Materials Literature
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Abstract A negative‐type photosensitive polyamic acid (PAA) was synthesized from cyclobutane‐1,2,3,4‐tetracarboxylic dianhydride and 2‐(methacryloyloxy)ethyl 3,5‐diaminobenzoate in N ‐methyl‐2‐pyrrolidinone. Glycidyl methacrylate was added into the PAA solution to yield a photosensitive PAA ester (PAE) by the ring‐ope…
Plasma-based ion implantation (PBII) allows the formation of diamond-like carbon (DLC) films with excellent tribological properties. A large number of examples from the literature are discussed in detail, and the process parameters of PBII, such as plasma-forming gas, bias voltage, pulse length, pulse repetition rate…
Partielle Protonierung eines Silicodecawolframats vom Keggin-Typ mit zwei Leerstellen in einem wasserfreien organischen Solvens bewirkte eine dehydratisierende Kondensation und die Bildung eines neuartigen S-förmigen Disilicoicosawolframats (siehe Bild). Der S-förmige Cluster vermittelt die Baeyer-Villiger-Oxidation v…
Abstract The curing reaction between the diepoxy and dicyanate mixed resins in the presence of three different catalysts Cu(AcAc) 2 , manganese octoate, and copper octoate was investigated. The thermal behavior was monitored using differential scanning calorimeter; the transformations of structures during the isotherm…
Polypyrrole films were electrodeposited at pure aluminium from aqueous solution of sodium sulphate containing pyrrole and organic compounds as dopants. Substrate-adherent polypyrrole films were obtained by electrochemical oxidation of pyrrole using the potentiodynamic method and cycling the electrode potential from 50…
Abstract A structure of a new inclusion compound of bis-thiourea pyridinium nitrate salt C 5 H 6 N + NO 3 - 2[CH 4 N 2 S] was determined by single-crystal X-ray diffraction method at 293 K, 250 K and 150 K. In high temperature phase the compound crystallizes in orthorhombic system, the two low-temperature phases are m…
The effect of Ru crystal orientation on the deposition behavior of chemical vapor deposition (CVD) Cu was investigated. The crystal orientation of Ru films was modulated by adjusting sputtering temperature. Ru(001) and random orientation films were obtained by sputtering at 300 °C and room temperature, respectively. C…
Abstract This paper reports synthesis and characterization of polyurethane–urea (PU‐urea) and the nanocomposites derived from the PU‐urea with silicate clays. Organophilic montmorillonite cotreated by cetyl trimethyl ammonium bromide (CTAB) was synthesized and used to prepare PU‐urea/montmorillonite nanocomposites coa…
Accurate first principles calculations were performed to predict the optical and magneto-optical properties of a large set of Heusler compounds. The optical properties are explained in terms of relevant transitions from the underlying band-structure, suggesting that the joint density of states plays a role in shaping…
Abstract The morphologies of a ternary blend of nylon 66 and polystyrene in a polypropylene matrix with and without compatibilization by an ionomer resin (for nylon 66) and a styrene‐ block ‐ethylene‐ co ‐butylene‐ block ‐styrene (SEBS) copolymer (for polystyrene) were investigated by transmission electron microscopy…
Abstract Poly(4‐methyl‐1‐pentene) (PMP) hollow fibers were prepared and fabricated into gas separation or microporous membranes by the melt‐spun and cold‐stretched method. PMP resin was melt‐extruded into hollow fibers with cold air as the cooling medium. The effects of take‐up speed and thermotreatment on the mechani…
The understanding of the structural origin of relaxor ferroelectrics has been doubtlessly a long-standing puzzle in the field of ferroelectricity. Thus, motivated by the interest in improving the comprehension of this important issue, it a framework is proposed for explaining the origin of the relaxor state in ordinar…
Abstract Graft copolymer of N‐ vinyl‐2‐pyrrolidone with guar gum was synthesized and its reaction conditions were optimized for better yield using potassium peroxymonosulfate (PMS) and glycolic acid (GA) as a redox initiator. The effect of PMS, GA, hydrogen ions, guar gum, and N‐ vinyl‐2‐pyrrolidone (NVP) along with r…
As known, the magnetic properties of AGCMs are determined by the radial, azimuthal and axial internal stresses induced during both the preparation process and the suitable thermal treatments of these microwires. In this paper we have proposed a theoretical model in order to determine the total internal stresses induce…
Abstract Different rubber formulations were designed using nitrile rubber and a mixed crosslinking system consisting of sulfur/accelerator and electron beam radiation. Based on the experimental results, an artificial neural network (ANN) was constructed to simulate the mechanical properties and volume fraction of rubb…
Abstract The method of boroorganic compounds preparation by esterification of boric acid and glycols has been presented. The obtained compounds tri(2‐hydroxybutyl)borate, tri(hydroxythiodiethylene)borate, tri[(3‐chloro‐2‐hydroxy‐1‐propoxy)‐1‐methylpropyl]borate, and tri[3‐chloro‐2‐hydroxy‐1‐propoxy)thiodiethyl]borate…
The X-ray crystal structure of the At5g18200.1 protein has been determined to a nominal resolution of 2.30 A. The structure has a histidine triad (HIT)-like fold containing two distinct HIT-like motifs. The sequence of At5g18200.1 indicates a distant family relationship to the Escherichia coli galactose-1-P uridylyltr…
Fermi surface of a half-metal compound with cubic Fm–3m symmetry: Heusler alloy or double perovskite. The inset shows the spin resolved density of state for a CCFA Heusler compound. ( This illustration appears on the cover of the print edition. ) This cluster issue of Journal of Physics D: Applied Physics is devoted t…
Brazil is the only country in South America to have an automotive supplier sector based on natural fibers. New opportunities are arising due to an increase demand by the car makers in applying natural fibers in their parts. Several crop fibers have been developed in Brazil. Among them can be listed caroá, piaçava, pup…
Polycrystalline diamond synthesized using the chemical vapour deposition (CVD) technique can be used to fabricate new types of photodetectors for the characterization of X-ray light in synchrotron beamlines. Since diamond exhibits a low absorption to low-energy photons, such devices allow beam-position monitoring with…