Materials Literature
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Abstract Macrocyelic polyether sulfides have been prepared by reacting an oligoethylene glycol dichloride with a dithiol or sodium sulfide in ethanol. The trivial naming system for these compounds is an extension of the trivial crown nomenclature (5). A thia prefix is used to show that sulfur atoms have replaced ether…
The hydrolysis product of a quaternary amine-containing organosilicon salt, 3-(trimethoxysilyl)-propyldimethyloctadecyl ammonium chloride, was found to exhibit algicidal activity while chemically bonded to a variety of substrates. Six representative species of Chlorophyta, Cyanophyta, and Chrysophyta were used to eval…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolvation of the polymer matrix. Source of truncated and failure sequences in solid phase synthesisWilliam S. Hancock, David J. Prescott, P. Roy Vagelos, and Garland R. MarshallCite this: J. Org. Chem. 1973, 38, 4, 774–781Publication Date (Print):February 1, 1973Publication…
The temperature dependence of the EPR linewidth of the ${\mathrm{Fe}}^{3+}$ -${V}_{\mathrm{O}}$ pair center in SrTi${\mathrm{O}}_{3}$ has been investigated above and below ${T}_{c}=105.6$ K. It is shown from the angular dependence that the pronounced line broadening near ${T}_{c}$ results from rotational fluctuations…
A perturbation solution is obtained for outward and partial inward spherical solidification of a liquid initially at the freezing temperature. The constant-wall-temperature boundary condition is considered with the properties of the solidified material assumed as constants. A nonlinear transformation is applied to the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDimeric structure of a copper phthalocyanine polymorphJames H. Sharp and Martin AbkowitzCite this: J. Phys. Chem. 1973, 77, 4, 477–481Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://pubs.acs.org/…
Abstract As model polymers for isolated short‐chain branches in low‐density polyethylene, a series of ethylene–1‐olefin copolymers was examined by use of 13 C NMR at 25.2 MHz. An array of 13 C resonances was observed that could be associated independently with methyl through amyl branches. The 13 C chemical shifts bec…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSteric and electronic effeccts in the coordination of amines to a cobalt(II) porphyrinF. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 4, 1150–1153Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973http…
It is shown that the Frank elastic constants may be expressed in terms of even-order Legendre polynomials averaged over the one-molecule orientational distribution function. In particular, it is found that $\frac{({K}_{11}\ensuremath{-}\overline{K})}{\overline{K}}=C\ensuremath{-}3{C}^{\ensuremath{'}}\frac{{\overline{P…
We present a theoretical and experimental study of the electron-spin-resonance (ESR) line shape in Heisenberg linear-chain systems which have small but non-negligible interchain coupling. Weak interchain coupling can drastically alter the characteristic one-dimensional line shape as well as produce three-dimensional o…
Abstract Dielectric constants and loss tangent (100 hz-50Mhz), composition, textures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistical mechanical theory of solubilityR. O. Neff and D. A. McQuarrieCite this: J. Phys. Chem. 1973, 77, 3, 413–418Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://pubs.acs.org/doi/10.1021/j10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropoly 12-metallophosphates containing tungsten and vanadium. Preparation, voltammetry, and properties of mono-, di-, tetra-, and hexavanado complexesDorothy P. Smith and Michael T. PopeCite this: Inorg. Chem. 1973, 12, 2, 331–336Publication Date (Print):February 1, 1973…
Abstract X-ray diffraction patterns of garnierites indicate that most samples resemble serpentine-group minerals or a talc-like mineral, or a mixture of these forms, and give respectively 7 Å and 10 Å basal reflections. From a survey of some 40 garnierites, four of predominantly serpentine type and seven of predominan…
Dynamic yield strengths, compression data under uniaxial shock-wave loading, and sonic velocities at 1 bar are reported for polycrystalline TiB2, SiC, Be4B, Be4B+8 wt% BeO, Be2B, AlB12, TiBe12, and ZrBe13. Hugoniot elastic limits were measured as 86, 80, 74, 77, 65, 87, 53, and 71 kbar, respectively. Evidence of phase…
The uniaxial tensile deformation of a fabric is analysed as a special case of the biaxial theory presented in Part I, and the bending rigidity of the yarn at right angles to the tensile direction is introduced. The structural model presented in Part I is used again to solve the uniaxial case. The biaxial-deformation t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of monomeric cobalt-oxygen complexes. I. Thermodynamics of reaction of molecular oxygen with five- and six-coordinate amine complexes of a cobalt porphyrinF. Ann. WalkerCite this: J. Am. Chem. Soc. 1973, 95, 4, 1154–1159Publication Date (Print):February 1, 1973Publ…
The over-all shear deformation, that is, the combined deformation of biaxial tensile and shear deformation is considered generally, and a theory by which the mechanical behaviour of fabrics in this slate can be determined is presented. Experiments are also described that were made to confirm the accuracy of these theo…
Evidence for electronic conduction in the preswitching region of chalcogenide glasses is outlined and discussed in terms of several simple models. Electronic processes likely to contribute to the switching process itself are reviewed and compared, where possible, with the predictions of relevant models from convention…
ABSTRACT The objective of this study is to locate as closely as possible the sites of strontium, magnesium, sodium, and potassium in modern aragonitic corals, specifically whether these cations are adsorbed, or are substituted in the carbonate lattice or are incorporated in organic components. In addition to locating…