Materials Literature
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In this article, the characterization of the microstructure and interface of hybrid composites is discussed. Poly(p-phenylene biphenyltetracarboximide) was used as a matrix polymer and tetraethoxysilane was a precursor of silica. Polyimide/silica hybrid composites were prepared by sol–gel reaction and thermal imidizat…
Preparative methods of polymers containing a silicon-oxygen bond in the main-chain are systematically summarized with emphasis on recent developments in the synthesis of polycarbosiloxanes, poly(silyl ether)s, and poly(silyl ester)s.
We performed feasibility tests of photoelectron emission spectromicroscopy of wet samples in the water window (285–532 eV) soft x-ray spectral region. Water was successfully confined in an ultrahigh vacuum compatible compartment with x-ray transparent sides. This water cell was placed in the MEPHISTO spectromicroscope…
Rare-earth iron nitrides are emerging as an important class of magnetic materials. In certain rare-earth iron compounds, the insertion of small atoms such as nitrogen and boron has resulted in significant changes in the magnetic properties in the form of higher Curie temperatures, enhanced magnetic moments, and strong…
The photophysical properties of water soluble Zn(II) meso-tetrakis(N-methylpyridinium-4-yl)-porphyrin were studied in reverse micelles of the iso-octane–AOT–water system. Broadening of absorption and emission bands as well as shifts and increase of maxima intensities were observed with different values of W0 = [H2O]/[…
General information about microarc oxidation (MAO) process and the influence of MAO on mechanical and corrosion-mechanical properties of titanium alloys was presented. The formation conditions, compositions, and physical-chemical characteristics of anticorrosion, antiscale, wear-resistant, and antiscuff coatings were…
The analytical expression of the phase profile of the optimum diffractive beam splitter with an arbitrary power ratio between the two output beams is derived. The phase function is obtained by an analytical optimization procedure such that the diffraction efficiency of the resulting optical element is the highest for…
We used 10-MeV electrons to rapidly produce radiation damage in zirconium alloys, investigated whether electrons produced the same microstructural changes as neutrons, then performed post-irradiation corrosion tests to determine whether electron-irradiated materials displayed similar corrosion behavior to neutron-irra…
The synthesis, microstructure, and thermal behavior of a series of poly(ethylene terephthalate) (PET) copolymers containing nitroterephthalic units are described. These novel copolyesters were synthesized by transesterification followed by melt copolycondensation of dimethyl terephthalate and dimethyl nitroterephthala…
The competition between thermal decomposition (kdis) and O2 addition (kO2) of linear and branched C4 and C5 alkanoyl (R-C(•)O, R=alkyl) radicals has been studied in a photochemical reaction chamber made from stainless steel (v=12 L). RCO radicals were prepared by continuous photolysis of Br2–RC(O)H–O2–NO2–N2 mixtures…
The functionalization of poly(butylene terephthalate) (PBT) has been accomplished in a twin screw extruder by grafting maleic anhydride (MA) using a free radical polymerization technique. The resulting PBT-g-MA was successfully used as a compatibilizer for the binary blends of polyester (PBT) and polyamide (PA66). Enh…
Lanthanum phosphate (LaPO4) powders with 1, 2 and 5 mol.% Sr substitution were prepared and sintered at 1450 °C. Bulk, grain boundaries and surfaces of different origins were investigated using powder x-ray diffraction (XRD), SEM, electron probe microanalysis (EPMA), transmission electron microscopy (TEM) and XPS in o…
Thermo-decomposition of precursor complexes was utilized to synthesize scandia-stabilized zirconia (ScSZ) with the composition (Sc2O3)0.08(ZrO2)0.92. Mixtures of precursors with different contents of EDTA (ethylenediaminetetraacetic acid) were synthesized through a homogenous soft chemical process, enabling the influe…
Parvalbumins constitute a class of calcium-binding proteins characterized by the presence of several helix-loop-helix (EF-hand) motifs. In a previous study (Revett SP, King G, Shabanowitz J, Hunt DF, Hartman KL, Laue TM, Nelson DJ, 1997, Protein Sci 7:2397-2408), we presented the sequence of the major parvalbumin isof…
A hyperbranched polyol with long flexible chains on the molecule surface was synthesized and characterized. The effect of the hyperbranched polyol as flexibilizer and chain-transfer agent on cationic UV curing was investigated. It was found the hyperbranched polyol could markedly improve the mechanical properties of c…
The potential dependence of the metal dissolution current density of aluminum in etch tunnels was measured, using pulsed increases of current during galvanostatic etching experiments. Etching was carried out in 1 N HCl solution at 65°C, and was followed by analysis of the topographic development of the dissolving surf…
Chlorinated poly(isoprene-coisobutylene) (CIIR or chloro-butyl) was characterized by Nuclear Magnetic Resonance. Compounds with ZnO, ZnCl2, and ZnO/ZnCl2 were vulcanized in a DSC at a programmed heating rate and isothermally at 150°C in a press. Crosslink densities were determined by swelling and extracted ZnCl2 analy…
Titanium dioxide, TiO2, being a prime pigment, has been used extensively in the paint industry. The growing demand and the increasing cost of TiO2 has driven the attention of paint technologists to search for other alternatives. There has been continuous effort to replace part of the TiO2 with a fine particle size ext…
Rubber ceramic composite, negative temperature coefficient of conductivity (NTCC) thermistors, are widely used in industry because of the high dependence of their electrical conductivity on temperature. The effect of iron oxide (Fe3O4) on the vulcanization process, DC conductivity, thermoelectric power, dielectric con…
The notion of a paracrystal is particularly well adapted to the calculation of the scattering interference function of distorted crystallographic lattices in which the long-range order does not exist. However, classical paracrystal modelling cannot be used directly for hexagonal lattices because it does not respect th…