Materials Literature
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Gas phase hydrogenation of acetonitrile has been studied with various Pd-based catalysts using several supports, ZrO2, CeO2, MgO, SiO2, Al2O3, ZnO, Ga2O3 and In2O3. The catalysts may be divided into two groups, one of which includes ZnO, Ga2O3, and In2O3-supported catalysts and another group includes the other catalys…
The compatibilizing effect of nano sized calcium carbonate filler on immiscible blends of styrene-co-acrylonitrile/ethylene propylene diene (SAN/EPDM) was examined. The surface energy of the calcium carbonate was modified by stearic acid. The compatibility of SAN/EPDM blends was studied by following the glass transiti…
Abstract In situ polymer/polymer short fiber composites were generated by a two‐step process. In the first step, a polyamide (PA) dispersed phase is blended with a polypropylene (PP) matrix in a twin‐screw extruder at a temperature at which both polymers are in molten state. The extrudate was then stretched at the die…
Abstract The effect of physical compatibilization on the deformation and coalescence of droplets in immiscible polymer blends is discussed. Evidence is provided for the existence of concentration gradients in block copolymers along the interface during deformation. This causes complex changes in droplet shapes during…
Inherently conducting polymers (ICPs) have been an area of intense interest over the past 30 years, culminating with the award of the 2000 Nobel Prize in Chemistry to MacDiarmid, Heeger and Shirakawa. More recently the unique properties of these materials (e.g., higher conductivity, more rapid discrete electrochemical…
Growth of single crystals of some protein aminoacids and synthesis and growth of single crystals of their related compounds are reported. The temperature dependence of the integrated piezoelectric response of the single crystals grown was studied in the temperature range 120–320 K. The specific features in the tempera…
The measurement and analysis of leakage current (LC) for condition-based monitoring of, and as a means of predicting flashover of polluted insulators has attracted a lot of research. Results presented in the technical literature show that surface arcing of contaminated insulators causes significant variations in the m…
Calcium sulphate subhydrates (CaSO4 · x H2O, 0 < x ≤ 0.8) have a honeycomb-shaped channel structure. The symmetry is either trigonal or a slight deviation thereof. Due to insufficient diffraction data and the high pseudosymmetry of the structure, it is not possible at this point to determine with certainty the specifi…
Single-walled (SWNTs) and multiple-walled (MWNTs) carbon nanotubes were solubilized via the esterification of nanotube-bound carboxylic acids by oligomeric polyethylene glycol compounds. The water-soluble samples were used as starting materials in reactions with bovine serum albumin (BSA) protein in ambient aqueous so…
Particulate-filled composites were prepared from CaCO 3 and polymer matrices of various acid-base characters. Interfacial interaction of the components was characterized by the reversible work of adhesion, which was calculated either from dipole-dipole or acid-base interactions. The thickness of the spontaneously form…
Alginate, chitosan and gelatin were deposited on the surface of PDL-LA films via an entrapment method. ATR-FT-IR, XPS and contact-angle analyses revealed the formation of stable thin biomacromolecule layers on the PDL-LA film, thus enhancing the hydrophilicity of the films. Confocal laser scanning microscopy showed th…
Abstract We have studied the influence of the addition of poly(butylene terephthalate) (PBT) to poly(ethylene‐ co ‐ethyl acrylate)‐carbon black (EEA‐CB) on the electrical properties of the blends, namely the resistivity and power dissipation of the monophasic and diphasic systems. The morphology of the latter blend is…
DNA Photolyase is a flavoprotein that uses light to repair cyclobutylpyrimidine dimers in DNA. From considerations of the crystal structure of the protein, it has been hypothesized that the dimer lesion is flipped out of the DNA double helix into the substrate binding pocket. We have used a fluorescent adenine analog,…
Abstract A well-ordered mesoporous carbon material has been prepared by a one-step chemical vapour infiltration process starting from a MCM-48 silica template.
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…