Materials Literature
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Coesite, a high-pressure ${\mathrm{SiO}}_{2}$ polymorph, becomes amorphous during isothermal annealing below the glass transition temperature, ${\mathit{T}}_{\mathit{g}}$, at one-bar pressure. Transmission electron microscopy was used to examine this fusion process (vitrification) below ${\mathit{T}}_{\mathit{g}}$. Th…
Abstract The thermal stability of sodium alginate (SA) and its graft copolymers of acrylonitrile (AN), methyl acrylate (MA), ethyl acrylate (EA) and methyl methacrylate (MMA) has been examined in air atmosphere by means of thermogravimetric analysis. The following order of decreasing stability was found from character…
Abstract Einkristalle von Pr(CH 3 CH 2 COO) 3 (H 2 O) 3 wurden durch Auflösen von frisch gefälltem Praseodymhydroxid in verdünnter Propionsäure und anschließendes Eindunsten bei Raumtemperatur an der Luft erhalten. Die Kristallstruktur (monoklin, P2 1 /c, Z = 4, a = 1034,2(2) pm, b = 1521,2(3) pm, c = 2086,3(7) pm, β…
peer reviewed
Safe cathodic protection (CP) limits are required for prestressed steel in concrete to avoid the risk of hydrogen embrittlement (HE). A CP protection potential more positive than the reversible hydrogen potential is one approach for avoidance of HE. However, it has been demonstrated in the literature that the steel te…
A series of samples of the system Zn x Mg0.8—x Ni0.2Fe2O4 (with x=0,0.2,0.4,0.6 and 0.8), was prepared using the usual ceramic technique. The samples were studies using X-ray diffraction, DTA, TG, TGA and IR spectroscopy. The lattice constant, radius of tetrahedral ion, X-ray density and measured bulk density are foun…
The critical pitting potentials (Epit) of type 304 (UNS S30400) stainless steel (SS) were determined as a function of temperature (373 K to 523 K) and chloride (Cl−) concentration (1.00 x 10−2 mol/kg-H2O to 2.09 mol/kg-H2O [4.54 x 10−3 mol/lb-H2O to 9.48 x 10−1 mol/lb-H2O], m). Steady polarization tests were performed…
The reactivity ratios have been determined for a mesogenic/nonmesogenic comonomer system, namely 5-[4-(4′-methoxyphenyl)phenoxy]pentyl methacrylate/methyl methacrylate. The reactivity ratios were found to be equal and approximately unity. The copolymerization is, therefore, azeotropic and the resulting copolymers poss…
Abstract Several free radical addition polymerizations exhibit the diffusion limited gel or Trommsdorff effect. The models available until recently could not be applied to industrially important semibatch operations and to nonisothermal polymerizations. The recent model of Ray et al. (24) can indeed be applied to such…
Abstract Dinuclear and tetranuclear nickel(II) complexes with 2,6-bis(salicylideneaminomethyl)-4-methylphenol (H3L), [Ni2(L)(pz)(Hpz)(CH3OH)]·CH3OH (1) and [Ni4(L)2(pz)2(CH3OH)] (2) (Hpz = pyrazole), have been synthesized and characterized by infrared and electronic spectra, and by temperature dependence of magnetic s…
Other| February 01, 1996 Scapolite cell-parameter trends along the solid-solution series David K. Teertstra; David K. Teertstra University of Manitoba, Department of Geological Sciences, Winnipeg, MB, Canada Search for other works by this author on: GSW Google Scholar Barbara L. Sherriff Barbara L. Sherriff Search for…
Electron probe X-ray microanalysis has been used for the last 25 years by biologists to obtain information about the distribution of elements at the cell and tissue level. During this period, progress has mainly been made through the development of more adequate techniques for specimen preparation (mainly low temperat…
An optimal thermodynamic data set for the zirconia‐urania system is evaluated by the CALPHAD (CALcula‐tion of PHAse Diagrams) method. A regular solution model is applied to all phases of the cubic, tetragonal, and mono‐clinic solid solutions and the liquid. Comparisons between calculated and measured phase diagrams sh…
Aromatic polyelectrolytes based on sulfonated poly(benzobisthiazoles) (PBTs) have been synthesized by a polycondensation reaction of sulfo-containing aromatic dicarboxylic acids with 2,5-diamino-1,4-benzenedithiol dihydrochloride (DABDT) in freshly prepared polyphosphoric acid (PPA). Several sulfonated PBTs, poly[(ben…
Facile ring-opening polymerization of cyclic aryl ether oligomers containing the 1,2-dibenzoylbenzene moiety to form high molecular weight linear polymers in the presence of a nucleophilic initiator is described. The polymerization can be initiated in the melt in the presence of a nucleophilic initiator such as potass…
Semicrystalline fluoropolymers including poly(tetrafluoroethylene) (PTFE), a 8 mol % hexafluoropropylene (HFP)/92% TFE random copolymer (FEP), and poly(vinyl fluoride) (PVF) were studied using thermally stimulated current depolarization (TSC), ac dielectric, and other thermal analysis techniques. The TSC thermal sampl…
A series of novel bis(phenoxy)naphthalene-containing polyamides having inherent viscosity up to 2.02 dL/g were synthesized by the direct polycondensation of the diamine 1,7-bis(4-aminophenoxy)naphthalene with various aromatic dicarboxylic acids in N-methyl-2-pyrrolidone (NMP) using triphenyl phosphite and pyridine as…
Spherical-nose copper and tantalum rods with aspect ratios between 4.0 and 14.6 were gun launched against 91-cm-diameter and 91-cm-long concrete and simulant reinforced-concrete targets with velocities ranging from 0.15 cm/μs to 0.19 cm/μs. Targets were instrumented with a sequence of break gauges that provided valuab…
Abstract Water inhibits sorption of uncharged organic compounds on montmorillonites saturated with small alkylammonium cations such as tetramethylammonium (TMA) and trimethylphenylammonium (TMPA). As a first step toward understanding the mechanism by which water inhibits arene sorption on TMA- and TMPA-montmorillonite…
The reverse Monte Carlo (RMC) method has been used to generate a model for the atomic structure of amorphous germanium (a-Ge). Fitting to experimental neutron diffraction data and applying coordination number and ``triplet'' constraints, the positions of 3000 ``atoms'' in a box, with full periodicity, were altered unt…