Materials Literature
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Polyaniline films are found to expand and contract by electrochemical oxidation and reduction, respectively. Two polyaniline films are used as cathode and anode muscles. In this system, the proton transfer between the films are essential chemical reaction. Two types of actuators, viz., “Backbone-type” and “Shell-type”…
Lactic acid-based aliphatic polyesters (PLAs) are well known biocompatible bioresorbable polymers which are being increasingly used as biomaterials for temporary therapeutic applications. Because of their sensitivity to water and the formation of degradation by-products which can be easily metabolized by microorganism…
Magnetic refrigeration, an emerging new technology for cooling and gas liquefaction, needs magnetic materials with specific thermomagnetic behavior. Depending on the thermodynamic cycle selected, the isothermal magnetic entropy change or the adiabatic temperature change upon field application needs to be a preselected…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and Thermodynamics of Symmetric Poly(A-block-B-block-C) Triblock CopolymersReimund Stadler, Clemens Auschra, Joerg Beckmann, Udo Krappe, Ingrid Voight-Martin, and Ludwik LeiblerCite this: Macromolecules 1995, 28, 9, 3080–3097Publication Date (Print):April 1, 1995P…
No abstract.
Manufacturing of bulk ceramic components from materials in the system Si‐Me‐C‐N‐O (Me = Ti, Cr, V, Mo, Si, B, CrSi 2 , MoSi 2 , etc.) from preceramic organosilicon polymers ‐ such as poly(carbosilanes), poly(silazanes), or poly(siloxanes) ‐ has become possible by incorporating reactive filler particles into the liquid…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDrop Breakup and Coalescence in Polymer Blends: The Effects of Concentration and CompatibilizationUttandaraman Sundararaj and C. W. MacoskoCite this: Macromolecules 1995, 28, 8, 2647–2657Publication Date (Print):April 1, 1995Publication History Published online1 May 2002Publ…
Very strong antiferromagnetic coupling exists between the Fe centers in the N-bridged complexes 1 and 2. In 1 (shown on the right), which contains a symmetrical [FeIV = N = FeIV] unit, this results in an S = 0 ground state, while in 2, which has an unsymmetrical FeIII–N = FeIV bridge, it leads to an S = 3/2 ground sta…
Cyclotetramerization of a hydroxymethylphenanthropyrrole afforded a highly conjugated porphyrin 1 with four annelated phenanthrene rings. The 68 carbon atoms in the dication of this highly symmetrical heptadecacycle–the neutral compound is virtually insoluble in most organic solvents–produced only nine resonances in t…
We present a new formulation of ab initio molecular dynamics which exploits the efficiency of plane waves in adaptive curvilinear coordinates, and thus provides an accurate treatment of first-row elements. The method is used to perform a molecular dynamics simulation of the CO_2 molecule, and allows to reproduce detai…
Recent neutron scattering experiments on the microscopic dynamics of polymers below and above the glass transition temperature T(g) are reviewed. The results presented cover different dynamic processes appearing in glasses: local motions, vibrations, and different relaxation processes such as alpha- and beta-relaxatio…
Physical aging refers to structural relaxation of the glassy state toward the metastable equilibrium amorphous state, and it is accompanied by changes in almost all physical properties. These changes, which must be taken into account in the design, manufacture, and use of glassy polymer materials and devices, present…
Various static and dynamic phenomena displayed by glass-forming liquids, particularly those near the so-called "fragile" limit, emerge as manifestations of the multidimensional complex topography of the collective potential energy function. These include non-Arrhenius viscosity and relaxation times, bifurcation betwee…
Glasses can be formed by many routes. In some cases, distinct polyamorphic forms are found. The normal mode of glass formation is cooling of a viscous liquid. Liquid behavior during cooling is classified between "strong" and "fragile," and the three canonical characteristics of relaxing liquids are correlated through…
The authors report what is, to their knowledge, the highest electro-optic effect measured in a germanosilicate fibre ever reported. The electro-optic effect based on a permanent second-order nonlinearity has been induced by UV-excited poling at 193 nm with an electric field > 8 × 105 V/cm. Polarisation dependence o…
Surface reconstructions of Au film on Pd(110) substrate are studied using a local Einstein approximation to quasiharmonic theory with the Sutton-Chen interatomic potential. Temperature dependent surface free energies for different coverages and surface structures are calculated. Experimentally observed transformations…
Diagenetically altered rhyolitic rocks consisting of major mordenite and minor cristobalite and smectite occur beneath a thick (about 90 m) smectite-rich layer in an abandoned quarry at Cala Fontana, in the northwestern part of the Ponza Island (Thyrrenian Sea, Gulf of Gaeta). The structure of the mordenite was refine…
The energetics of H$_2$ interacting with the Si(100) surface is studied by means of {\em ab initio} total energy calculations within the framework of density functional theory. We find a direct desorption pathway from the mono-hydride phase which is compatible with experimental activation energies and demonstrate the…
The evaluation of Coulomb forces is a difficult task. The summations that are involved converge only conditionally and care has to be taken in selecting the appropriate procedure to define the limits. The Ewald method is a standard method for obtaining Coulomb forces, but this method is rather slow, since it depends o…
Abstract The compounds 1,1‐bis[5‐(2‐ethylhexyl, 2‐octyl, hexyl, and butyl)carboxylate‐2‐furyl)ethane, and 5,5′‐dihexylcarboxylate‐2,2′ bifuran were synthesized from furfural and characterized for their plasticizing abilities toward polyvinyl chloride (PVC) by dynamic mechanical thermal analyses (DMTA) with di‐(2‐ethyl…