Materials Literature
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Abstract Seven samples of montmorillonite from Belle Fourche, South Dakota and one from Clay Spur, Wyoming were equilibrated with various solutions for 3 to 4 years. Most samples did not exhibit a static equilibrium, yet solution compositions moved along or toward definite solubility lines in relation to pH‐⅓ pAl 3+ v…
Abstract Analysis of the kinetics of hydrolytic desorption of chemisorbed C‐14 labelled polymeric APS (gamma‐aminopropyltriethoxysilane, a coupling agent for glass reinforced epoxy resins) from flat silica or borosilicate surfaces, indicated that the polymer probably consisted of short chains each chemisorbed at one e…
各種組成のエチレンー酢酸ビニル共重合体 (EVAc) をアルカリケン化することにより得られるエチレンービニルァルコール共重合体 (EVA) の物性と構造をX線的に研究し, 次の結果を得た。(1) EVAcは酢酸ビニル含有量約20mol%以上で非晶性となるが, EVAは全組成領域にわたり結晶性である。(2) EVA試料の比重は結晶化度にはほとんど依存せず, 共重合組成とほぼ直線関係にある。(3) EVAの融点はビニルアルコール含有量20mol%付近に極小をもつ連続的曲線で表わされ, 非晶性コモノマーのランダム共重合体に関するFloryの式には従わない。(4) X線的に求めた結晶の形態学的パラメーターから, EVAの結晶構造は三つに大…
Potentiodynamic polarization curves in 1 N H 2 SO 4 and in 1 N HCl were obtained for 25% Cr ferritic stainless steels containing 0–5% Mo and 0–4% Ni. High‐purity alloys and alloys containing the usual commercial levels of C,N, Si, and Mn were investigated. The critical current density was decreased by molybdenum and m…
The crystal structure of [Fe(salen)]2O, CH2Cl2 has been determined by three-dimensional X-ray methods. The crystals are monoclinic, space group P21/c, with Z= 4, and cell dimensions a= 12·44, b= 14·11, c= 19·83 Å and β= 110·4°. Atomic co-ordinates were obtained by Fourier methods and refined by full-matrix least-squar…
The current review of spectroscopic studies in the glassy state concludes in this part with the consideration of wavelengths in the infrared region and below, Of all the spectral regions, the infrared is the most extensively studied, as can be readily seen from a statistical appraisal of interest, a s judged from the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntramolecular environmental effects on the bonding of cyanide and carbonylRichard F. Fenske, Roger L. DeKock, and Allen C. SarapuCite this: Inorg. Chem. 1971, 10, 1, 38–43Publication Date (Print):January 1, 1971Publication History Published online1 May 2002Published inissue…
Abstract X‐ray, differential scanning calorimeter, and density measurements of the degree of crystallinity have been made on ethylene—propylene copolymers which range in composition from 60 to 100 mole‐% ethylene. At 23°C the degree of crystallinity was found to vary from zero to approximately 75 wt‐% in a regular man…
A scanning electron microscope study of oxide replicas of aluminum electrolytic capacitor foils has provided information on tunneling produced by a given etch. Tunnel morphology depends on microstructure of the aluminum and on etching conditions. With increasing current density in an electrochemical etch, the number o…
The structures of Hg2F2, Hg2Cl2, and Hg2Br2 have been reinvestigated on the basis of single crystal data; the intermetallic distances differ from those earlier reported and show no correlation with the electronegativity of the halogen.
Abstract Synergism in poly(vinyl chloride) stabilization has been studied by measuring rates of hydrogen chloride evolution from samples of polymer in the presence of stabilizers in di‐(2‐ethylhexyl) phthalate solution in an inert atmosphere. Barium, cadmium, calcium, and zinc laurates, when used alone, allow escape o…
Abstract The forces of repulsion generated in the steric barriers of a series of monodisperse spherical polymer particles, varying in diameter, have been measured using a surface balance. The particles were stabilized using a graft copolymer with a poly(methyl methacrylate) backbone and heptane soluble poly(12 hydroxy…
The crystal and molecular structure of bis-phthalocyaninatouranium(IV), the first complex of an actinide element with the phthalocyaninato-ion, has been determined by X-ray diffraction analysis.
The oxygen growth laws of anodic oxide films on aluminum and tantalum were studied using the nuclear microanalysis of the O 16 and O 18 isotopes. The influence of current density and surface preparation on the growth laws has been demonstrated. The correlation of the results of nuclear microanalysis of O 16 and of cou…
ABSTRACT The protein in the oothecal glands of praying mantids (Sphodromantis tenuidentata, Mio mantis monacha) exists in the form of lamellar liquid crystalline spherulites, which coalesce asthey flow out of a punctured gland tubule. Electron micrographs of sections of these spherulites after fixation show parabolic…
The liquid crystalline properties of several series of phenyl, ω-phenylalkyl and branched chain alkyl esters of 4-p-substituted-benzylideneaminocinnamic acids have been examined by optical microscopy and differential thermal analysis. The incidence of smectic polymorphism in these esters is high. Three distinct smecti…
Murine amyloid has been produced by four different induction methods ( Mycobacterium butyricum, casein, casein plus Freund's adjuvant and endotoxin-induced mouse amyloidosis) in several strains and obtained from mice with "spontaneous" amyloidosis. The amyloid fibrils have been concentrated from spleen and liver. Elec…
Conference International Symposium on the Chemistry of Natural Products, International Symposium on the Chemistry of Natural Products, ISCNP, Natural Products, VIIth, Riga, USSR, 1970-06-21–1970-06-27 Published Online: 2009-01-01 Published in Print: 1971-01-01 © 2013 Walter de Gruyter GmbH, Berlin/Boston
Abstract not Available.
Abstract Previous theories valid for polymer chains with large loops protruding into the solvent are developed. Interaction in various layers parallel to the interface is calculated according to the Flory‐Huggins theory. Excluded volume effects are shown to be so small that they can be neglected. The adsorption isothe…