Materials Literature
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Sample disks prepared from Al 2 O 3 (61 wt%), SiO 2 (28 wt%), and Fe 2 O 3 (II wt%) powders were sintered at 1270° and 1440°C and then annealed between 1300° and 1670°C. The annealed samples consisted of mullite as the main compound with minor amounts of glass and sometimes magnetite. The iron content of the mullites…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlexible polymers with excluded volume at a penetrable interacting surfaceJack F. Douglas, Shi Qing Wang, and Karl F. FreedCite this: Macromolecules 1987, 20, 3, 543–551Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 Ma…
A series of tricomponent blends of poly(vinyl chloride)/chlorinated polyethylene/ethylene propylene diene terpolymer (PVC/CPE/EPDM) were prepared and studied. CPE was used not only to improve the room temperature impact resistance of PVC but also as a polymer compatibilizer; while EPDM was used to enhance the impact r…
Abstract The thermal and isothermal crystallization behavior of PET/PMMA (poly(ethylene terephthalate)/poly(methyl methacrylate)) alloys was investigated. The crystallization of PET is accelerated significantly by alloying with PMMA. As a result, crystalline specimens could be injection molded with the alloy at low mo…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural and Stereochemical Studies on Marine Norterpene Cyclic Peroxides, Part 2Robert J. Capon and John K. MacLeodCite this: J. Nat. Prod. 1987, 50, 2, 225–229Publication Date (Print):March 1, 1987Publication History Published online1 July 2004Published inissue 1 March 1…
We have used x-ray diffraction to study the structure of stage-4 through stage-11 potassium-intercalated graphite as a function of temperature. The (00.L) diffraction patterns are analyzed in terms of the Hendricks-Teller model for a disordered one-dimensional crystal. Stage 4--5 samples are best described by phase se…
Abstract The problem of establishing whether or not a certain fibrous textile is the source of a particular single fiber collected from a crime scene is discussed in this paper. A single evidential fiber present at a crime scene can be associated with four major events. These are fiber transfer, persistence after tran…
The field-dependent specific heat of two easy-plane ferromagnetic chains is calculated with extrapolation of numerical results for finite chains. Quantum statistics is applied for the corresponding spin-1 and spin-(1/2) Hamiltonians with single-site and exchange anisotropy, respectively. A drastic reduction of the exc…
A method of using high melting point chain extenders in the synthesis of castable polyurethane elastomers (PU) based on the system polycaprolactone diol (Capa 225) and trans 1,4–cyclohexane diisocyanate (CHDI) was developed based on a semi-prepolymer (quasi) technique in which the high melting point chain extender was…
Modern turbogenerators are designed with high specific loadings. One of the consequences of this is the requirement to design the machine to minimise the size and effects of stator end region leakage fields. This paper describes a finite element method, including both iron saturation and eddy current reaction, to calc…
The dissolution mechanism of cellulose in SO2–amine–dimethylsulfoxide systems was studied by using 1H- and 13C-NMR spectroscopy. SO2 and amine (diethylamine or triethylamine) were found to form a complex in DMSO, and the SO2–amine complex, in turn, reacts with an alcoholic hydroxyl group of methanol to produce a new c…
Polymeric metal (Cu, Mg, Zn, and Ni) and metal-free phthalocyanine thin films were prepared from the gas phase by low-temperature plasma polymerization. Electronic and FT-IR spectra indicated that no extensive alteration or destruction of the original ring structure had occurred. The obtained film showed good rectific…
During anodization for porous silicon formation, a nonelectrochemical dissolution reaction of porous silicon is found in addition to an electrochemical porous silicon formation reaction. The amount of dissolved silicon and the porous silicon density in the anodization process are formulated as functions of hydrofluori…
SUMMARY Uptake of K was measured using a single onion root technique with four soil cylinder diameters, and measuring changes in exchangeable K in the soil. Baldwin's model fitted the measured uptake when only exchangeable K was taken up, but that of Heming & Rowell allowed predictions of uptake of both exchangeab…
Investigations were conducted on the pitting corrosion of zirconium in chloride solution under potentiostatic conditions. Both stable and unstable pitting were observed. Unstable pitting indicated by anodic current oscillations resulting from repetitive new pit nucleation and repassivation were all ultimately repassiv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA novel method of functionalizing the ethyl chain of octaethylporphyrinC. K. Chang and Chariklia SotiriouCite this: J. Org. Chem. 1987, 52, 5, 926–929Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March 1987https://doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLEED study of benzene and naphthalene monolayers adsorbed on the basal plane of graphiteU. Bardi, S. Magnanelli, and G. RovidaCite this: Langmuir 1987, 3, 2, 159–163Publication Date (Print):March 1, 1987Publication History Published online1 May 2002Published inissue 1 March…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIdentification of Antiinflammatory Agents from Sideritis Species Growing in SpainFrancisco A. T. Barberan, Salvador Mañez, and Angel VillarCite this: J. Nat. Prod. 1987, 50, 2, 313–314Publication Date (Print):March 1, 1987Publication History Published online1 July 2004Publis…
Electrochromic iridium oxide films have been prepared by the thermal oxidation of iridium‐carbon composite films (Ir‐C films) obtained by evaporation of Ir from a graphite crucible with an electron gun. The XPS analysis indicates that the Ir‐to‐C ratio in the Ir‐C films lies in a range from 0.061 to 0.165. A change in…
The rate of exocellular levansucrase synthesis in an overproducing (sacUh) strain of Bacillus subtilis was shown to be directly proportional to the amount of two different transient forms of this enzyme located within the membrane fraction of the cells. The apparent Mr of the larger membrane form was 53,000, and that…