Materials Literature
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A positron annihilation lifetime spectroscopic (PALS) study was carried out on a typical representative of simple hydrogen-bonded glass formers - glycerol - over a wide temperature region from 100 K up to room temperature. Several crossover temperatures, T b i , were identified in the temperature dependences of the or…
In this article, two aspects were studied to enhance the properties of nitrile-butadiene rubber/polypropylene (NBR/PP) blends. First, three kinds of curing systems (dicumyl peroxide [DCP]/SnCl2·2H2O, SP-2402/SnCl2·2H2O, sulfur/DM) were added into the blends to study the influence of the curing system on NBR/PP blends.…
Polarization holography is used to study the dynamics of optically induced gratings in azobenzene functionalized polymer films. The simultaneously formed birefringence grating (BG) and surface relief grating (SRG) are investigated by probing the grating formation process with orthogonal linearly polarized beams for di…
Etherification of 2,4,4-trimethyl-1-pentene and 2,4,4-trimethyl-2-pentene with methanol was catalyzed with a novel Smopex-101 catalyst, which is a polyethylene-based ion-exchange fiber. Several kinetic models were tested to describe the experimental data. The Langmuir−Hinshelwood-type model, in which the adsorption of…
Sixteen mesoporous vanado-phosphoro-aluminate solids, of the general formula Al 100 P X V Y ( X, Y = 0, 5, 10, 20), have been prepared and characterized by their N 2 adsorption/desorption isotherms. The materials were truly mesoporous, and the addition of P and/or V affects in a very precise and profound way the corre…
The reactions of thenoyltrifluoroacetone (HTTF) and LnCl3 (Ln = Dy(III), Er(III), Gd(III), Ho(III) and Sm(III)) in 3:1 ligand:metal molar ratio have been investigated. The isolated solid products have been characterized by spectroscopy (UV-Vis, IR and 1H NMR), thermogravimetry and elemental analyses. The microanalytic…
On the basis of multifactor analysis of the most representative experimental data on the solubility, electrical resistance, and diffusivity of hydrogen in palladium specimens with high and low dislocation densities, it has been shown that the structure, composition, diameter (up to several nm), contribution to electri…
Nanocomposite materials of Co II Co III 2- x Al x O 4 −Al 2 O 3 (0 ≤ x < 1.63) have been prepared from biphasic xerogels that contain the cobalt hydrotalcite-like compound Co II 0.73 Co III 0.27 (OH) 2.00 (NO 3 ) 0.23 (CO 3 ) 0.02 ·0.5H 2 O and sol−gel-derived Al 2 O 3 . With XRD/FTIR/XPS/DSC/TGA methods, an investiga…
Amorphous polyurethane (PU)–based shape memory polymers (SMPs) were synthesized with different extents of allophanate reactions, hard segment contents, and types of polyol. They were characterized in terms of hydrogen bonding, mechanical, dynamic mechanical, and thermomechanical properties of solution-cast films. Poly…
The system zirconia−praseodymia (Pr content 0−15 mol %) has been investigated to evaluate the praseodymium solubility and its role in the zirconia phase stability. The powders have been synthesized by coprecipitation and subsequent calcination at different temperatures (400−1000 °C) for 2 h. The crystal structure of t…
Phase change materials (PCMs) of cellulose diacetate (CDA) modified with polyethylene glycol (PEG) prepared by chemical bonding and physical blending methods exhibit different characteristics: Chemically bonded materials exhibit typical solid-solid phase change characteristics, but the blended materials exhibit solid-…
The crystalline lamellar thickness of semicrystalline poly(ethylene terephthalate) (PET) was evaluated using small-angle X-ray scattering (SAXS) and transmission electron microscopy (TEM) techniques. Both SAXS onedimensional (1D) correlation function and interface distribution function analyses were utilized to determ…
*Reprinted from Handbook of Polyethylene: Structures, Properties, and Applications; Marcel Dekker, Inc.: New York; 2000, 375–414.
The effects of heat-treatment on the structure of the strontium ion-exchanged titanosilicate ETS-4 have been studied by Rietveld analysis of powder neutron diffraction data and by FT-Raman spectroscopy. Hydrous Sr-ETS-4 (space group Cmmm), upon heat-treatment under inert atmosphere at temperatures between 423 and 573…
Isotactic poly(3-hydroxybutyrate) (P3HB) is an aliphatic polyester obtained by bacterial fermentation. This truly biodegradable polymer has been widely investigated, mainly with the aim to replace conventional plastics, which cause environmental pollution. To improve its properties, extensive studies have been conduct…
The synthesis of new chiral polyisocyanates is described. For this purpose a new chiral azobenzene containing monomer with the chiral center in α-position to the isocyanate group was synthesized. The anionic copolymerization was carried out in THF as solvent with potassium cyanide that was complexed by 18-crown-6 as i…
The purpose of this article is twofold. First, there is an account of the hot-compaction behavior of a new, highly oriented, high-modulus polyethylene (PE) tape with the trade name of Tensylon® (manufactured by Synthetic Industries, USA). This tape, produced by a melt spinning route, has mechanical properties comparab…
Morphology and molecular structure of three nascent ultra high molecular weight polyethylene (UHMWPE) powders synthesized on unsupported and supported Ziegler-Natta heterogeneous catalysts were studied with the help of electron microscopy and infrared (IR) spectroscopy. A synthesis was carried out in a slurry process…
Different charged forms of substitutional oxygen in diamond are examined using ab initio plane-wave pseudopotential calculations. The results show that two defect levels are associated with substitutional oxygen and that the charged form of the defect depends sensitively on the Fermi level. One of the defect states li…
A model is presented for the magnon-phonon interaction in three-dimensional cubic ferromagnetic systems. The Heisenberg Hamiltonian for localized spins is used. The calculated magnon and phonon dampings are compared with the experiments and good agreement is found. It is estimated that there is a significant broadenin…