Materials Literature
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Abstract The chain entanglement states in high density, linear low density, and low density polyethylenes (HDPE, LLDPE, and LDPE) have been modified by recovering the polymers from solutions in trichlorobenzene (TCB) and p ‐xylene. In the thermodynamically good solvent, TCB, the entanglement density is assumed to be s…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpontaneous and rapid polymerization of plasma-exposed monomer crystals in liquid phaseYoshihito Osada and Akira MizumotoCite this: Macromolecules 1985, 18, 2, 302–304Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue 1 F…
The crystallographic groups play an important role in solid state physics, where their representations are of particular interest. In this paper we classify the kernels of all possible representations by deriving necessary and sufficient conditions for a subgroup H of a crystallographic group G to be invariant. The st…
Abstract [NiL3]Cl2·H2O, [NiL2(H2O)2]Br2, and [NiL2(NCS)2] (L=1,4-butanediamine) have been synthesized and their thermal investigations have been carried out. [Ni2L3Cl4], [NiLCl2], [Ni4L3Br8], and [NiL(NCS)2] have been synthesized pyrolytically in solid phase by temperature arrest technique from their corresponding par…
Optical excitation and emission spectra are reported for the Cs2NaErCl6 system under variable-temperature (8.5–298 K) conditions. Detailed line assignments are made for the 4I15/2←4S3/2 and 4I15/2←4F9/2 high-resolution emission spectra, and all five crystal-field levels split out of the 4I15/2 ground multiplet are loc…
An elastic viscoplastic constitutive equation for steels at high temperature is calibrated on a set of torsion tests performed by IRSID for different temperatures, strain rates and steel qualities. The integration of this equation in a computer code is examined and results for strip hot‐rolling are given.
Data on corrosion of metals are normally derived from two sources, namely, immersion/exposure tests and controlled electrochemical experiments. Because of inherent problems associated with the extrapolation of short-term measurements to long-term performance, many field workers are skeptical of the value of electroche…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeuterium NMR spectroscopic studies of low-valent iron porphyrin speciesDavid L. Hickman, Ataollah Shirazi, and Harold M. GoffCite this: Inorg. Chem. 1985, 24, 4, 563–566Publication Date (Print):February 1, 1985Publication History Published online1 May 2002Published inissue…
The use of monoclinic ZrO 2 as an additive improves the mechanical properties of TiB 2 ‐based composites without the use of stabilizers. In particular, TiB 2 ‐30% ZrO 2 compacts exhibited a transverse rupture strength of 800 MN/m 2 , few pores, and a K I c of 5 MPa·m 1/2 . The high strength and toughness are thought t…
Fundamental characteristics of a photoelectrochemical cell using p‐type porous‐Si layer (PSL) as a semiconductor photoelectrode were measured. The PSL electrode exhibited stable photodiode characteristics. The increase in the PSL thickness was very useful in suppressing the dark current, although it resulted somewhat…
Critical-point drying and freeze drying were compared both quantitatively and qualitatively as preparative procedures for scanning electron microscopy. Isolated hepatocytes were used as model cells. Nomarski differential interference contrast microscopy was used for light microscopic measurements of the hepatocytes in…
We examined the colloid materials in two Spodosols (Tihoi and Mangorewa) and two Andepts (Taupo and Oturoa) formed from the same volanic ash beds, using a combination of chemical and instrumental techniques. The dominant colloid material in all horizons of the Vitrandepts was allophane, except for the A horizon of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStoichiometry and kinetics of base-promoted disproportionation with concomitant ligand oxidation of tetracyano(1,2-diamine)ferrate(III)Masafumi Goto, Michihiro Takeshita, Noriyuki Kanda, Tomoya Sakai, and Virgil L. GoedkenCite this: Inorg. Chem. 1985, 24, 4, 582–587Publicati…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical reduction and reoxidation accompanied by reversible geometric isomerization. Electrochemistry of bis(dicarbonyl-.mu.-di-tert-butylphosphidorhodium). Isolation and x-ray crystal structure of bis(tetra-n-butylammonium) bis(dicarbonyl-.mu.-di-tert-butylphosphido…
Since its first appearance in 1954, polypropylene (PP) has become one of the most important commodity polymers. Among the outstanding properties of polypropylene are: low density, high melting point (167°C), high tensile strength, great rigidity, better stress crack resistance than high density polyethylene, and high…
Closed formulas are given for the calculation of the orientation matrix and the angles for a given reflection in a `z-axis' diffractometer geometry. These equations are derived for the conditions where the angle of incidence of the primary beam to the surface of the crystal is specified. Comparison is made with the st…
Crystalline silver( III ) oxide , which is stable over prolonged periods at −20°C, was obtained by anodic oxidation of AgClO 4 , AgBF 4 or AgPF 6 (not AgNO 3 ) in aqueous solution. The oxide of definite composition Ag 2 O 3 was hitherto unknown. It arouses interest as a possible component of the anodes in zinc/silver…
The reaction of zinc octaethylporphyrin with N 2 O 4 in dichloromethane gives, in a stepwise reaction, the zinc complexes of mono-, di-, tri-, and tetra-nitrooctaethylporphyrins. Demetallation, under acidic conditions, gives the corresponding free base porphyrins. The meso-nitro groups exert both steric and electronic…
The corrosion processes occurring in archaeological iron artifacts are discussed in the light of published measurements of electrode potentials and pH, and the relevance of this to the selection of conservation procedures is considered. In particular it is concluded that wet anaerobicstorage of ironwork should be succ…
<div class="htmlview paragraph">In die cast applications, high purity AZ91 alloy has been shown to result in parts with salt water corrosion performance that is 10 to 100 times better than the standard purity alloy. Two major concerns with regard to the continued development of the alloy have been resolved in th…