Materials Literature
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The use of polymers for under-the-hood automobile parts is growing rapidly. During driving, these parts are exposed to a wide range of potentially harmful conditions, including high temperatures and corrosive chemicals. Such exposure conditions can cause changes in a polymer that might affect its long-term performance…
The initiation of electrochemical reductive degradation (ECRD) of polyvinylchloride (PVC) by the active products of electrochemical reduction of dimethylformamide (DMF) and acetonitrile (MeCN) has been investigated. It was determined that ECRD leads to dehydro-chlorination of PVC and brings into appearance polyconjuga…
Abstract Optically active dihydrobenzofurans and dihydrofuropyridines were synthesized and shown to be good chiral dopants for ferroelectric liquid crystals.
The reaction product of with aniline in water was subjected to various analyses before and after its discharge and charge to determine its physical state and electrochemical reactions. From these analyses, it can be seen that there are two possible states for the reaction product before the discharge; one is a mixture…
Abstract— Liquid‐crystal molecules on a rubbed‐polymer alignment layer are oriented at a polar angle tilted away from the surface, but the physical reason for this pretilt is not clearly understood. We have developed a new method to determine the three‐dimensionally tilted direction of the polymer by precise measureme…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT13C CP/MAS NMR Analysis of Isotactic Poly(3-methyl-1-butene)Anna Borriello, Vincenzo Busico, Claudio DeRosa, and Dirk SchulzeCite this: Macromolecules 1995, 28, 16, 5679–5680Publication Date (Print):July 1, 1995Publication History Published online1 May 2002Published inissue…
Abstract We use conformal mapping techniques to derive the quasianalytical formulas for calculating the effective dielectric constants of coplunar lines on LiNbO 3 substrates having a buffer layer. Our calculations agree well with the results obtained using the point‐matching method. © 1995 John Wiley & Sons, Inc.
Abstract This review of the current status of conducting polymers will focus on recent progress which demonstrates that the initial promise of the late 1970's has become reality. Conducting polymers are now available as materials with truly unique properties: They combine the important electronic and optical propertie…
Thrombogenesis is considered the principal cause of early failure of arterial grafts. Although antithrombotic drugs are recommended, their efficiency under low blood flow conditions is still being debated. In this study, we evaluated the ability of three drugs to modify the thrombotic properties of blood and, conseque…
The recent measurements of thermal conductivity of diamond are explained by the two-step model of normal process. The phonon scattering of isotopic defects is used as a main variable to fit the measurements. The enhancement of thermal conductivity at 300 K by reduction of the isotope concentration from 1.1% to 0.07% i…
It is proposed that a size scale may be introduced into a crystal plasticity model by including the energy associated with boundaries between adjacent crystal segments. A finite element model is developed where the crystal behavior is governed by a crystal plasticity model and the boundary energy between neighboring e…
Macroscopic tensorial physical properties that are different in two domains of a ferroic crystal provide a tensor distinction of the two domains. This tensor distinction is determined from a symmetry relationship, called a twin law, between the bulk structures, the domain states, of the two domains. The simplest type…
A low cost processing technique called reaction forming for the fabrication of near-net and complex shaped components of silicon carbide based ceramics and composites is presented. This process consists of the production of a microporous carbon preform and subsequent infiltration with liquid silicon or silicon-refract…
A highly unusual electric response of the dislocations and the impurity dipoles in KNbO3 single crystals has been found. The etch pits representing these defects move in the structure carrying these defects with them. This shows that the defects have associated with them structural units that are orders of magnitude l…
Good yield synthesis of the potassium salts of four new interrelated : olyoxometalates, [Co3+W11O39]9-(I), [Co2+W11V4+O4]8-(II), [Co2+W11V5+O40]7-(III), and [Co3+W11V5+O40]6-(IV), are reported. The title compounds have been characterized by IR and UV-Vis.-NIR spectroscopies, cyclic voltammetry and magnetic measurement…
<div class="htmlview paragraph">When oxygen for propulsion and life support needs is extracted from Martian resources, significant savings in launch mass and costs can be attained for both manned and unmanned missions. One method involves oxygen production from the carbon dioxide rich Martian atmosphere using so…
Abstract Crystalline LaNi5 powder was synthesized by mechanical alloying of constituent metals preceding annealing at lower than a melting point of the alloy. The structure of the sample as mechanically alloyed was amorphous. After two-step heat treatments at 723 K in a stream of hydrogen and at 1273 K in helium, the…
Keywords PARSONS BRINCKERHOFF, BABSON COLLEGE WELLESLEY SUBGRADE, REACTIONS, ESTIMATING, COEFFICIENTS, PLANE, STRAIN, CONDITIONS, METHODS, FINITE ELEMENTS, ANALYSIS, BEAMS, SLABS, LOADED, SURFACES, HOMOGENEOUS, ELASTIC, SOILS, LAYERS, DESIGN, CUT AND COVER, TUNNELS, MODIFIED, FOUNDATIONS, MODULUS, RATIOS, STIFFNESS, T…
A number of polyurethanes were synthesized by reacting castor oil with isophorone diisocyanate while varying the NCO/OH ratio. All these polyurethanes were reacted with such acrylic monomers as acrylamide and methacrylamide by using ethylene glycol dimethacrylate as a crosslinker and benzoyl peroxide as the initiator.…
Correction factors for calculating maximum mesh and step voltages associated with grid and combined grid-multiple rod ground electrodes are defined and calculated for a wide set of ground electrodes and various two-layer soil structures. The results obtained are presented as graphs appropriate for a straightforward pr…