Materials Literature
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The lattice heating effect on the kinetics of attaining the steady state of hot carrier thermoelectric power in a p-n junction is theoretically studied. It is shown that lattice heating leads to an additional third stage in the process of attaining the steady state in thermal currents and the thermoelectric power of h…
A macroscopic theory for the dynamics of compressible nematic polymer-viscous fluid interfaces is developed from first principles. The theory is used to define and characterize the basic interfacial viscoelastic material properties of the ordered interfaces. The theory is based on a decomposition of the kinematic fiel…
Abstract This paper demonstrates that the carbon—silica dual phase fillers are comprised of aggregates containing both carbon and silica phases. The silica is shown to be finely distributed among the carbon phases within the aggregates and within the particles of the dual phase aggregates. Analysis of the silicon cont…
Abstract An experimental analysis of hysteresis loss, hysteresis loss ratio and input energy of natural rubber (NR) and styrene-butadiene rubber (SBR) vulcanizates having variations of loading of carbon black, precipitated silica and clay has been carried out under uniaxial, pure shear and constrained extension modes…
Abstract Alkoxysilanes can be grafted onto an ethylene homopolymer or copolymer to give a moisture crosslinkable polymer. Moisture crosslinking has many benefits over peroxide‐ or irradiation‐induced crosslinking. Simple, conventional equipment allows processing with lower capital investment and less manufacturing spa…
Abstract Phase transfer catalyst coatings have been developed that increase the stabilization effectiveness of acid absorbers such as hydrotalcite and Type A zeolite in combination with lead stabilizers, and also with organotin stabilizers having structures that previously did not provide synergistic effects with acid…
A theoretical model taking into account the photoisomerization influence on the nematic scalar order parameter is presented. An extension of the Maier-Saupe model is used to investigate the concentration dependence of the scalar order parameter. The evolution of the concentration of cis-trans isomers and of the scalar…
Eight types of low-activation concrete have been developed and some types of low-activation reinforcement have been selected. These materials have been irradiated by thermal neutron with some reference materials. The induced activities have been measured with a Ge detector and a liquid scintillation detector. Based on…
Abstract Solid state characterization of poly(L‐lysine)hydrobromide was obtained via differential scanning calorimetry, thermogravimetric analysis, optical microscopy and infrared spectroscopy. The glass transition temperature of poly(L‐lysine)hydrobromide is 178°C. This thermal transition has not been reported previo…
Our initial paper reported that the catalytic epoxidation of p-methoxystyrene by the Mn(TPP)Cl/LiOCl system in a biphasic medium CH 2 Cl 2 /H 2 18 O produced the expected epoxide with less than 5% of 18 O incorporation.More recently we described the partial incorporation of oxygen atom from labeled water within olefin…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTEffect of Polymer Adsorption on the Surface Tension and Flocculation of Colloidal Particles in Incompatible SolventsNily DanView Author Information Department of Chemical Engineering, Drexel University, Philadelphia, Pennsylvania 19104 Cite this: Langmuir 2000, 16, 8, 4045–4048…
Abstract The odd electron in the δRhRh* orbital of (3,1)-[Rh2(mhq)4py]+ (1+; Hmhq = 4-methyl-2-quinolinol) was estimated to be delocalized onto each π system of the four mhq bridges to the extent of ca. 9% based on its 1H NMR paramagnetic shifts. The experimental spin distribution in the mhq ligands is consistent with…
Abstract Polymer solidification under processing conditions is a complex phenomenon in which the kinetics of flow, high thermal gradients and high pressures determine the product morphology. The study of polymer structure formed under pressure has been mainly made using conventional techniques such as dilatometry and…
The resistivity behaviour of high porosity nickel foam as a function of porosity has been investigated experimentally. The results were compared with a number of empirical and theoretical models. It was found that a new model based on structural properties gave the closest fit to the experimental data. This provides a…
Abstract— Optical alignment and micro‐patterning of the alignment of liquid‐crystal displays (LCDs) by linear photopolymerization (LPP) technology renders high‐quality multi‐domain twisted‐nematic (TN) and supertwisted‐nematic (STN) displays with broad fields of view over wide temperature ranges feasible. The prerequi…
The foci or branch points are found for a sinusoidal boundary. It is shown how they determine the range of validity of Rayleigh's hypothesis for diffraction gratings.
In the process of fabric spreading, the variance of fabric yardage between fabric rolls may lead to a difference in fabric loss during spreading. As there are numerous combinations the arrangement of the fabric roll sequences for each cutting lay, it is difficult to construct a roll planning to minimise the fabric was…
The thermal decomposition of a freeze dried Ni-Fe-μ-oxo-acetate results in the formation of an amorphous nickel ferrite. Crystallization of the spinel NiFe2O4 takes place between 300 and 500°C. High disperse amorphous (or less crystalline) products with specific surfaces up to 500 m2/g can be obtained by carful decomp…
Nd(S2O7)(HSO4): The First Disulfate of a Rare Earth Element Light violett single crystals of Nd(S2O7)(HSO4) have been obtained by the reaction of Nd2O3 and oleum (30% SO3) at 200 °C in sealed glass ampoules. The crystal structure (monoclinic, P21/n, Z = 4, a = 857.8(1), b = 1061.0(2), c = 972.4(1) pm, β = 99.33(2)°) c…
Abstract Crystallization behavior of natural rubbers of different clonal origins, i.e., RRIM 600, 60/2, 2025, 2026, and skim rubbers, was investigated by dilatometry at −25 °C. The latex samples were deproteinized with a proteolytic enzyme in the presence of surfactant. Skim rubbers were purified by centrifugation fol…