Materials Literature
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The inhibition of aluminium corrosion in solutions of hydrochloric acid or sodium hydroxide has been studied using weight-loss and hydrogen evolution methods. Benzoic acid and its derivatives inhibit acidic and alkaline corrosion effectively. The efficiency of inhibitors increases in the order: benzamide < benz…
In order to determine whether or not starting a test in ramp loading has an effect on the fatigue mechanism when the test is continued in constant stress or strain, polycrystalline copper specimens have been cycled to failure in load or strain control, with and without initial ramp loading. The failure mechanisms were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion motions and microphase separation of styrene-butadiene diblock copolymer in solution. 1. Extremely dilute solution regionYoshisuke Tsunashima, Masukazu Hirata, and Yukinao KawamataCite this: Macromolecules 1990, 23, 4, 1089–1096Publication Date (Print):February 1,…
Abstract Glauconites in early ankerite concretions, ferroan calcite-cemented sandstones, and uncemented sandstones in the first Wilcox sandstone of the Lockhart Crossing field, Livingston Parish, Louisiana, show a progressive substitution of Fe for octahedral Al with increasing diagenesis. An octahedral Fe content of…
PBI (polybenzimidazole) is a thermally stable high performace polymer. In a variety of forms, e.g. fibers, neat resin and composites, PBI finds use in a wide range of high temperature applications. The synthesis of PBI, and properties, and applications of fiber and molded resin are discussed. Also included are recent…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of mesophase transitions in thermotropic copolyesters. 3. Poly[(phenyl-p-phenylene terephthalate)-co-[(1-phenylethyl)-p-phenylene terephthalate]] copolyesterStephen Z. D. Cheng, Anqiu Zhang, Ronald L. Johnson, Zongquan Wu, and Hak Hung WuCite this: Macromolecules 19…
Abstract CaCu 2 As 2 (I4/mmm, a = 412,9(1) pm, c = 1 025,1(1) pm, Z = 2) kristallisiert im ThCr 2 Si 2 ‐Typ, die Cu‐Punktlage ist wie bei dem isotypen Phosphid unterbesetzt. Die Struktur von Ca 2 Cu 6 P 5 (I4/mmm, a = 410,5(1) pm, c = 2 465,7(2) pm, Z = 2) besteht aus drei übereinander gestapelten Blöcken des ThCr 2 S…
The square‐pyramidal structure is one reason for the intense color of pen‐taphenylbismuth and many of its derivatives, such as 1 . The easy electronic excitation is made possible, in this case, by a low‐lying LUMO, which is oriented toward the sixth coordination site of the octahedron. Noteworthy are the lack of shiel…
Polyphenylacetylene (PPA) is a variant of polymeric polyacetylene. Unlike polyacetylene, it is stable in air, which makes it easier to handle and investigate. Numerous studies have been conducted on this material. Syntheses have been made by different routes. Many catalysts have been used to achieve the polymerization…
Bismuth oxide has been found to be a useful flux for the preparation of dense body cordierite (Mg 2 Al 4 Si 5 O 18 ). The addition of as little as 2 at.% of bismuth ion to the appropriate stoichiometric mix of commercially available oxide starting materials gives fully dense cordierite after firing for 12 h at 1000°C.…
In this paper we have studied the atomic structures of (111) twist boundaries and investigated the applicability of the structural unit model which has previously been established for tilt boundaries and (001) twist boundaries by Sutton and Vitek. The calculations were carried out using two different descriptions of i…
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Abstract The use of water‐miscible organic solvents such as 2‐propanol, 2‐methyl‐2‐propanol and acetone in the alkaline deacetylation of chitin was examined. Using such diluents enables adequate deacetylation to be obtained with much smaller volumes of alkali, typically 1,5 cm 3 50 wt.‐% aq. NaOH per 1 g of chitin, al…
Polyurethane elastomers [1] are linear block copolymers of the type in which one of the two blocks is typically a polyether or a polyester diol with a molar mass between 300 to 6000. These blocks comprise the soft segments because at the service temperature they exist in a rubbery or a viscous state and impart elastom…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe molecular structure of low-density polyethylene. 1. Long-chain branching and solution propertiesE. Nordmeier, U. Lanver, and M. D. LechnerCite this: Macromolecules 1990, 23, 4, 1072–1076Publication Date (Print):February 1, 1990Publication History Published online1 May 20…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSemiconductor photophysics. 5. Charge carrier trapping in ultrasmall silver iodide particles and kinetics of formation of silver atom clustersO. I. Micic, M. Meglic, D. Lawless, D. K. Sharma, and N. SerponeCite this: Langmuir 1990, 6, 2, 487–492Publication Date (Print):Febru…
New X-ray diffraction measurements of a well-ordered Roc Tourn6 low albite (space group Cl) were refined in a variety of models. In addition, structural data for other low albites obtained from room-temperature X-ray and neutron diffraction refinements were retrieved from the literature. Comparison of refined structur…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidative polymerization of diphenyl disulfides with quinones: formation of ultrapure poly(p-phenylene sulfide)sEishun Tsuchida, Kimihisa Yamamoto, Mitsutoshi Jikei, and Hiroyuki NishideCite this: Macromolecules 1990, 23, 4, 930–934Publication Date (Print):February 1, 1990Pu…
Solid solutions of 2H ‐SiC/AlN can be prepared at temperatures less than 1600°C by rapid pyrolysis (“hot drop”) of mixtures of [(Me 3 Si) 0.80 ((CH 2 =CH)MeSi) 1.0 (MeHSi) 0.35 ] n (VPS) or [MeHSiCH 2 ] n (MPCS) with [R 2 AlNH 2 ] 3 , where R=Et, i ‐Bu or simply by slow pyrolysis of the precursor mixture in the case o…
A light-scattering study of the low-frequency excitations in single crystals of cubic and tetragonal ${\mathrm{KTa}}_{1\mathrm{\ensuremath{-}}\mathrm{x}}$${\mathrm{Nb}}_{\mathrm{x}}$${\mathrm{O}}_{3}$ (x=0.26 and 0.28) has been carried out by employing a technique which uses an Iodine filter to remove elastically scat…