Materials Literature
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Castor oil was polymerized and crosslinked with sulfur or diisocyanates to form the vulcanized and urethane derivatives, respectively. Both types were swollen with a plastic-forming monomer plus crosslinker, and a second polymerization was carried out in situ. Polyblends were also made by emulsion polymerization of st…
Coatings of Al/sub 2/O/sub 3/ up to 12 mil thick were deposited on Al anodes from aqueous solutions of NaAlO/sub 2/ by anodic spark deposition. Although the applied potential ranged from 415 to 540V dc, >97 percent of the potential drop occurred within 2.8 x 10/sup 4/ A/cm/sup 2/. The lifetime of a single spark was ap…
Abstract The differential scanning calorimetry (DSC) melting curves of drawn nylon 6 were studied from the standpoint of reorganization of the crystals during the heating process. A new method was presented to obtain the DSC curve associated with the growth and melting of the original crystals, and that with the recry…
Abstract The transformation of sodium and potassium smectite into mixed-layer clay was followed in hydrothermal kinetic experiments. Glasses of beidellite composition and the Wyoming bentonite were used as starting materials. Temperatures ranged between 260 and 490°C at 2 kbar pressure, and run times ranged between 6…
Samples from Takovo, Serbia (the type locality); Perseverance Mine, Agnew, Australia; and Var, France, were examined by X-ray powder diffraction, infrared and optical absorption spectroscopy, and thermogravimetric and chemical analysis. X-ray powder data are indexed with a hexagonal unit cell, and for the Takovo sampl…
Abstract and Summary Photosensitized oxidation of unsaturated fatty acid methyl ester was carried out using methylene blue as a sensitizer. Oxidation products, monohydro‐peroxides, were identified as trimethylsilyl derivatives. Methyl oleate gave the 9‐ and 10‐isomers; methyl linoleate, the 9‐, 10‐, 12‐, and 13‐isomer…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of superoxide ion during the decomposition of hydrogen peroxide on supported metalsYoshio Ono, Tsuyoshi Matsumura, Nobumasa Kitajima, and Shunichi FukuzumiCite this: J. Phys. Chem. 1977, 81, 13, 1307–1311Publication Date (Print):June 1, 1977Publication History Publ…
ABSTRACT The Pleistocene Miami Limestone that crops out on the lower Florida Keys is overlain by thin (16 cm or less), discontinuous, Holocene calcareous crusts (caliche) that are usually laminated, composed dominantly of calcite micrite and may or may not incorporate part of the underlying limestone. Both allochems a…
When there are several equivalent atomic sites over which a core hole may be delocalized the question arises whether the core hole should be thought of as localized or delocalized. The problem is analyzed in terms of relaxation and correlation effects using the Green’s function approach. It is shown that the relaxatio…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIntroduction, modification, and characterization of functional groups on the surface of low-density polyethylene filmJames R. Rasmussen, Erwin R. Stedronsky, and George M. WhitesidesCite this: J. Am. Chem. Soc. 1977, 99, 14, 4736–4745Publication Date (Print):June 1, 1977Publ…
The effect of pressure on the fluorescence of ${\mathrm{Eu}}^{3+}$ ions in Europium pentaphosphate (Eu${\mathrm{P}}_{5}$${\mathrm{O}}_{14}$) was measured up to 400 kbar. We observed a pressure induced "antilevel crossing" of the crystal-field levels within the $^{7}F_{1}$ manifold and a decrease of the spin-orbit and…
The configurational entropy theory of glass formation is used to derive the composition dependence of the glass transition temperature (Tg) and of supercooled liquid transport properties for binary mixtures which obey the laws of regular solutions. The relations between expressions derived subject to specified approxi…
The influence of high external stress (τ ≤ 340 N/mm2 on the dissociation of dislocations in silicon has been investigated. At 420°C the dislocations are strictly parallel to 〈110〉 directions. From the orientation of the compression axis a reduction in the dissociation width is to be expected. We have found screw dislo…
A new apparatus for reflection high energy electron diffraction (RHEED) provided with an electron gun with a sharply focused electron beam and operated under ultrahigh vacuum condition has been constructed. It has a specially devised fluorescent screen which enables us to take new type RHEED patterns corresponding to…
A nuclear framework structure termed the nuclear matrix has been isolated and characterized. This matrix forms the major residual structure of isolated nuclei and consists largely of protein with smaller amounts of RNA, DNA, carbohydrate, and phospholipid. The nuclear matrix can be further resolved by combined treatme…
The mechanism of field‐assisted pore formation in 15% wt aqueous solutions was studied by O 18 tracing techniques. Compact base layers were first formed in an O 18 labeled solution and further oxidized in a nonlabeled solution, leading to field‐assisted pore formation. The O 18 content and depth distribution was measu…
The crystal structure of a polysaccharide can be obtained by first determining the crystal structures of its oligosaccharide single crystals. By extrapolation and comparison with the fiber diagram, the structure of the polysaccharide is obtained. This is the classical approach for polymer structures and some efforts a…
(Most chapters end with References and Problems). 1. Nuclear Engineering. 2. Atomic and Nuclear Physics. Fundamental Particles. Atomic and Nuclear Structure. Atomic and Molecular Weight. Atomic and Nuclear Radii. Mass and Energy. Particle Wavelengths. Excited States and Radiation. Nuclear Stability and Radioactive Dec…
Results obtained on the polymerisation, copolymerisation, and graft copolymerisation of vinyl fluoride, various properties of the polymers thus produced, and also possible fields of application are discussed on the basis of 435 references published up to the beginning of 1976.
CONTENTS 1. Introduction 432 2. The Electronic State of Adsorbed Atoms 432 3. Interaction of Adsorbed Particles. Dependence of Heat of Adsorption and Work Function on Concentration of Adatoms 437 4. Atomic Structure of Submonolayer Films and Phase Transitions in Them 441 5. Conclusion 448 References 449