Materials Literature
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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…
Crystallization analysis fractionation (CRYSTAF) is a new technique for the analysis of the composition of polyolefin blends. CRYSTAF fractionates blend components of different crystallizability by slow cooling of a polymer solution. During the crystallization step the concentration of the polymer solution is monitore…
The main aim of this paper is to describe the state of the art and the key problems of the selective synthesis of phthalocyanines and related compounds. This non-exhaustive overview comments on the synthesis of isomerically pure, unsymmetrically substituted and non-centrosymmetric phthalocyanines as well as intrinsica…
A two‐dimensional numerical model that predicts the reliability of multilayer capacitors (MLCs) during soldering and bending is presented. The Weibull parameters used in the model are based on measurements of soldered MLC devices. The preheating and soldering temperatures have a dominant impact on the failure probabil…
Abstract The molecular weight distribution (MWD) of commercial suspension grade poly(vinyl chloride) (PVC) resins with K values from 50 to 93 and mass grade PVC resins with K values from 58 to 68 has been determined by size exclusion chromatography (SEC), using literature Mark‐Houwink coefficients. The MWD is characte…
The dynamic thermal and mechanical behavior of Polypropylene/Mica composites—with improved properties induced by the presence of succinil-fluoresceine groups onto atactic polypropylene with different grafting levels—is the subject of this article. A further correlation of these with the macroscopic mechanical performa…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTSequential Cationic and Anionic Polymerizations by Triflate Complexes of Bulky Titanium Bisphenolates: One-Pot Synthesis of Polyoxetane−Poly(ε-caprolactone) Block CopolymerDaisuke Takeuchi and Takuzo AidaView Author Information Departme…
The viscoelastic properties and stabilities of those properties of organic hybrids consisting of chlorinated polyethylene (CPE) and tetrakis[methylene-3-(3-5-di-tert-butyl-4-hydroxy phenyl)propionyloxy]methane (AO-60) and triethylene glycol bis[3-(3-tert-butyl-4-hydroxy-5-methyl phenyl)propionyloxy] (AO-70) were inves…
Abstract A series of smectites was investigated to reveal the thickness distribution of crystallites. The Fourier decomposition technique of Bertaut-Warren-Averbach (MudMaster program) was applied to XRD reflections of <0.2 μm, glycolated Na-clays. It was shown that the thickness distribution is lognormal and the m…
We have studied the c-axis and the in-plane infrared response of the anisotropic crystals of ${\mathrm{LaSrGaO}}_{4}$ and ${\mathrm{LaSrAlO}}_{4}.$ We identify both transverse and longitudinal phonons. The lattice bands show pronounced features of mode coupling, which we attribute to the random distribution of La and…