Materials Literature
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Abstract Tongue-and-groove pliers are often used in burglaries to twist off doorknobs (to gain entrance) and it was deemed necessary to determine if new, sequentially manufactured pliers would each produce similar toolmarks that would be indistinguishable. Evaluation of the toolmarks from three sets of sequentially br…
Void formation is shown to be a significant response of styrene-isoprene-styrene block copolymers under conditions of tensile stress relaxation. When brought to zero stress, these voids are observed to close and heal, restoring the original mechanical properties of the undamaged material. Dark-field optical microscopy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of trichlorobis(4-cyanopyridine-N1)iron(III): a rare example of a MX3L2 trigonal-bipyramidal complex of iron(III)Jean Claude Daran, Yves Jeannin, and Liliana Maria MartinCite this: Inorg. Chem. 1980, 19, 10, 2935–2940Publication Date (Print):O…
Abstract The role of surface renewal and feedback phenomena in devolatilization equipment is clearly illustrated via staged models. A continuous model for the vented, single‐screw devolatilizer is developed, including barrel evaporation and bulk surface renewal as well as backmixing, which represents de‐volatilization…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReactions of .alpha.,.beta.-epoxysilanes with Grignard reagents. Generation and trapping of .alpha.-trimethylsilyl aldehydes and ketonesPaul F. Hudrlik, Anne M. Hudrlik, Raj N. Misra, David Peterson, Gregory P. Withers, and Ashok K. KulkarniCite this: J. Org. Chem. 1980, 45,…
The fate of s.c. implants of fibrous, trypsin-purified human dermal collagen and collagen cross-linked with formaldehyde and glutaraldehyde has been studied in rats. Dermal collagen, and untreated skin implants, underwent resorption associated with a pronounced round-cell reaction. While collagen implants cross-linked…
Abstract Different methods of measuring elastic constants of nematic liquid crystals by deformation of homogeneously and homeotropically oriented layers through external magnetic and electric fields, respectively, are critically examined. Possible sources of uncertainties are quantitatively explored. An approximative…
Abstract The thermal decomposition of poly(vinyl chloride) (PVC) mixed with several metal oxides was investigated by direct pyrolysis in a mass spectrometer (MS) and flash pyrolysis–gas chromatography. Our results show that the thermal decomposition of PVC occurs in two stages. Unsubstituted aromatic hydrocarbons (ben…
Abstract The pH, Eh, electrical conductivity (EC), and the amounts and valency of replaceable iron were measured periodically on Fe 2+ - and Fe 3+ -saturated montmorillonite and cation-exchange resin at three temperatures. Differences in the pattern of change of pH, Eh, and EC with time appear to be related more to th…
Binary copper alloys containing 25 and 50% manganese were corroded in sodium chloride solution at various fixed potentials spanning their corrosion potential. Both Cu‐Mn alloys exhibited dealloying at a high rate. The Cu‐25%Mn alloy exhibited dealloying behavior similar to that observed in the Cu‐Zn and Cu‐Ni systems.…
Optical reflectivity spectra of the first-row transition metal intercalation complexes, M1/3NbS2 and M1/3TaS2 (M = V, Cr, Mn, Fe, Co, Ni), Mn1/4 TaS2 and Fe1/4 NbSe2 have been measured at room temperature and compared with those for the host compounds, 2H NbS2, 2H TaS2 and 2H NbSe2. It is found that a simple rigid-ban…
In the present note we propose a method of solution of the nonuniform Percus–Yevick equation. It was showed that application of the Fourier transform technique to the three-dimensional problem with a planar symmetry leads to an essentially one-dimensional mathematical problem. In the case of hard spheres in contact wi…
Abstract Parameters are developed for predicting rheological changes during ionic, condensation, and free‐radical polymerization. Polymerization is viewed as changes in molecular weight and concentration for polymer solutions. Polymerization data in the laboratory and in tubular reactors are shown to be consistent wit…
The ultrastructure of the epidermal cells which migrate over the wound surface of the amputated limb of the adult newt, Notophthalmus viridescens, was observed with transmission (TEM) and scanning (SEM) electron microscopy. In order to aid in the visualization of polyanionic surface materials on the wound epithelium a…
Molecular deformation of polypropylene (PP) was investigated by stress infrared experiments on ultraoriented isotactic PP samples, and the results were compared with single chain deformation calculations. A nonlinear stress-strain curve of PP was determined in a strain range of 8% which resulted in an average chain mo…
Alleles of the silk fibroin locus from 22 inbred stocks of Bombyx mori were compared. Nineteen alleles differing from one another in length and internal sequence organization were distinguished. Individuals from a single stock generaly are homozygous for a particular allele, as judged by their gene restriction pattern…
Abstract Vernadite (MnO 2 ·nH 2 O) is a mineral with a poorly ordered structure. Its synthetic analogue is designated δ -MnO 2 . Birnessite and vernadite are independent mineral species and cannot be described further under the same name. They have similar hexagonal unit-cell parameters, a 0 , but different c 0 parame…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal and molecular structure of the six-electron-reduced form of metatungstate Rb4H8[H2W12O40]..apprx.18H2O: occurrence of a metal-metal bonded subcluster in a heteropolyanion frameworkY. Jeannin, J. P. Launay, and M. A. Seid SedjadiCite this: Inorg. Chem. 1980, 19, 10, 2…
Low- and high-angle grain boundaries, and twin boundaries in aluminium and copper have been observed during in-situ electron irradiation using a high-voltage electron microscope. Evidence is presented for dislocation mechanisms of point-defect absorption in all three types of interface. In grain boundaries, climb of e…
Für Magnesiumhydrid, das möglicherweise als reversibler Wasserstoffspeicher verwendet werden kann, wurde eine Synthese entwickelt, die unter milden Bedingungen verläuft und auch im größeren Maßstab ausgeführt werden kann. Besonders aktive Katalysatoren erhält man durch Umsetzen von Anthracenmagnesium mit Chrom-, Titan…