Corrosion by Alternating Current: Polarization of Mild Steel in Neutral Electrolytes
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Materials Literature
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Localized volume deficiencies as an effect of spherulite growth. I. The two‐dimensional case
Abstract Two‐dimensional spherulite growth leads to the encirclement of regions of molten polymer in a polymer film. On further crystallization localized volume defects arise, resulting in thin spots in the film. Since this effect lowers the mechanical strength of films, we call these volume defects “weak spots.” A co…
Ceramic Materials for the Immobilization of Nuclear Waste
Gallium is a metal that literally melts in your hand. It has low toxicity, near-zero vapor pressure, and a viscosity similar to water. Despite possessing a surface tension larger than any other liquid (near room temperature), gallium can form nonspherical ...Read More
Graft polymerization of acrylic monomers onto starch fractions. I. Effect of reaction time on grafting methyl methacrylate onto amylose
Abstract A study was made of the ceric‐ammonium‐nitrate‐initiated graft polymerization of methyl methacrylate (MMA) onto a lineal fraction of starch (amylose). Grafting yields were determined by extraction with appropriate solvents: 1,2‐dichloroethane for homo‐PMM, and 0.5 N NaOH for ungrafted amylose. Percent graftin…
Vacuum-ultraviolet refractive index of LiF and MgF_2 in the temperature range 80–300 K
The refractive indices of LiF and MgF2 have been measured with an accuracy better than ±0.003 from 200 nm down to their respective cutoff wavelengths for various temperatures ranging from 80 to 300 K. For LiF, the temperature coefficient changes sign at 160 nm. The data were fitted to a two-term dispersion equation. T…
Crystallization kinetics in the system CaMgSi 2 O 6 -CaAl 2 Si 2 O 8 ; the delay in nucleation of diopside and anorthite
The nucleation of diopside and anorthite is always delayed under supercooled conditions. The delay in nucleation decreases with increasing degree of supercooling or increasing cooling rate. With further increase in the degree of supercooling or the cooling rate, the delay in anorthite nucleation increases. For a given…
The Complete Primary Structure of the Allosteric l‐Lactate Dehydrogenase from Lactobacillus casei
The polypeptide chain of the allosteric L-lactate dehydrogenase (EC 1.1.1.27) of Lactobacillus casei consists of 325 amino acid residues. Despite the strikingly different enzymatic characteristics of the allosteric L-lactate dehydrogenase of L. casei and of the non-allosteric vertebrate enzymes, the sequence of the al…
Localized volume deficiencies as an effect of spherulite growth. II. The three‐dimensional case
Abstract As in the two‐dimensional case, the density change due to crystallization leads to a buildup of internal strain in some regions of a polymer melt occluded by growing spherulites. The occluded parts of the sample are called “weak spots.” Computer simulation of spherulite growth in bulk samples shows that the l…
Crystalline structure of sarcoplasmic reticulum from scallop.
