Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis and Macromolecular Helicity Induction of a Stereoregular Polyacetylene Bearing a Carboxy Group with Natural Amino Acids in WaterMitsuo Albert Saito, Katsuhiro Maeda, Hisanari Onouchi, and Eiji YashimaView Author Informatio…
Elastic moduli and dislocation core energy of the triangular solid of hard disks of diameter sigma are obtained in the limit of vanishing dislocation-antidislocation pair density, from Monte Carlo simulations that incorporate a constraint, namely that all moves altering the local connectivity away from that of the ide…
The hyperbranched polystyrenes are prepared by the self-addition free radical vinyl polymerization of N,N-diethylaminodithiocarbamoylmethylstyrene (DTCS). DTCS monomers play an important role in this polymerization system as an inimer that is capable of initiating living radical polymerization of the vinyl group. The…
Specimens of the form ${\mathrm{Ca}}_{1\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{MnO}}_{3}$ $(0<~x<~0.2)$ are utilized to study the effect of electron doping on the magnetic saturation moment ${M}_{\mathrm{sat}}(5\mathrm{K}).$ The systematic behavior of ${M}_{\mathrm{sat}}(5\mathrm{K})$ vs x is understood throug…
Because of the elastic anisotropy, stresses determined from diffraction methods like X-ray or neutron diffraction can not be determined better than 10% or 20% irrespective of the model which is used for the calculation of the X-ray elastic constants (Voigt, Reuss, Kröner). A reliable stress determination through Hooke…
Functionalizing the termini of low-molecular-weight telechelic polymers with strongly associating hydrogen bonding units (see Figure) results in a new set of supramolecular materials, as reported here. These materials possess the unique combination of polymer-like properties at room temperature and monomer-like proper…
The current state of the set of problems associated with the study and application of the pyroelectric effect at low ( T <30 K) temperatures is outlined. The reasons for the qualitatively different temperature dependences of the total pyroelectric coefficient γ σ ( T ) in linear pyroelectrics and ferroelectrics are di…
Abstract Pinking of TiO 2 ‐pigmented PVC can be observed for profiles exposed to the mild environmental conditions of Northern European countries. In this paper, the pinking phenomenon is accounted for at the molecular level by the formation of polyene sequences which are not completely photooxidatively bleached under…
Farmers in the lower corn belt region of the United States need to know how to fertilize soils in order to optimize the efficiency of potassium (K) use by plants under different tillage systems and with high yield management. A field study was conducted from 1994 to 1996 at the Dixon Springs Agricultural Center (DSAC)…
The thermal degradation of the acrylonitrile−butadiene−styrene copolymer (ABS) was carried out at different temperatures from 360 to 440 °C in static and dynamic atmospheres of nitrogen, using semibatch operation. Nitrogen-containing compounds were found in all three degradation fractions: gases (as NH 3 and HCN), oil…
The unique optical properties of Se2- radicals located in the cages of the sodalite structure are reported. By means of luminescence, photoluminescence excitation, and absorption spectroscopy, three different centers are identified. Two of them are Se2- anions in sites with presumably a tetrahedral Na4(4+) coordinatio…
The Mitsunobu reaction is shown to be a versatile method for the incorporation of pyromellitic diimide (PMDI) acceptors into new macrocyclic structures containing tetrathiafulvalene (TTF) donors. In the case of macrocycle 5, the more efficient bis-pyrroloTTF donor was used instead of TTF. Macrocycle 1 revealed distinc…
Outlines for increased insulation performance of an air gap through the use of dielectric coatings are given. Theoretically, it is shown that the homogeneous electric field in a plane-parallel electrode system can be reduced if the electrodes are covered with a thick dielectric coating. Free charges will be affected b…
A thin hydrogel possessing layer-by-layer structure was prepared on substrates from a stabilized reactive micelle from a poly(ethylene glycol)−poly( d, l -lactide) (PEG−PLA) bearing an acetal group at the PEG end and a methacryloyl group at the PLA end. The hydrogel layer was formed by coating the aminated surfaces wi…
The crystal structures of Bi24O31X10 (X = Cl, Br; 24-bismuth 31-oxide decachloride/-bromide) have been redetermined. The structure models obtained resemble the model described in the literature about 60 years ago, but differ from it in some details of the O substructure and in the fact that the structure for X = Cl is…
Pellets of lubricated and fully biodegradable thermoplastic wheat starch formulations were produced by extrusion. The lubricants used were a vegetable oil or an internal biodegradable release agent such as magnesium stearate. After being conditioned for one week at 20 °C at 65% of relative humidity, (HR), the pellets…
Management of long-lived radioactive nuclear waste implies understanding its structural behavior when subjected to irradiation. This paper presents molecular-dynamics simulations about the effect of a recoil nucleus on a simplified nuclear glass containing ${\mathrm{SiO}}_{2},$ ${\mathrm{B}}_{2}{\mathrm{O}}_{3},$ ${\m…
Abstract Experimental alteration of volcanic tuff from Almeria, southeastern Spain, was performed in solutions with different Na/K ratios (0.01, 1, 10, and 100), different total salt concentrations (0.01, 0.1, 0.2, 0.33, and 1 M), and in deionized water, at 60, 80, 120, and 160°C, for periods of 60, 90, 180, and 360 d…
The semicrystalline morphology of melt-miscible poly( l -lactide) (PLLA)/poly(4-vinylphenol) (PVPh) blends was probed by small-angle X-ray scattering (SAXS) with the measurement of absolute intensity. Blending with PVPh enhanced the SAXS intensity associated with the lamellar stacks. This was attributed to the presenc…
Magnesium alloys have a high potential for reducing mass in automotive and aerospace applications due to their extraordinary low density. However, their utilization is often restricted since magnesium suffers from several material inherent deficiencies like low stiffness, poor high temperature strength, low wear and c…