Materials Literature
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Abstract The feasibility of constructing polymer/clay nanocomposites with polypeptides as the matrix material is shown. Cationic poly‐L‐lysine · HBr (PLL) was reinforced by sodium montmorillonite clay. The PLL/clay nanocomposites were made via the solution‐intercalation film‐casting technique. X‐ray diffraction and tr…
Bis(3-thienyl)- and bis(2-thienyl)ethenes having nitronyl nitroxide radicals at both ends of the molecules were synthesized. Bis(3-thienyl)ethene diradicals underwent a reversible photochromic reaction by irradiation with UV and visible light. Photoswitching of intramolecular magnetic interaction was proved by EPR spe…
The radiation crosslinking of poly(L-lactide) (PLLA) was investigated using triallyl isocyanurate (TAIC) as a crosslinking agent. The gel fraction of crosslinked PLLA increased with TAIC concentration and γ-ray dose. Crosslinking of PLLA started at low TAIC contents and low γ-ray dosage. Differential scanning calorime…
Abstract Recent advances in surface grafting of polymers onto carbon materials, such as carbon black, graphite powder, and carbon fiber, and the application of polymer-grafted carbon materials as a novel functional materials have been mainly reviewed. The grafting of polymers onto the surface was achieved by (1) graft…
A mesoporous silica film was prepared on a silicon substrate using a spin-coating process followed by a tetraethyl orthosilicate (TEOS) vapor treatment. The TEOS-treated mesostructured silica film did not contract during calcination, showing high structural stability. Thermal treatment without TEOS vapor was not effec…
Palladium complexes of a variety of β- and γ-iminophosphines have been prepared and characterized by X-ray diffraction studies. Their properties as catalyst for three different Stille coupling reactions have been investigated and compared to catalytic performances of a phosphorus-containing dendrimer incorporating ana…
We present a real-time investigation of ultra-fast carrier dynamics in single-wall carbon nanotube bundles using femtosecond time-resolved photoelectron spectroscopy. The experiments allow us to study the processes governing the sub-picosecond and the picosecond dynamics of non-equilibrium charge carriers. On the sub-…
ABSTRACT: Protein films [cast corn zein (CCZ), heat‐pressed corn zein (HPCZ), cast wheat gluten (CWG), and heat‐pressed wheat gluten (HPWG)] were studied at different exposure temperatures (5, 25, 35, and 45 °C) to determine nisin diffusion in aqueous model systems. Kinetics of nisin diffusion in protein films followe…
X-ray structures of proteins bound to ligand molecules containing a nucleic acid base were systematically searched for cation-pi interactions between the base and a positively charged or partially charged side chain group located above it, using geometric criteria. Such interactions were found in 38% of the complexes…
A magnetic cluster is a group of magnetic ions (“spins”) that interact with each other but which, to a good approximation, do not interact with other magnetic ions. Such clusters are responsible for many of the interesting and useful properties of a large number of molecular crystals, and of dilute magnetic materials…
We find no physical basis for traditional mass-fraction weighted averaging of X-ray continuum measured in pure elements to estimate continuum production from compounds. Measurements of continuum from pairs of stable isotopes demonstrate that mass alone (the presence of more or fewer neutrons) has no effect on continuu…
The reinforcement of rubber by fillers is of great practical and technical importance. Bone meal waste and Ca(HPO 4 ) 2 , were evaluated as reinforcing fillers for natural, chloroprene rubber and their blend comparing them with white conventional filler, CaCO 3 . It was clearly seen that, the properties of the recomme…
ZnO films were grown on (0001) sapphire substrates using rf plasma-assisted molecular beam epitaxy. Distinct rotation domain structures were observed in ZnO films grown on Al-terminated or O-terminated sapphire surfaces. Therefore, the Ga pre-exposure process was adopted to modify the sapphire (0001) surface just befo…
Abstract When plastic film packaging is processed for reuse, residual ink colors the polymer and makes the polymer less stiff, weaker, and denser than the original material. These problems can be avoided if the printing is removed from the plastic film surface. In this study, a commercial polyethylene film with water‐…
Abstract A model for particle settling velocities in polydisperse suspensions is proposed alongside normalized particle self and interaction mobilities. The model predictions are compared with other models (Davis and Gecol, 1994; and Al‐Naafa and Selim, 1989), as well as published experimental data. A general agreemen…
A new type of 110 kV and 220 kV whole-solid-insulation polymeric ZnO surge arresters are developed. The power loss characteristics of ZnO varistors are discussed, which are simulated by an artificial neural network (ANN) model. The thermal performances of the new developed polymeric arresters are analyzed by the finit…
Abstract An alternative catalyst to the traditional KOH was studied for preparation of polyols, having high molecular weight (about 6 000 g mol −1 ) and low unsaturation content. KOH catalyst is useful until the equivalent weight of the polyol reaches about 1 000 g mol −1 , at which point an excess of allylic terminal…
Na sociedade contemporânea, uma solução ou um equacionamento minimamente satisfatório para os graves problemas ambientais decorrentes da larga utilização de polímeros tem se constituído num dos grandes desafios colocados para a comunidade científica. Na busca por soluções desejáveis, e como alternativa aos polímeros c…
The structural phase transition between the polymorphs of syndiotactic polystyrene has been studied by means of molecular dynamics simulation. It was found that the initial δe form of the crystal structure was completely transformed into the γ form by thermal treatment. Not only the crystal structure but also the tran…
The tensile, impact and bending properties of calcium carbonate (CaCO 3 ) filled acrylonitrile-butadiene-styrene copolymer (ABS) composites were measured at room temperature. It was found that the tensile modulus increased nonlinearly with increasing the weight fraction φ + of the fillers, and the tensile strength and…