetracarboxylic acid and pyromellitic dianhydride. The resulting ladder polymers with inherent viscosities ranging from 0.5 to 1.0 dl/g in methanesulfoni…
Abstract Mössbauer spectra were measured for a series of the central iron in Fe(II)- and Fe(III) complexes of tetraphenylporphin. The electronic structure of the central iron in the complex was modified by the axial ligand field. The Mössbauer spectra assigned the most probable electronic configurations to various iro…
Density and lattice parameter changes induced by dopants were studied in Czochralski rubies containing from 0.054 to 0.160 wt% Cr 2 O 3 , in Czochralski sapphires containing from 0.083 to 0.120 wt% TiO 2 , and in verneuil crystals grown from powders containing 250 to 1000 ppm Ca, Mg, Si, and V. Densities were determin…
Abstract The degradation in vacuo of the cured resin from stoichiometric amounts of the diglycidyl ether of bisphenol A and p,p′ ‐diaminodiphenylmethane was studied at temperatures of 303.7 and 304.0 ± 0.2°C. The condensible products of the degradation at these temperatures were collected and the major components were…
Abstract Soil vermiculite clays of varying tetrahedral and octahedral composition and cation exchange capacity (CEC) were examined for their ability to fix K + in both the wet and dry states. Fixation capacity, expressed as per cent of the CEC, in the wet state was fairly high for most samples but it was enhanced grea…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding in dye aggregates. Energetics of the dimerization of aqueous cobalt(II)-4,4',4'',4'''-tetrasulfophthalocyanine ionZ. A. Schelly, D. J. Harward, Paul Hemmes, and Edward M. EyringCite this: J. Phys. Chem. 1970, 74, 16, 3040–3042Publication Date (Print):August 1, 1970Pu…
A method has been developed for calculating the effective complex permittivity of a solid dielectric arising from the motion of charge carriers which are blocked at the electrodes. The method makes use of computer simulation of the motion of the charge carriers and is valid for high voltages. Results are given of calc…
Abstract A new class of high molecular weight polyarylsulfones is described. Polymer synthesis and structure–property relationships are discussed. The polymers are prepared by Friedel‐Crafts type polycondensation of aromatic sulfonyl chlorides with aromatic hydrocarbons. A number of Lewis acids in small quantities are…
The Green's function method developed by Mahan for excitons is extended to the case that the interaction is not instantaneous. Energy corrections to the exciton due to recoil effects, retardation effects, renormalization constants and vertex parts arising from the interactions of an electron and a hole forming an exci…
The elastic properties of Mn${\mathrm{F}}_{2}$ have been investigated in the temperature range $4.2<T<330$ K using a cw transmission technique. The measured values at $T=300$ K of the six adiabatic elastic constants in units of ${10}^{11}$ dyn/${\mathrm{cm}}^{2}$ are ${c}_{11}=10.24$, ${c}_{33}=16.55$, ${c}_{44}…