Materials Literature
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<div class="htmlview paragraph">An Isotropic Superfinish (ISF) is produced by a patented chemically accelerated vibratory finishing process using non-abrasive media that is capable of surface finishing hundreds of parts per hour. Rolling/Sliding Contact Fatigue testing shows that this commercial technology virtu…
Abstract A new diimide–diacid monomer, N , N ′‐bis(4‐carboxyphenyl)‐4,4′‐oxydiphthalimide (I), was prepared by azeotropic condensation of 4,4′‐oxydiphthalic anhydride (ODPA) and p ‐aminobenzoic acid ( p ‐ABA) at a 1:2 molar ratio in a polar solvent mixed with toluene. A series of poly(amide–imide)s (PAI, III a–m ) was…
<div class="htmlview paragraph">Intensive quenching, known as IntensiQuench<sup>SM</sup>, is an alternative way of hardening steel parts developed by Dr. Kobasko of the Ukraine. It provides steel products with superior mechanical properties, creates high residual compressive stresses on the part surf…
Various graphite-like B–C–N materials were synthesized in the precursor pyrolysis system of boron trichloride and nitrogen-containing materials such as heptaazaphenalene derivatives, carbodiimides, amines, nitriles and cyanamides. The materials obtained were described with a formula of CNx(BN)y and CBx(BN)y consisting…
Abstract Standing on a hypothesis that the sharkskin of a polymer with a narrow molecular weight distribution at extrusion processing originates from a stick‐slip of the polymer at the die wall, the suppression of the sharkskin was tried by means of suppressing the slip by the addition of adhesives. To polypropylene (…
The total vapor pressure of HoCl 3, HoBr 3, and HoI 3 was measured by the torsion and Knudsen effusion methods. By a least-squares treatment of the obtained data, the following equations were selected as representative for the temperature dependence of their vapor pressures in the covered temperature ranges: HoCl 3 (s…
Abstract Two series of polypropylenes with different molecular weight distribution and tacticity characteristics were injection molded into flexural test specimens by varying cylinder temperature and the effects of the molecular weight distribution and tacticity on the structure and properties of the moldings were stu…
Abstract High‐temperature (180°C) molding of epoxidized natural rubber (ENR) filled with precipitated silica leads to chemical bond formation between epoxy groups of ENR and silanol groups of silica. The extent of chemical bond formation is further enhanced in the presence of the silane coupling agent N‐3‐N ‐(vinyl be…
NiMnSb(001) high-quality epitaxial thin films have been prepared by molecular-beam epitaxy. The growth and morphology of the films have been extensively studied using electron diffraction and scanning tunneling microscopy. We report the presence of various surface structures on the free NiMnSb(001) surface. The struct…
The synthesis of 4'-(C6H4-p-NBU2)-2,2':6',2" -terpyridine and the strongly enhanced second-order NLO response of its Zn(II), Ru(III) and Ir(III)complexes are reported, evidencing for the first time a shift from positive to negative value of the ligand quadratic hyperpolarizability by varying the nature of the metal ce…
Abstract Poly( N ‐methylaniline) thin films show different cyclic voltammetric behaviour when cycled in HClO 4 , HBF 4 , HCl or HNO 3 . While in the first two acids the film shows profiles peak potentials similar to those of polyaniline, profiles in HCl and HNO 3 show higher peak potentials for oxidation and a differe…
Abstract Bismuth triborate, BiB 3 O 6 (BiBO), a promising new material for effective frequency conversion, was synthesized by top‐seeded growth from the nearly stoichiometric melt at high temperature. The crystal space group is non‐centrosymmetric monoclinic C 2 with Z = 2. The lattice constants were a = 7.116(2), b =…
Abstract Studies were conducted on the effects of shear rate, viscosity ratio and liquid crystalline polymer (LCP) content on the morphological and mechanical properties of polycarbonate (PC) and LCP blends. The LCP (LC5000) used was a thermotropic liquid crystalline polymer consisting of 80/20 of parahydroxybenzoic a…
Abstract Amphiphilic AB‐type diblock copolymers composed of hydrophobic poly( L ‐lactide) (PLA) segments and hydrophilic poly(glycolic acid lysine) [poly(Glc‐Lys)] segments with amino side‐chain groups self‐associated to form PLA‐based polymeric micelles with amino surfaces in an aqueous solution. The average diameter…
Abstract Hybrids based on cellulose acetate (CA) and SiO 2 were prepared by hydrolysis of tetraethoxysilane (TEOS). More rigid films were obtained with an inorganic phase incorporation. The thermal stability of the hybrids was similar to pure CA. Composite membranes were prepared by casting of CA/TEOS mixtures onto a…
We have used a quantum-chemical method developed for crystal calculations to investigate self-trapped hole polarons in technologically important ${\mathrm{BaTiO}}_{3}$ perovskite-type crystal. The tetragonal structure of this material is considered in the present work. The computations are carried out in a self-consis…
Filter paper, loaded with catalyst precursor, is burned to generate catalyst nanoparticles for single-wall nanotube (SWNT) synthesis in a two-stage flame. A first-stage diffusion flame creates the Fe nanoparticles as an aerosol in the post-flame gases for catalysis. A second-stage flame is formed by the first-stage di…
Poly(dithienothiophene)s (PDTTs), low band-gap conjugated polymers with polythiophene-like chain where an aromatic thienothiophene moiety is fused to each thiophene ring, were studied using Raman spectroscopy, photoinduced infrared absorption, as well as attenuated total reflection Fourier transform infrared (ATR-FTIR…
We present the first report of hexagonally ordered mesostructured ternary metal tin sulfide materials along with their structure and optical properties. The new mesophases designated as (CP) x M y Sn 2 S 6 (M = Zn 2+, Cd 2+, Ga 3+ ) where synthesized by linking [Sn 2 S 6 ] 4- clusters with metal ions in the presence o…
Caged analogues of biologically active compounds have received widespread attention as temporally and spatially controlled probes of cell-based processes. Recently, a coumarin-4-ylmethyl derivative has been used to cage carboxylates, sulfonates, carbamates, and phosphates. We describe herein a synthetic strategy that…