Negatively stained sarcoplasmic reticulum from the scallop Placopecten magellanicus presented a variety of crystalline forms, the most common being tubular structures. These were characterized by paired rows of morphological units, spaced at approximately 120 A, running diagonally across the tubules. The orthogonal un…
Crystal structure of Bis(2,2':6',2''-terpyridyl)cobalt(II) perchlorate c. 1.3 hydrate
The crystal structure of the title compound, [CO(C15H11N3)2](ClO4)2.c. 1.3H2O has been determined by single crystal X-ray diffraction methods at 295 K. The structure is described in terms of atetragonal P 42/ n sub-lattice structure similar to that of [Co(terpy)2]I2.2H2O, with a 8.86(1), c 20.19(2) Å. Perchlorate orie…
New polymer synthesis. IX. Synthesis of poly(ether sulfone)s from silylated diphenols or hydroxybenzoic acids
Abstract The condensation polymerizations of bis(4‐flurophenyl) sulfone with the bistrimethylsilyl derivates of bisphenol‐A, 4,4′‐dihydroxydiphenyl sulfone, 1,5′‐dihydroxynaphthalene, 3‐hydroxybenzoic acid, and 4‐hydroxybenzoic acid were investigated. These polycondensations were only successful when potassium or cesi…
Densities and partial molar volumes of supercooled aqueous solutions
Density measurements of aqueous solutions of ethanol, t-butanol, and hydrazine in the temperature range from 50 °C down to nucleation are presented. From these data, solute partial molar volumes and temperatures of maximum density are determined. The partial molar volumes of the alcohol solutions at low concentration…
On the application of fourier transform infrared spectroscopy to the elucidation of specific interactions in miscible polyester‐poly(vinyl chloride) blends
Abstract FT‐IR spectroscopic studies have been performed in an attempt to elucidate the nature of the specific interactions occurring in miscible poly(ϵ‐caprolactone) (PCL)‐poly (vinyl chloride) (PVC) blends. Studies of low molecular weight analogues, polymer/solvent mixtures and blends of PCL and α‐deuterated PVC are…
Fire- and heat-resistant laminating resins based on maleimido-substituted aromatic cyclotriphosphazenes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFire- and heat-resistant laminating resins based on maleimido-substituted aromatic cyclotriphosphazenesDevendra Kumar, George M. Fohlen, and John A. ParkerCite this: Macromolecules 1983, 16, 8, 1250–1257Publication Date (Print):August 1, 1983Publication History Published onl…
Use of diffraction and Mössbauer methods for the structural and crystallochemical characterization of nontronites
The aim of this work is the study of the order-disorder distribution of the Fe3+ cations in a dioctahedral smectite: the Garfield nontronite. The structural characteristics have been determined by selected-area electron diffraction, oblique texture electron diffraction and X-ray diffraction. These methods lead to the…
Interaction of (phthalocyaninato)iron(II) with molecular oxygen: synthesis and characterization of two different crystalline forms of (.mu.-oxo)bis[(phthalocyaninato)iron(III)]
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of (phthalocyaninato)iron(II) with molecular oxygen: synthesis and characterization of two different crystalline forms of (.mu.-oxo)bis[(phthalocyaninato)iron(III)]C. Ercolani, M. Gardini, F. Monacelli, G. Pennesi, and G. RossiCite this: Inorg. Chem. 1983, 22, 18…
The high temperature liquid and glass heat contents and the heats of fusion of diopside, albite, sanidine and nepheline
Relative enthalpy, and heat capacities of CaMgSi 2 O 6 (Di) stable liquid and glass; of KAlSi 3 O 8 (Sa) stable and supercooled liquid and glass; of NaAlSi 3 O 8 (Ab) liquid derived directly by melting solid albite; of crystalline, disordered albite itself; and of NaAlSiO 4 (Ne) liquid and glass. The effect of anneali…
Polymorphism and superconductivity of LaIr2Si2
La${\mathrm{Ir}}_{2}$${\mathrm{Si}}_{2}$ has a high-temperature form crystallizing in the primitive tetragonal Ca${\mathrm{Be}}_{2}$${\mathrm{Ge}}_{2}$-type structure (space group $\frac{P4}{\mathrm{nmm}}$; $a=4.191$ \AA{}, $c=9.944$ \AA{}), and a low-temperature form of the body-centered tetragonal Th${\mathrm{Cr}}_{…
EXAFS structure and magnetic properties of a CuIINiII .mu.-oxalato mixed linear chain
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEXAFS structure and magnetic properties of a CuIINiII .mu.-oxalato mixed linear chainMichel Verdaguer, Miguel Julve, Alain Michalowicz, and Olivier KahnCite this: Inorg. Chem. 1983, 22, 18, 2624–2629Publication Date (Print):August 1, 1983Publication History Published online1…
Thermotropic polyesters. 2. Investigation of the mesophase properties of polymers based on 4,4'-dihydroxybiphenyl
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermotropic polyesters. 2. Investigation of the mesophase properties of polymers based on 4,4'-dihydroxybiphenylW. R. Krigbaum, J. Watanabe, and T. IshikawaCite this: Macromolecules 1983, 16, 8, 1271–1279Publication Date (Print):August 1, 1983Publication History Published o…