Materials Literature
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Crosslinked polyacrylamide gels formed by copolymerisation of acrylamide and N,N′-methylenebisacrylamide in aqueous solution have been characterised by viscoelastic measurements in the frequency range 0.05–150 Hz. These data are consistent with the model, derived from permeability data, of a non-draining central core…
This paper describes preliminary pyroelectric and piezoelectric results obtained with commercial films of nylon 11. The results of dielectric-constant measurements in the temperature range 20–130 °C are also presented. Nylon 11 films show quite high pyroelectricity and the evidence indicates that there is probably dip…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn approximate expression of the electrostatic molecular potential in terms of completely transferable group contributionsRosanna Bonaccorsi, Eolo Scrocco, and Jacopo TomasiCite this: J. Am. Chem. Soc. 1977, 99, 14, 4546–4554Publication Date (Print):June 1, 1977Publication H…
Advantages in using the pyrophosphate complex of trivalent managanese over the sulfate complex as initiator for graft copolymerization onto starch are discussed. The first successful attempts to graft copolymerize acrylonitrile, methyl methacrylate, and acrylamide to starch and starch derivatives are described using m…
A computer simulation of the insulator surface charging in vacuum under the application of a high voltage, is presented for alumina (A1203) insulator and for alumina insulators coated with cuprous oxide (Cu2O) and chromium oxide (Cr2O3). It is shown that the mode of surface charge distribution is dependent on the seco…
We have determined the amounts of a number of small molecules and enzymes in the mother cell compartment and the developing forespore during sporulation of Bacillus megaterium. Significant amounts of adenosine 5'-triphosphate and reduced nicotinamide adenine dinucleotide were present in the forespore compartment befor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of the catalytic site of polymer-bound Wilkinson's catalyst by x-ray absorption studiesJoseph Reed, P. Eisenberger, Boon-Keng Teo, and B. M. KincaidCite this: J. Am. Chem. Soc. 1977, 99, 15, 5217–5218Publication Date (Print):June 1, 1977Publication History Publishe…
Abstract Nine synthetic Na-saponites with charge densities varying between 0.33 and 1.0 have been prepared. Their swelling properties and structural organization in water, ethylene glycol and glycerol show discontinuities in the physico-chemical behaviour of these samples. The layer charge densities caused changes in…
Abstract The collagen of bovine striated muscle has been shown to be comprised of three genetically distinct types of collagen, the proportions of which vary from the tendon to the endomysium. Despite the variation in genetic type all three collagens are stabilised by lysine‐derived cross‐links. It is proposed that th…
Abstract The equivalent dipole model of the ring current shift in benzene is shown to be equivalent to that of the well‐known two current loop calculation. A network model of the ring current effect in the porphyrin system is described, using the double–dipole approximation, to give a calculation of the ring current s…
We report measurements of the hydrogen concentrations and densities of amorphous silicon films prepared from glow discharge plasmas of silane. Quantitative results are obtained from the resonant nuclear reaction 15N+1H→12C+4He+γ by counting the emitted γ rays. Mass spectrographic analysis of the gases evolved upon hea…
A Fortran minicomputer program for the collection of X-ray diffraction data from protein crystals is described. Data collection efficiency has been achieved by means of: ω step scans for reflection intensity, radial step scan along 2θ to estimate background intensity and preselected reflection files. The program inclu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe integral representation of the relaxation effects in mixed strong electrolytes in the limiting law regionShoon K. Kim and Lars OnsagerCite this: J. Phys. Chem. 1977, 81, 12, 1211–1212Publication Date (Print):June 1, 1977Publication History Published online1 May 2002Publi…
The electron-microscopic visualization of acrylic rubber dispersed in a heterogeneous structural resin composition consisting of a rubber-modified two-phase plastic comprising essentially a butyl acrylate rubber phase and an acrylonitrile–styrene copolymer phase, respectively, has been accomplished. This procedure con…
Summary The factors relating to the development of fenestration of the vertical‐lateral plate of the maximillary bone in the rabbit was studied by ontogenetic, comparative, phylogenetic and experimental materials. Normal developmental sequences showed that the trabecular bone pattern of the vertical plate is produced…
The microstructure of fibers is important to textile performance properties, but it is the pore structure and surfaces of pores that are critical to moisture regain, imbibed water, and the modification of fibers with finishes that must enter fibers in order to perform their function. In the case of cellulosic fibers,…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
Abstract not Available.
Measurements of rotational viscosity in the various liquid crystalline phases of TBBA (terephthal-bisbutylaniline) are reported. The quantity measured is the viscous energy dissipation in the liquid crystal as it oscillates in a magnetic field. This dissipation varies greatly in the different smectic phases. It is sma…
Abstract Darstellung und Kristallaufbau für das kupferrote Rubidiumsuboxid Rb 9 O 2 werden beschrieben. Die Verbindung besteht aus Ionengruppen der gleichen Zusammensetzung, die metallisch aneinander gebunden sind. Durch Vergleich der Röntgendaten wird nachgewiesen, daß der Hauptanteil des mehrfach als „Rb 3 O”︁ besch…