Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Abstract Blends of styrene–butadiene–styrene (SBS) or styrene–ethylene/1‐butene–styrene (SEBS) triblock copolymers with a commercial mixture of polystyrene (PS) and poly(2,6‐dimethyl‐1,4‐phenylene oxide) (PPO) were prepared in the melt at different temperatures according to the chemical kind of the copolymer. Although…
Structures of porcine insulin crystals soaked in 1 M sodium sulfate at pH 5.00, 5.53, 5.80, 6.00, 6.16, 6.26, 6.35, 6.50, 6.98 and 9.00 have been determined at between 1.7 and 1.9 A resolution. GluB13 exhibits a single conformation at pH </= 5.80, two conformations between pH 6.00 and 6.98 and a single conformation at…
Abstract The morphology, mechanical and viscoelastic behavior of latex blends of unvulcanized natural rubber (NR) with carboxylated styrene‐butadiene rubber (XSBR) were investigated, with special reference to the effect of the blend ratio, temperature, and frequency. Mechanical properties like tensile strength, modulu…
The ${}^{93}\mathrm{Nb}$ and ${}^{45}\mathrm{Sc}$ nuclear-magnetic-resonance (NMR) spectra of disordered relaxor ferroelectrics ${\mathrm{PbSc}}_{1/2}{\mathrm{Nb}}_{1/2}{\mathrm{O}}_{3}$ (PSN) and ${\mathrm{PbMg}}_{1/3}{\mathrm{Nb}}_{2/3}{\mathrm{O}}_{3}$ (PMN) have been studied at $T>{T}_{m},$ where ${T}_{m}\ensur…
We consider molecular dynamics simulations to study a polymerlike liquid meniscus between two parallel plates moving at constant opposite velocities. We investigate contact line motion versus the speed of the solid and the shapes of the liquid interface for several liquid/solid interaction amplitudes. The associated w…
An interfacial stress rheometer has been used to study the rheological properties of a silicone oil/water interface in the presence of siloxane surfactants that are used in the personal care industry as water-in-silicone-oil emulsifiers. The surfactants are graft-type poly(dimethylsiloxane)−poly(oxyalkylene) copolymer…
We show that the existence of stable, ordered $3d\ensuremath{-}5d$ intermetallics CuAu and NiPt, as opposed to the unstable $3d\ensuremath{-}4d$ isovalent analogs CuAg and NiPd, results from relativity. First, in shrinking the equilibrium volume of the $5d$ element, relativity reduces the atomic size mismatch with res…
Abstract A method to quantify the composition of thin films using infrared spectroscopic ellipsometry (IRSE), supplemented by visible spectroscopic ellipsometry (VISSE), is proposed. Because ellipsometry measures the thickness and optical constants of a surface layer simultaneously, the absorption coefficient of the f…
Branched copolymers with a dendritic structure were synthesized by grafting poly(2-vinylpyridine) (P2VP) side chains onto linear and arborescent polystyrene substrates of generations G0−G2 randomly functionalized with acetyl groups. The P2VP side chains were generated in tetrahydrofuran using 1,1-diphenyl-3-methylpent…
We have carried out a broad survey of tetraphenylporphyrin derivatives in relation to their possible hyperporphyrin character. The majority of the free-base tetraphenylporphyrins studied, i.e., TArPH 2; Ar = p -X−C 6 H 4, where X = CH 3, H, F, CF 3, and NO 2, when dissolved in trifluoroacetic acid (i.e. when centrally…
The technique of high-temperature oxidation tandem differential mobility analysis has been applied to the study of diesel nanoparticle oxidation. The oxidation rates in air of diesel nanoparticles sampled directly from the exhaust stream of a medium-duty diesel engine were measured over the temperature range of 800-11…
To investigate the luminescent and thermal properties of organic compounds with rigid entities, a series of new blue/purple luminescent bridging ligands, 4,4'-(N-7-azaindolyl)diphenylacetylene (5), 4-(N-7-azaindolyl)-4'-(2,2'-dipyridylamino)diphenylacetylene (6), 4,4'-(2,2'-dipyridylamino)diphenylacetylene (7), and 4,…
Sparse-matrix sampling using commercially available crystallization screen kits has become the most popular way of determining the preliminary crystallization conditions for macromolecules. In this study, the efficiency of three commercial screening kits, Crystal Screen and Crystal Screen 2 (Hampton Research), Wizard…
Abstract Blends of poly(ethylene terephthalate)/poly(ethylene 2,6‐naphthalene dicarboxylate) (PET/PEN) have exhibited properties that are of commercial interest to the packaging industry. Melt processing of PET with PEN results in transesterification reactions. The blend properties are controlled by the kinetics of th…
Five test structures (orthorhombic and trigonal trypsin, cubic and rhombohedral insulin and thaumatin) have been solved by the SAD (single-wavelength anomalous diffraction) method using highly redundant data collected at 100 K with a CCD detector, rotating-anode generator and three-circle goniometer. The very weak ano…
We have used a multi-technique approach to allow us to build a consistent picture of the carbons used for catalyst supports and suggest reasons for the differences between the supports. From the catalyst tests it is clear that the nature of the support has a major influence on the catalyst performance. In part, this i…
Abstract Electrically conductive resins can be made by adding electrically conductive fillers to typically insulating polymers. Resins with an electrical resistivity of approximately 10 0 Ω cm or less can be used for electromagnetic and radio frequency interference shielding applications. This research focused on perf…
Calculations for optical excitations in confined systems require knowledge of the inverse screening dielectric function ${ϵ}^{\ensuremath{-}1}(\mathbf{r},{\mathbf{r}}^{\mathbf{\ensuremath{'}}})$, which plays a crucial role in determining exciton binding energies. We present a new efficient real-space method of inverti…
Abstract In this work, heat‐shrinkable characteristics of a polyethylene compound were obtained by blending mixtures of low‐density polyethylene with varying amount of peroxide. These were then extruded and molded to the required shape and then cross‐linked by chemical means, followed by heating and stretching and the…
Films and 200-nm wire arrays of Bi 1- x Sb x alloys, one of the best known low-temperature thermoelectric materials, have been obtained by electrodeposition without the need for complexing the Sb cations in solution or further thermal treatment after deposition. The process consists of reduction of Bi 1- x Sb x direct…