Materials Literature
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Abstract A series of polyurethane elastomers were studied in which the soft segment composition was a molecular weight advanced poly(ethylene ether carbonate)diol (2025 mol wt) and the hard segment composition was based on MDI/1,4‐butanediol. These polyurethane elastomers had a constant soft segment composition and bl…
Polysilazane‐derived ceramic coatings in the form of thin films (0.1 to 4 μm) — fabricated by dipcoating soda‐lime rods with preceramic polymer solutions, followed by pyrolysis — increased the strength of the glass rods. Strengths up to 414 ± 57 MPa were obtained, 2.3 and 3.3 times higher than the strengths of uncoate…
La or Ce 3 d - and 4 d -core photoemission spectra are discussed for La and Ce compounds on the basis of the impurity Anderson model taking into account the atomic multiplets due to electron-electron interaction. A consistent explanation of 3 d and 4 d XPS of La and Ce compounds is presented. We also give an interpret…
ESR and optical absorption spectra have been recorded for a frozen dimethylformamide (DMF) solution of the complex FeIIIOEP(-OH)(-OOH)(OEP = octaethylporphyrinato) prepared by mixing FeIIOEP(pyridine)–O2 with ascorbic acid sodium salt.
22% Cr-3% Mo duplex stainless steels in which Ni and N contents were varied independently were prepared and base metal and TIG weld metal were subjected to pitting corrosion tests in 6% FeCl3. The critical pitting temperature at which pitting corrosion occurred was evaluated and the pitting site was observed. The pitt…
Abstract Experimental data for the dependence of the specific volume on temperature and pressure (PVT data) of a polydimethylsiloxane fluid with 100 cS viscosity are presented. The temperature range covered is 30–344°C and the pressure range is 0–200 MPa (0–29,000 psi). Coefficients for an empirical equation of state…
Abstract A series of high molecular weight, linear polyamide samples have been subjected to various solution spinning techniques, such as gel, wet, and dry spinning, in an attempt to produce high‐tenacity filaments. The spinning experiments involved polyamide 6, polyamide 12, and copolymers thereof, with a molecular w…
Abstract The cationic polymerization of cardanol using borontrifluoridediethyletherate as initiator has been investigated by gel permeation chromatographic techniques. The molecular weight and molecular weight distribution of the polymer at different temperatures and various initiator concentrations were studied, and…
CuI is known to undergo two phase transitions at T 1 = 367°C and T 2 = 407°C. The structural changes involve a rearrangement of the anions and disordered distributions of the cations. The low temperature γ -phase has zincblende structure, space group F [unk]3 m [ a = 6.0337(3) Å, Z = 4]. The intermediate β -phase belo…
It has been shown that increasing bacterial iron concentration enhances killing by hydrogen peroxide (H2O2) but not by polymorphonuclear granulocytes (PMN). It is possible that owing to the multiple bactericidal mechanisms of the PMN, differences in the killing rate of iron-loaded bacteria and control bacteria are obs…
Description STP 1030 provides the insulation community with an update on residential, commercial, and industrial application. Includes 50 papers on new materials assessments and properties of foams, properties and models, loose-fill behavior, systems performance testing, building applications and user interests, and i…
Abstract Treatment of cotton cellulose with 3 M sodium hydroxide solution at 260°C and 280°C gave a mixture of carboxylic acids with a yield of > 95%. The identified 50 carboxylic acids included both hydroxy monocarboxylic acids and dicarboxylic acids; their routes of formation are discussed. Among the main compoun…
Polystrene modification of chemical resistance modification of impact properties - of average density and thermoinsulating properties - of durability - of flammability - of electrical conductivity - of rheological properties - of strength characteristics - of heat resistance.
The Plasticity of single crystals of MgSiO 3 perovskite was studied (at room temperature) by the microhardness tests using a Vickers and a Knoop indenter. The Vickers hardness, H v , of MgSiO 3 perovskite was determined to be 18 +/− 2 GPa, about a factor of two larger than the hardness of either enstatite or olivine,…
Vacuum UV circular dichroism spectra measured down to 178 nm for hexameric 2-zinc human insulin, zinc-free human insulin, and the two engineered and biologically active monomeric mutants, [B/S9D] and [B/S9D,T27E] human insulin, show significant differences. The secondary structure analysis of the 2-zinc human insulin…
Crystal structures of di- and tri-nuclear palladium(II) complexes with the azamacrocycles[18]aneN6 and [21]aneN7 have been solved by X-ray analysis; in the case of the trinuclear complex deprotonation of a secondary amino group occurs, both in solution and in the solid state.
Abstract Magnesium and magnesium alloys are used in a wide variety of structural and nonstructural applications. This article provides information on selection and application of magnesium and magnesium alloys, mainly, casting alloys and wrought alloys. It also provides tabulated data for the composition, properties o…
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
Abstract When starch was treated with KMnO 4 solution, MnO 2 was deposited overall the starch. The amount of MnO 2 deposited relied on the KMnO 4 concentration. Subjecting the MnO 2 ‐containing starch to a solution consisting of monomer (methacrylic acid, MAA) and acid (citric, tartaric, oxalic or sulphuric acid) resu…
The preparation of racemic and optically active glyceric acid de rivatives as suitable precursors for the formulation of a new class of bioerodible and/or biodegradable polymers is described. Details are provided for the prepa ration of chiral 3-0-alkyl substituted methyl glycerates and on their potential to form the…