Materials Literature
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Copolymer resins were synthesized by the mixed condensation of resorcinol–CH2O, resorcinol–aniline–CH2O, resorcinol–aniline–thiourea–CH2O, and resorcinol–aniline–urea–thiourea–CH2O with a view to develop synthetic resins having improved properties and performance like toughness, mechanical properties, thermal resistan…
The reaction of Na[V -I (CO) 6 ]·2diglyme, V I (C 5 H 5 )(CO) 4, [Et 4 N][V -I (CO) 6 ], V o (C 5 H 5 )(C 7 H 7 ), V o (CO) 6, [V I (C 6 H 6 ) 2 ][PF 6 ], [V I- (C 6 H 6 ) 2 ][V -I (CO) 6 ], V II (C 5 H 5 ) 2, [V II (NCMe) 6 ][BPh 4 ] 2, [V II- (NCMe) 6 ]-[V -I (CO) 6 ] 2, and [V II (THF) 6 ][V I (CO) 6 ] 2, with tetr…
Some Fe(II)-l,2,4-triazole derivatives exhibit very abrupt thermally induced spin transitions around room temperature, accompanied by a well pronounced change of color, between purple in the low-spin (LS) state and white in the high-spin (HS) state. Our objective is to obtain such compounds for which the ambiant tempe…
Three microstructures of polypropylene (PP)/elastomer/filler hybrids were obtained by processing control and elastomer or PP surface modification: (a) filler and elastomer particles are dispersed in a PP matrix to form separate particles; (b) elastomer particles with a filler core are distributed in a PP matrix; or (c…
The shepherd Magnes in the ancient Greek province of Magnesia in Thessaly is attributed to be the first to note that some rocks stuck to the nails of his shoes and the tip of his staff as he minded his flock of sheep. These seemingly magical rocks called Magnes Lapis at the time were later known as lodestone (leading…
A series of polycaprolactone/4,4′-diphenylmethane diisocyanate/1,4-butanediol (PCL/MDI/BDO) segmented polyurethanes of different compositions was synthesized by solution polymerization. The molecular weight of PCL diols used was in the range of 1600–7000. The crystallinity and morphology of these polymers were studied…
Clay minerals serve as petrological markers that can he used to measure and interpret ongoing changes in River Nile sedimentation, now largely affected by anthropogenic influences. Closure in 1964 of the High Dam at Aswan, in particular, has entrained marked changes of clay mineral assemblages along the Nile in Egypt.…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
We report here a general solution of the double-exchange problem in the high-nuclearity mixed valence systems containing arbitrary number P of the electrons delocalized over the network of N (P<N) localized spins. The developed approach is based on the successive (chainlike) spin-coupling scheme and takes full…
To determine the merits of the conjecture for a distinct phase of liquid water below 160 K, and of its computer simulation [Nature 380, 328 (1996)], the dielectric relaxation times of pure bulk water and pure water sequestered in the pores of various polymer matrices are examined. The new data combined with the litera…
We report results of numerical analyses on the surface (macroparticle) interactions in simple fluids. The singlet Ornstein–Zernike theories with hypernetted-chain closures are employed. With no (or very weak) attraction in the surface–fluid interaction uMS, both the interaction φMM and the force fMM between macroparti…
Physical properties of alloys are compared as computed from ``direct'' and ``inverse'' procedures. The direct procedure involves Monte Carlo simulations of a set of local density approximation (LDA)-derived pair and multibody interactions {ν_f}, generating short-range order (SRO), ground states, order- disorder transi…
The phonon dispersion relations and the elastic constants are evaluated for Wigner electron crystals near the critical coupling strength for melting in the fully quantal regime at zero temperature. The structures considered are the body-centred and face-centred cubic lattices in dimensionality D = 3 and the triangular…
The formation of stress-induced martensite in superelastic NiTi was studied by neutron diffraction during uniaxial compressive loading and unloading. The respective phase fractions were determined as a function of the applied stresses using a Rietveld refinement with a March–Dollase texture formulation. Before loading…
We report the electrical conductivity between 2 and 300 K for across the composition-controlled metal - insulator (m - i) transition. Using a method first suggested by Möbius, we identify the critical concentration to be 0.3 for the m - i transition. The negative temperature coefficient of resistivity observed at low…
The correlated quasiparticle energies for valence bands of polyethylene have been calculated, ab initio, employing many-body perturbation theory. Electron correlation effects for the bands vary from 1.5 to 5.4 eV. The MBPT(2) band energies accurately explain the measured photoelectron spectra (XPS, UPS) of polyethylen…
We report on the thermally activated hysteresis relaxation effects in (La,Sr)CoO3/ (Pb,La)(Zr,Ti)O3/(La,Sr)CoO3 thin film ferroelectric capacitors. Films cooled in oxygen deficient ambients exhibit a marked voltage offset in the hysteresis loops. Upon the application of a dc bias voltage or unidirectional pulses of th…
Far-infrared ellipsometric spectra of n-type (100) GaAs display sharp features in the range of the longitudinal optical phonon of intrinsic material, originating in the surface depletion region. We compare measured relative ellipsometric phase shifts with model calculations of the graded depletion layer. A very good a…
Results on the conductivity as a function of temperature of carbon black - polymer composites with a wide range of loadings are presented and discussed. Inter-particle transfers dominate the resistivity in the low-loading composites, and the conductivity is described quantitatively by the theory of fluctuation-induced…
The time dependence of the size, shape, and concentration of ordered grains in a quenched block copolymer melt was studied by depolarized light scattering. Block copolymers are ideal systems for kinetic studies because the single scattering limit applies during all stages of grain growth. In the early stage, where the…