Materials Literature
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A series of regeneration experiments with physical activation were carried out on bleaching earth waste from the soybean refining process in a rotary reactor. The influence of activation parameters on the spent clay by varying the holding time of 1 to approximately 4 hours and temperature of 700 to approximately 900 d…
We have investigated the microfabrication of diamond films on silicon substrates using the localized electron beam (EB) chemical vapour deposition (CVD) method with a hydrogen (H 2 ) and methane (CH 4 ) mixed gas source. Micro-Raman spectra at 1, 3 and 5% CH 4 concentrations for the accelerating voltage of 10 kV have…
The temperature and concentration dependence of the dielectric response in ${\mathrm{Sr}}_{1\ensuremath{-}\ensuremath{\beta}}{\mathrm{Ca}}_{\ensuremath{\beta}}{\mathrm{TiO}}_{3}$ (SCT) is explained within the framework of the transverse field Ising model. Impurity-polarized clusters induce the appearance of a second-o…
Abstract The purpose of this research was to synthesize and characterize a novel class of four‐arm, star‐shape biodegradable polymers having double‐bond functionality as a precursor for free‐radical polymerization, with unsaturated monomers or macromers or photocrosslinking for network formation. The synthesis involve…
Agarose, gelatin, and silica gel media have been surveyed as appropriate matrixes for the crystal growth of sodium bromate (NaBrO 3 ). From pure aqueous solution, NaBrO 3 crystallizes with a characteristic tetrahedral habit. We have demonstrated that a greater variety of habits (e.g., cubic, tetrahedral, polyhedral, a…
Abstract Polypropylene–vermiculite nanocomposites can be achieved by simple melt mixing of maleic anhydride‐modified vermiculite with polypropylene. Maleic anhydride acts either as a compatibilizer for the polymeric matrix or as a swelling agent for the silicate. Compatibilized blends are injection molded directly fro…
Abstract Two series of waterborne polyurethane–urea anionomers were prepared by a polyaddition reaction with isophorone diisocyanate, poly(tetramethylene oxide) glycol (weight‐average molecular weight = 1000), dimethylol propionic acid (DMPA), and ethylene diamine as chain extenders. Triethylamine (TEA) or 28:1 mol/mo…
Abstract Freeze and freeze‐thaw durability characteristics of fiber reinforced polymer (FRP) composites, especially in the presence of moisture, need to be investigated prior to the widespread implementation of these materials in civil, polar, and offshore structural components and systems. The hygrothermal degradatio…
The reaction between [Co(H2O)6]2+ and [Co(CN)5]3- in deoxygenated water yields a dark blue solid of composition Co3[Co(CN)5]2.8H2O (1). X-ray powder diffraction data indicate a cubic Prussian blue-type framework, wherein the hexacyanometalate positions have only a two-thirds occupancy of square-pyramidal [Co(CN)5]3- u…
New complexes of the Schiff base salicylidene-2-aminothiophenol with VO(IV), Co(II), Ni(II), Cu(II) and Zn(II) have been synthesized and studied by thermogravimetric analysis and a general scheme of thermal decomposition of these complexes is proposed. The thermal dehydration and decomposition of these complexes were…
Abstract The nylon4 portion in the blend films composed of nylon4 and nylon6 was degraded and completely disappeared within 4 months in two kinds of composted soils gathered from different university farms as well as pure nylon4 film reported previously, while the nylon6 portion remained even after the burial test for…
The reaction of a nickel dithiolene complex (1) and ethylene is a two-step process, in which the trans-product (2) forms first in the direct addition of the olefin to 1, while the more thermodynamically stable cis-product (3) involves isomerization of 2. The introduction of electron-withdrawing groups (cyano or triflu…
The change in the surface structure of poly[(R)-3-hydroxybutyrate] [PHB] films upon the enzymatic hydrolysis was analyzed by attenuated total reflection infrared [ATR/IR] spectrometry. As enzymes, PHB depolymerases isolated from Ralstonia pickettii T1 and Pseudomonas stutzeri were used. By curve decomposition of the c…
A series of new triphenylamine-containing aromatic poly(amine- imide)s with high molecular weights were prepared either by a conventional two-step process starting from N,N′-bis(4-aminophenyl)-N,N′-diphenyl-1,4-phenylenediamine with various aromatic tetracarboxylic dianhydrides or by the one-step thioanhydride method…
A one-pot solvothermal reaction of iron(II) with meso-tetra(4-pyridyl)porphyrin (TPyP) leads to two novel layered structures with an unprecedented two-dimensional paddle-wheel-like pattern; the two structures have the same composition Fe(TPyP) but a different packing sequence, namely ...ABAB... and ...ABCDABCD....
Abstract Low molecular, water‐soluble chitosan (LMWSC) with a free amine group was prepared by the novel salts‐removal method described in this study. A weight‐average molecular weight and degree of deacetylation (DDA) of LMWSC were determined by viscometry and Kina titration, resulting in 18,579 Da and 93% DDA, respe…
The hydrothermal reaction of Ln(2)O(3) (Ln = Dy and Ho), Cu(OAc)(2).2H(2)O, and oxydiacetic acid in the approximate mole ratio of 1:3:8 resulted in the formation of two new members of the isostructural series of polymers formulated as [(Cu(3)Ln(2)(oda)(6)(H(2)O)(6)).12H(2)O](n), crystallizing in the hexagonal crystal…
Abstract Blend films of silk fibrion (SF) and poly(vinyl alcohol) (PVA), with glycerin as an additive, were made, and the structure and properties of the blends were investigated by scanning electron microscopy (SEM), Fourier transform infrared (FT‐IR) spectroscopy, differential scanning calorimetry (DSC), and wide‐an…
The effects of hydrogen on the ground-state electronic and magnetic structures of ${\mathrm{AB}}_{2}$ (A=Zr; $B=\mathrm{V},$ Cr, Mn, Fe, Co, Ni) Laves phase compounds were investigated by first-principles local-density-functional calculations. We calculated the relative stability of atomic hydrogen at various intersti…
Abstract A triamine monomer, 1,3,5‐tris(4‐aminophenoxy)benzene (TAPOB), was synthesized from phloroglucinol and 4‐chloronitrobenzene, and it was successfully polymerized into soluble hyperbranched polyimides (HB PIs) with commercially available dianhydrides: 4,4′‐(hexafluoroisopropylidene)diphthalic anhydride (6FDA),…