Materials Literature
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Abstract Poly(dimethyl)siloxanes of different viscosity have been synthesized by hydrolytic condensation of dimethyldichloro silane. Polysiloxane dispersed ferroelectric liquid crystal (PDFLC) composite films were prepared simultaneously by solvent induced and polymer induced phase separation techniques (SIPS and PIPS…
Abstract The structural and conformational changes in solid‐phase chlorinated polyethylene samples of different average molecular masses were studied with infrared spectroscopy. Characteristic absorption bands for both chlorinated polyethylene and chlorinated high‐molecular‐mass polyethylene, containing 1–56% Cl, were…
We have found that the simple introduction of Fe into a conventional NiCo catalyst enables the production of single-wall carbon nanotubes (SWNTs) with controlled diameter distributions by laser ablation. The diameter of as-grown SWNTs can be made larger by increasing the atomic percentage of Fe in the target without c…
Abstract Water‐based polyurethane–urea (WPUU) nanoparticles containing 4,4′‐methylenedi‐ p ‐phenyl diisocyanate (MDI) and isophorone diisocyanate (IPDI) were synthesized by a stepwise prepolymer mixing process, that is, the consecutive formation of hydroxyl‐terminated and isocyanate‐terminated polyurethane prepolymers…
The aim of this work is to study the merging of the main α and the secondary β relaxations in poly(butyl acrylate)- i -poly(methyl methacrylate) sequential interpenetrating networks in comparison to net -poly(butyl acrylate)- co -poly(methyl methacrylate) random copolymer networks. In both cases 10% of ethylene glycol…
A simple and efficient preparation of a number of PEG‐carboxylates is described. The syntheses are considerably more cost‐effective than existing procedures and allow for easier purifications.
The availability of multiporphyrin arrays with defined architectures and good solubility in organic solvents is essential for a wide variety of physical studies. Herein the synthesis of linear multiporphyrin arrays (triads, tetrad, pentad) bearing solubilizing 7-tridecyl (swallowtail) groups is presented. The rodlike…
Nitrogen adsorption isotherms on organized mesoporous aluminas prepared by several different synthesis procedures were analyzed by means of comparative plot method using Aluminiumoxid C (Degussa) and alpha-alumina as reference adsorbents. To secure the high-resolution ability of this method, all the adsorption measure…
Abstract Incoherent neutron scattering is presented as a powerful tool for interpreting changes in molecular dynamics as a function of film thickness for a range of polymers. Motions on approximately nanosecond and faster timescales are quantified in terms of a mean‐square atomic displacement (〈 u 2 〉) from the Debye–…
Abstract The effect of various doses of γ radiation on the structural properties of water‐soluble polymer blends based on poly(vinyl alcohol) (PVA) and poly(ethylene glycol) (PEG) has been investigated. Although the aqueous solutions of individual PVA and PEG homopolymers were homogeneous and clear, films transparent…
Hydrotalcites are receiving considerable attention as adsorbents, catalysts, and catalyst precursors. However, the use of hydrotalcites as an adsorbent material for carbon dioxide has only been considered recently. In this work, three commercial hydrotalcites, Puralox MG30, MG50, and MG70, were used for the removal of…
This study focuses on the complexes formed between polystyrene- block -poly( N -ethyl-4-vinylpyridinium bromide) (PS- b -PEVP) and poly(sodium methacrylate) (PMANa). These complexes were synthesized as follows. First, PS- b -PEVP is dispersed in water, which results in the formation of the micelles with insoluble PS c…
A series of copper-based catalysts supported on zeolite-Y were prepared through a coprecipitation impregnation method and used for the synthesis of dimethyl ether (DME) directly from synthesis gas (syngas) in a fixed-bed reactor. The conversion of CO and the selectivity of DME increased from 7.7% and 5.9% on Cu/zeolit…
Calcite crystals nucleate on the (01.2) face on a diverse range of organic substrates, including self-assembled monolayers, hydrogen-bonded ribbons, and polymer rafts. The (01.2) face of calcite is a polar surface. Therefore macroscopic crystal growth can only occur if the dipole moment is quenched. We demonstrate tha…
Pendant drop experimental results are presented for the temperature dependence of the interfacial tension between water and the immiscible nematic liquid crystal 4'-pentyl-4-biphenylcarbonitrile (5CB) in the presence of the adsorbed surfactant cetyltrimethylammonium bromide (CTAB). Adsorption of the surfactant lowers…
Abstract The stress relaxation behavior of natural rubber (NR) and its composites reinforced with short coir fibers under tension was analyzed. The rate of stress relaxation was a measure of the increase in the entropy of the compounds: the higher the rate was, the greater the entropy was. At lower strain levels, the…
This paper deals with the incorporation of a vector hysteresis model in 2D finite-element (FE) magnetic field calculations. A previously proposed vector extension of the well-known scalar Jiles-Atherton model is considered. The vectorised hysteresis model is shown to have the same advantages as the scalar one: a limit…
Pyrrole (C 4 H 5 N) was embedded in low-temperature solid inert matrixes (argon, xenon; T = 9 K) and both the monomer and low-order aggregates characterized by FTIR spectroscopy. The spectroscopic studies were complemented by extensive theoretical [DFT(B3LYP)/6-311++G(d,p)] structural and vibrational studies carried o…
Abstract The thermal behavior of vinyl ester resin matrix composites reinforced with jute fibers treated for 2, 4, 6, and 8 h with 5% NaOH was studied with Thermo‐gravimetric analysis and differential scanning calorimetry. The moisture desorption peak shifted to a higher temperature, from 37 to 58.3°C, for all the tre…
Exopolymers (EPS) are exuded by single-celled and multicellular organisms. They consist mainly of carbohydrates that hydrate on contact with water and EPS are absorbent and often thixotropic. These properties result in a large number of uses: for attachments, as an aid to flotation, in locomotion, in feeding, for buil…