Materials Literature
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On the basis of crystal chemical analysis and modeling KDP structure, the mechanism of incorporation of bivalent ions (Ni2+, Co2+, Fe2+, Mn2+) of radii 0.75 Å < r < 1.1 Å and trivalent ions (Al3+, Fe3+, Mn3+, Y3+, La3+) in KDP crystals is analyzed. For the considered bivalent (Me2+) and trivalent (Me3+) impurity ions,…
Abstract Poly(ether ester) elastomers (PEEs) were synthesized in which dimethyl terephthalate (DMT) was the primary diester compound in the hard segment (H/S) and dimethyl 2,6‐naphthalene dicarboxylate (NDC), which has a more rigid aromatic chemical structure than DMT, was the secondary diester in the H/S. The block P…
Abstract T 2 proton NMR relaxation times were used to follow the changes in the macromolecular chain mobility of a chemically (by dicumyl peroxide) cross‐linked polybutadiene matrix. The same phenomenon was also studied by an investigation of the ability of the polymer to crystallize using DSC measurements. The solubi…
Abstract Jute textile was recycled into composites using different percents of phenol formaldehyde (PF) resin. The effect of the resin percent, from 12 to 30%, on the flexural strength, tensile strength, water absorption, and thickness swelling of the produced composites was studied. To improve the dimensional stabili…
PFG NMR results are reported on H 2 O, PEG200, PEG1500, PEG8000, and PEG20000 in wet cotton fibers and H 2 O in wet cotton linters. The data are analyzed in terms of a two-site exchange model (water/cotton) and show that the probe molecules in fibers are trapped in cages. The cage size decreases from 10 to 2 μm as the…
Abstract Cocoa pod powdered (CP) and Carbonized Cocoa pod powdered (CCP) sieved through 150 μm mesh were characterized in terms of loss on ignition, surface area, moisture content, and oil absorption and used as filler in compounding natural rubber and vulcanized using efficient vulcanization system. The processing an…
Abstract An organophosphorus epoxy resin with diglycidyl ether of bisphenol A (DGEBA), which has improved fire performance, was synthesized from the reaction of 9,10‐dihydro‐9‐oxa‐10‐phosphaphenanthrene‐10‐oxide and DGEBA. The epoxy resin was then cured with an isomeric mixture of 3,5‐diethyltoluene‐2,4‐diamine and 3,…
Abstract Nylon 6 (PA6) is a widely used engineering plastic. However, its poor toughness limits its applications. Therefore, toughening PA6 has been a point of interest in the field of PA6 modification. Generally, toughening a plastic with an elastomer reduces the stiffness and heat distortion temperature of the matri…
Abstract Microspheres based on synthetic polymers such as poly(methyl methacrylate) (PMMA) and PMMA blends are known for their medical and optical applications. The development of methods for processing polymeric microspheres using a nontoxic solvent, like supercritical carbon dioxide (SCCO 2 ), is desirable. This wor…
[reaction: see text] A readily available chiral amino alcohol has been immobilized on silica by sol-gel synthesis and grafting. The solid prepared according to the latter method led to the best enantioselectivity (77% ee) described for the asymmetric addition of diethylzinc to benzaldehyde using inorganic solids.
Iron(II) 2-aza-21-carbaporphyrins have been characterized by paramagnetically shifted (1)H and (2)H NMR spectra. The high-spin iron(II) complex (HCTPPH)Fe(II)Br displays the beta-H resonances which reflect the combination sigma and pi routes of spin density delocalization. The uniquely large isotropic shift of the inn…
Polypyrrole (PPy) films obtained by low-current galvanostatic polymerization of pyrrole in propylene carbonate solutions exhibit excellent reversibility, high anodic stability, and, at the same time, a characteristic change in the shape of the voltammetric response and an increase in the film's doping level during lon…
Abstract The preparation of new cellulose fiber reinforced thermoplastics is described, and the mechanical properties and water absorption of these materials are measured. In order to improve the compatibility between cellulosic and plastic materials, different amounts of coupling agents, such as organotitanate compou…
With the growth in the aged population and the need to extend average individual healthspan, biomaterials have an increasingly important role in the development of new generation medical devices, drug delivery systems, and medical diagnostic technologies. This column seeks to provide an insight into the latest develop…
The optical transmittance and reflectance of SbSI single crystals had been measured for photon energies from 1.5 to 2.6 eV in temperature range from 77 K to 343 K. The experimental data had been evaluated to determine anisotropic, spectral and temperature dependences of real part of refractive index and absorption coe…
In this article a novel methodology for the development of hardfacing materials, the so-called laser-assisted rapid-alloy-prototyping technique, based on variable powder feed rate laser cladding, is described. An Fe–Cr–C metallic matrix composite, reinforced with NbC carbide particles, was chosen as a case study for t…
Abstract Brill transition behaviour of nylons 6/16, 4/16 and 2/16 has been studied systematically by variable‐temperature wide‐angle X‐ray diffraction (WAXD) and real‐time FTIR. It is shown that all nylons investigated undergo Brill transitions before melting on heating. Brill temperatures detected by real‐time FTIR a…
A 7.8 kb fragment containing isocitrate dehydrogenase (ICDH) gene and its flanking regions was cloned from Escherichia coli BL21(DE3) and sequenced. Unlike the case of the K-12 strain, the e14 element was not found. The nucleotide divergence between these two strains was about 2%. Using the cloned fragment, ICDH defec…
Abstract Purified natural rubber (PNR) was obtained by treatment of high ammonia NR latex with proteinase enzyme for 24 h, followed by double centrifugation. The PNR was later redispersed into latex form with 0.5% (w/v) sodium dodecyl sulfate. The degradation of PNR was performed in latex form by using a combination o…
We have investigated the magnetic and elastic properties of rare-earth monopnictide TbSb by means of specific heat, high-field magnetization, and ultrasonic measurements. A pronounced anomaly was observed in the specific heat and elastic constants at an antiferromagnetic transition of ${T}_{N}=15.5\mathrm{K}.$ A prono…