Materials Literature
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The theory of the Lifshitz point, a triple point in the phase diagram of systems with incommensurate phases, is extended to systems in which the direct para-ferro transition is first order. The structure of the phase diagram is shown to be considerably more complex than in the usual case of a second-order direct trans…
Abstract This paper reports a rapid method to identify the presence of nonswelling clay, swelling clay, or a mixture of the two types of clays in a soil from the sediment volumes occupied by 10 g of dry soil in 100 mL of water and carbon tetrachloride, respectively, under no external constraint. Soils that occupy a se…
The ultrasonic degradation of poly(vinyl alcohol) (PVA) in aqueous solution and copolymerization of PVA with acrylonitrile (AN) were studied. It is confirmed that the rate of degradation of PVA follows the kinetic equation suggested by Baramboim. Both water-soluble and water-insoluble copolymer can be obtained by chan…
Abstract By means of cationic ring‐opening polymerization a wide variety of telechelic polymers can be prepared. After a general description of the chemistry of this kind of polymerization, the introduction of functional end groups by initiation, by end capping and by transfer reactions is described. The following mon…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsolation and characterization of a five-coordinate manganese(III) porphyrin cation. Crystal and molecular structure of aquo(tetraphenylporphinato)manganese(III) triflateMichael M. Williamson and Craig L. HillCite this: Inorg. Chem. 1986, 25, 26, 4668–4671Publication Date (P…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA picosecond study of rapid multistep radiationless decay in manganese(III) porphyrinsXinwei Yan, Christine Kirmaier, and Dewey HoltenCite this: Inorg. Chem. 1986, 25, 26, 4774–4777Publication Date (Print):December 1, 1986Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetrakis(tetraethylammonium) dodecachlorotetracuprate(4-), a new structural type for a tetranuclear copper(II) halide complexR. D. Willett and Urs GeiserCite this: Inorg. Chem. 1986, 25, 25, 4558–4561Publication Date (Print):December 1, 1986Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of Styrene/Maleimide Copolymers and Physical Properties ThereofEugene Moore and Dale PickelmanCite this: Ind. Eng. Chem. Prod. Res. Dev. 1986, 25, 4, 603–609Publication Date (Print):December 1, 1986Publication History Published online30 January 2004Published inissu…
Liquid crystal material photostability was investigated for application in high intensity projectors operating with both near ultraviolet (UV) and visible light. Commercially available mixtures were studied in transparent test cells and their lifetimes were correlated with their chemical structures. Substantial improv…
Abstract Heat capacities were measured for poly(4‐methylstyrene) [300–500K], poly(4‐fluorostyrene) [130–350K], poly(4‐chlorostyrene) [300–550K], poly(4‐bromostyrene) [300–550K], poly(4‐iodostyrene) [300–550K] and poly(styrene‐ co ‐divinylbenzene) with 1, 2, 4, 8, and 12 wt.% divinylbenzene (technical grade) [300–550K]…
Abstract Since a carbon‐oxygen double bond is considerably more stable than a carbon‐carbon double bond, it has been possible to use this driving force to promote free radical ring‐opening polymerization of unsaturated heterocyclic compounds. This process, for the first time, has permitted the introduction of function…
The S matrix is first introduced within the framework of the angular spectrum representation of wave fields interacting with linear dielectric bodies of arbitrary shape. By using some universal properties of the S matrix, a number of relations involving certain generalized reflection and transmission coefficients are…
The shapes of two- , four- , and five-dimensional linear and ring polymers, with and without excluded volume, are investigated numerically via Brownian dynamics. It is found that the asphericity of nonexcluded volume linear polymers is in agreement with theoretical predictions in all dimensions. Agreement with availab…
Abstract Imogolite, though achiral, forms cholesteric spherulites in the anisotropic phase as shown by the regular striations arranged in a swirl‐like or fingerprint pattern observed through a polarizing microscope. Electron microscopy revealed the raft‐like imogolite sheet floating in the anisotropic phase. The struc…
Hydrogenated amorphous carbon films with high contents of sp 3 bonds have been prepared by a glow-discharge-decomposition of CH 4 and H 2 mixture. The film thickness and the optical gap of the films were gradually reduce up to annealing at 350°C by the densification of the film; they rapidly reduce above 350°C. The hy…
The drapemeter is a useful method for characterizing the behavior of fabrics, and the drape coefficient has been empirically related to bending and shear stiffness. As part of a wider study of complex buckling, we have found that the geometric form of deformation can be related to two dimensionless groups, relating be…
Abstract The sorption and diffusion of a series of liquids in a segmented polyurethane have been studied to determine how the behavior is affected by the choice of solvent and the heterophase nature of the polymer. The polyurethane was composed of methylene‐di‐para‐phenylene isocyanate (MDI) butanediol, and poly(tetra…
Abstract Aqueous sodium polysulfide of composition in the range Na 2 S 2.0 to Na 2 S 4.6 undergoes autoxidation by either air or pure oxygen at temperatures of between 23 and 40 °C according to the equation [xxx] Iodometric determination, vibrational spectra and ion-pair chromatography showed that neither sulfate, sul…
Abstract The calculated carbon 1s (C1s) core energy‐level positions of PMDA‐ODA polymide and of its polyamic acid precursor are compared with the level positions inferred from XPS measurements. For the polyamic acid, calculation and experiment both yield a difference of approximately 1 eV between the carboxylic acid a…
Raman scattering and infrared absorption studies of ferroelectric SbNb${\mathrm{O}}_{4}$, antiferroelectric BiNb${\mathrm{O}}_{4}$, and the solid solution $({\mathrm{Sb}}_{1\ensuremath{-}x}{\mathrm{Bi}}_{x})\mathrm{Nb}{\mathrm{O}}_{4}$ for $0<x<1$ in the range 20-1200 ${\mathrm{cm}}^{\ensuremath{-}1}$ are report…