Materials Literature
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Abstract We have combined pressure–volume–temperature measurements and high‐temperature x‐ray diffraction to calculate the heat of fusion of the poly(4‐methyl pentene‐1) crystal from the Clapeyron equation. We find Δ H f = 14.8 cal/g, only about half as large as several literature values. The new value of the heat of…
Abstract The kinetic reaction of ferron (8‐hydroxy‐7‐iodo‐5‐quinoline‐sulfonic acid) with partially neutralized Al solutions of varying basicity and age were investigated with the intent of separating mononuclear and polynuclear Al. Ferron solutions buffered with varying quantities of NaOAc, NH 2 OH·HCl, and acetic ac…
Abstract Studies conducted on butadiene–acrylonitrile copolymer (NBR)/poly(vinyl chloride) (PVC) blends at different temperatures indicate that an optimum temperature exists for the formation of a particular blend. The mechanical properties of the blends confirm this observation. PVC stabilizer based on magnesium oxid…
10 GHz electron paramagnetic resonance studies of Fe3+ in synthetic brown α-quartz single crystals have been carried out at 295 and at 40 K. The spin-Hamiltonian parameters were determined including high-spin Zeeman terms of form BS3 and allowing (g,D) matrix noncoaxiality as well as nonuniaxial anisotropy of the g ma…
The effects of ZrO 2 additions on the mechanical properties of four commercial aluminas have been studied, and the changes in intergranular and intragranular ZrO 2 particle sizes during aging have been determined for one of the aluminas. In this ceramic, the intercranular and intragranular ZrO 2 particles coarsen obey…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSymmetry control of the coloring problem: the electronic structure of MB2C2 (M = calcium, lanthanum, ...)Jeremy K. Burdett, Enric. Canadell, and Timothy. HughbanksCite this: J. Am. Chem. Soc. 1986, 108, 14, 3971–3976Publication Date (Print):July 1, 1986Publication History Pu…
Abstract Chemical diffusion coefficients have been derived from experiments on the point defect relaxation in magnetite. Based on data from preceding studies on the nonstoichiometry of magnetite and on the iron tracer diffusion of this oxide, the chemical diffusion coefficients are analyzed with regard to elementary d…
Power Samples of Three Alkylthio Substituted Triphenylenes have been Investigated by X-ray diffraction. All have a hexagonal columnar Dhd phase. In one compound, a phase transition Dho Dhd is found, in which the hexagonal lattice of columns remains unaffected by the order-disorder transition within the columns.
The surface analysis technique of x-ray photoelectron spectroscopy (XPS) has been used to investigate the chemical composition and reactivity of the wool epicuticle. Approximate relative proportions of protein and lipid material in the epicuticle have been deduced from the surface elemental ratios; the sulfur content…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolution crystallization of poly(ether ether ketone)Andrew J. Lovinger and D. D. DavisCite this: Macromolecules 1986, 19, 7, 1861–1867Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986https://pubs.acs.org/doi/10.1…
The three dimensional shape effect of asperity on abrasive wear was investigated with in-situ experiments in the scanning electron microscope. The geometry of model asperity was represented by attack angle and dihedral angle, where attack angle changed in 0∼90 deg and dihedral angle in 0∼180 deg. Wear modes of shearin…
The synthesis and characterization of pyrazine-bridged polymers of iron(II/III), ruthenium(II/III), and osmium(II/III) octaethylporphyrin (dubbed "shish-kebab" polymers) are presented. Optical and dc conductivity measurements reveal that the ruthenium and osmium polymers, when partially oxidized, are highly conductive…
Experimental evidence indicating immiscibility of the homopolymers poly(vinylidene fluoride) and poly(vinyl fluoride), both in the crystalline and amorphous phases, is presented. The X-ray analysis of the blended samples reveals patterns that are relatively insensitive to blend composition and that are similar to thos…
Abstract This paper discusses a mathematical model governing the galvanic corrosion phenomenon and surveys the research efforts which have been applied to find a solution to the above problem. The authors classify these techniques into three categories. The first is the finite difference method (FDM), the second is th…
Chinese hamster V79 multicell spheroids growing in tissue culture exhibit many of the same properties as solid tumors outgrowing their blood supply, including the spontaneous development of both noncycling and hypoxic cell populations expected to be resistant to many chemotherapeutic agents. Cell-sorting techniques we…
Interest in liquid crystalline side-chain polymers has grown tremendously in recent years because of their theoretical aspects and their potential applications. Over the past few years, a considerable research effort has been made in electro-optic display using nematic or smectic. A mesogenic side-chain polymers. On t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular weight distribution dependence of the viscoelastic properties of linear polymers: the coupling of reptation and tube-renewal effectsJ. P. Montfort, G. Marin, and P. MongeCite this: Macromolecules 1986, 19, 7, 1979–1988Publication Date (Print):July 1, 1986Publicatio…
Two new Lowicryl resins have been developed for embedding biological materials at temperatures down to 210 K (hydrophilic K11M) and to 190 K (hydrophobic HM23). They have similar properties to Lowicryl K4M and HM20. The new resins were first tested for low temperature applications by the 'progressive lowering of tempe…
Abstract Isotactic polypropylene has been shown to crystallize from the melt spherulitically at intermediate undercoolings (100–130°C) in the presence of a high amount (40 wt %) of chalk (calcium carbonate). Linear growth rate is not remarkably affected by the presence of a filler. Both nonisothermal and isothermal cr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBand electronic structure of the molybdenum blue bronze A0.30MoO3 (A = K, Rb)M. H. Whangbo and L. F. SchneemeyerCite this: Inorg. Chem. 1986, 25, 14, 2424–2429Publication Date (Print):July 1, 1986Publication History Published online1 May 2002Published inissue 1 July 1986http…