Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymer/Polymer Diffusion. 2. Effect of Temperature and Molecular Weight on Macromolecular Diffusion in Blends of Poly(vinyl chloride) and Poly(ε-caprolactone)P. T. Gilmore, R. Falabella, and R. L. LaurenceCite this: Macromolecules 1980, 13, 4, 880–883Publication Date (Print…
The solid products of decomposing CaCO 3 powder in vacuum at 510°C (sr‐CaO) and of decomposing Ca(OH) 2 powder at 320°C in vacuum (h‐CaO) are particles which have approximately the same exterior dimensions as the parent CaCO 3 or Ca(OH) 2 particles. N 2 adsorption and desorption isotherms show that sr‐and h‐CaO have h…
A study was made of the overpotential and product selectivity characteristics of the high temperature solid electrolyte fuel cell It was found that is the primary oxidation product, although significant amounts of by‐product are also formed due to the catalytic reaction between and on Pt. The influence of this side re…
Abstract The relation between the relaxation behaviour of photochromic aromatic azo benzenes and spiropyrans in a series of amorphous polymers and the polymer properties has been investigated. The distinctive differences of the rate of thermal isomerization found below and above T g and also compared to solution can b…
Synthesis of LaAl 11 O 18 by the solid‐state reaction of La 2 O 3 and Al 2 O 3 occurs in two stages, i.e. LaAlO 3 forms immediately at 1450°C in air but LaAl 11 O 18 formation is very slow and requires up to 141 days. First‐order kinetics were observed and an activation energy of 118±4 kcal was calculated. Formation o…
R‐T and I‐V characteristics of single grains and grain boundaries in large‐grained BaTiO 3 PTC ceramics were studied with a two‐probe technique using a micromanipulator and fine Al wire. The PTC originates in the grain boundary only and behaves differently in each boundary. Even below T c , the ceramic resistance depe…
An ac calorimetric technique has been used to study the nematic---smectic-$A$ ($N\ensuremath{-}\mathrm{Sm}A$) and nematic-isotropic ($N\ensuremath{-}I$) transitions in octyloxycyanobiphenyl (8OCB) along a series of isobars between 1 atm and 2 kbar. The excess heat capacity $\ensuremath{\Delta}{C}_{p}(\mathrm{NA})$ ass…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of metathesis and epoxidation in chromium and molybdenum complexes containing methyl-oxo bondsAnthony K. Rappe and William A. Goddard IIICite this: J. Am. Chem. Soc. 1980, 102, 15, 5114–5115Publication Date (Print):July 1, 1980Publication History Published online1…
Growth of films and scales on was investigated in oxygen at 1 atm over the temperature range 1273°–1573°K. An initial sub‐microcrystalline oxide film recrystallized during its growth to a textured film containing polycrystalline ridges. Inert marker measurements demonstrated that the initial film grew by inward diffus…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of coordinated carbon monoxide toward alkyl and aryl migration (carbon monoxide insertion) by molecular Lewis acids and x-ray structure of the reactive intermediateSusan Beda Butts, Steven H. Strauss, Elizabeth M. Holt, Rebecca E. Stimson, Nathaniel W. Alcock, and…
Dielectric susceptibilities are reported for $\mathrm{K}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{Nb}}_{x}{\mathrm{O}}_{3}$ and ${\mathrm{K}}_{1\ensuremath{-}y}{\mathrm{Na}}_{y}\mathrm{Ta}{\mathrm{O}}_{3}$ mixed-crystal ferroelectrics with a Curie temperature ${T}_{C}$ close to absolute zero. According to the temperatu…
Matrix protein, a pore-forming transmembrane protein spanning the outer membrane of Escherichia coli, has been obtained in a variety of three-dimensional crystal forms amenable to both electron microscope and x-ray analyses. Successful association into large crystals depended on the use of alpha-octyl glucoside, a det…
electron microscopy. They were assigned to the genus Amphora Ehr. ex Kutz., although previous investigators had most often treated the diatom as Cymbella parvula Krasske or Cymbella thumensis (Mayer) Hust. Characteristics influencing the genus assignment include differential mantle development, multiple intercalary ba…
Abstract The connection between intrinsic viscosity and number‐average and weight‐average molecular weight has been revealed by calculations from distribution curves. Log‐normal distributions, and moderate variations thereon, were chosen as typical for polystyrene and other thermoplastics. Intrinsic viscosity and numb…
Mixtures of MnO and graphite were reacted under argon at temperatures ranging from 1200 to 1425i?½C, and the loss in mass of the mixture was recorded continuously. The results showed that the rate of reduction of MnO increased as the temperature increased and the ratio of MnO to C decreased. The effect of the particle…
Abstract Since the discovery by Goodyear in 1839 that the physical properties of rubber may be improved with sulfur, it has been the most commonly used crosslinking agent. The rubber industry is concerned with the production of homogeneous products with appropriate physical properties, by compounding rubber with ingre…
1. The incisor position should be evaluated in relation to the sagittal and vertical configurations of the face, as well as to the shape of the bony chin. 2. A floating norm for the positioning of the lower incisors is established based upon the guiding variables ANB, ML-NL and the N angle with the introduction of a m…
Abstract Durch Fällungsreaktion aus Natriumsilicatlösungen mit Calciumsalzen entstehen bei 0°C schlecht geordnete Calciumhydrogensilicate, deren Anionenaufbau primär dem des Natriumsilicates in der Lösung entspricht. Sie sind aber nicht stabil und werden in der Mutterlauge bei 0°C in Disilicat mit einer Zusammensetzun…
A method is presented for estimating the number of domain walls in grain-oriented 3% Si-Fe tape wound cores under sinusoidal flux conditions by extending the method developed in a study of the dynamic behavior of 50% Ni-Fe square-loop cores. The results show that the number of domain walls increases approximately with…
Abstract An attempt has been made to review the development of thermoanalytical procedures as they have been applied to elastomers and elastomer systems over the past 10 years. For all rubber industry products, temperature and its effects, either alone or in conjunction with the chemical environment, play an important…