Materials Literature
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Abstract Lepidocrocite samples, γ-FeOOH, containing 0–10 mole % Al-for-Fe substitution were synthesized at 15°C and pH 8 by oxidizing mixed FeCl 2 -AlCl 3 solutions. The unit-cell parameters a, b , and c were measured from step-counted X-ray powder diffractograms using seven lines and Si as an internal standard. With…
Stitching has been found to be able to improve the interlaminar strength of composite laminates. Its application as composite joining has been also explored. This study examined the tensile strength of some stitched composite beams made of woven glass fabric and epoxy matrix. The effects of stitching parameters on joi…
Abstract Hydroquinone is electro-oxidatively polymerized to poly(dihydroxyphenylene) on the Pt electrode, whose structure was confirmed by spectroscopic measurements. The polymerization proceeds via an oxidative and cationic mechanism. The poly(dihydroxyphenylene) thus formed is a Nernstian-type electro-active polymer…
Abstract The cure kinetics of two different diepoxy prepolymers and their mixtures with a single diamine was analyzed using size exclusion chromatography (SEC). One of the diepoxy prepolymers was based on bisphenol‐A diglycidyl ether (DGEBA), while the other one was the diglycidyl ether of 1,4‐butanediol (DGEBD), whic…
1,3,2‐Dithiazol‐2‐yl Radicals from N‐Substituted 1,3,2‐Dithiazoles Thermolysis of N ‐substituted 1,3,2‐dithiazoles 1,2 as well as their reactions with bases affords the corresponding 1,3,2‐dithiazol‐2‐yl radical 3, 4 . Radical 3 has been characterized by X‐ray structure analysis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTResonance Raman spectra of reaction intermediates in oxidation process of ruthenium(II) and iron(II) porphyrinsInsook Rhee Paeng and Kazuo NakamotoCite this: J. Am. Chem. Soc. 1990, 112, 9, 3289–3297Publication Date (Print):April 1, 1990Publication History Published online1…
Abstract Polarized IR spectra of partially oriented benzimidazole crystals grown from the melt pressed between salt plates were recorded. The depolarization ratios of the Raman bands in the melt and polarized Raman spectra of a single crystal in all possible orientations were measured. The experimental assignment of t…
Abstract In heat‐treated polyamide 6 and polyamide 6,6 fibres UV/VIS‐active chromophores are found, which originate from two different sources: one type of chromophore (structured UV spectrum) arises during polycondensation and the spinning of the fibres (molten phase), the other (nonstructured UV spectrum) occurs as…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymerization of diphenyl disulfide by the S-S bond cleavage with a Lewis acid: a novel preparation route to poly(p-phenylene sulfide)Eishun Tsuchida, Kimihisa Yamamoto, Hiroyuki Nishide, Shu Yoshida, and Mitsutoshi JikeiCite this: Macromolecules 1990, 23, 8, 2101–2106Publi…
Abstract A new type of preparing method of submicron scale porous conducting materials was demonstrated. A microporous structure of anodic alumina film was replaced with metal by using a two step molding technique. The procedure and condition of the fabrication process of the porous film was described.
Irrespective of chain length and configuration, polyols are subject to base-catalyzed migration of a tert-butyldiphenyl protective group from a secondary to a primary position. Such a migration occurs as a sequence of 1,2 shifts, and can therefore be prevented by the interventin of methyl branching; e.g., 1a → 2 ← 1b.
Square cross-sectional holes with widths of about 1 nm can be formed in MgO crystals using circular cross-section high-current-density electron probes which are focused and oriented close to <001>. High-resolution scanning transmission electron microscopy has been used to reveal, on a unit cell scale, the three-dimens…
Attenuation of dopamine surface-enhanced Raman scattering (SERS) spectra at silver electrodes by protein adsorption is described. Polymer-modified electrodes eliminate protein adsorption effects. Partially hydrolyzed cellulose acetate coatings prevent protein adsorption and allow transport of dopamine to and from the…
The self-diffusion coefficients of b.c.c. metals are analysed assuming a two-defect model and different one-defect models. The two-exponential fits reveal large error limits for the diffusion parameters. Only for V, Nb and Na are highly accurate monovacancy diffusion energies evaluated. The analysis shows that for the…
It is becoming clear that the activity of the hydrogenase enzyme may be involved in the anaerobic biocorrosion of metal, particularly mild steel. Since all hydrogenases appear to be active in the reversible activation of the hydrogen molecule, hydrogenase from Clostridium pasteurianum was used as a test enzyme for inv…
Abstract This study examines the influence of different cellulose treatments, including coating by latex or by grafting with polymer/vinyl monomers, as well as with various additive dispersants (e.g., stearic acid or anhydrides) and coupling agents (e.g., maleic anhydride, abietic acid, and linoleic acid). The mechani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA general synthetic route to 2,2':5',2''-terpyrrole, 2,5-di(2-pyrryl)thiophene, and alkyl-substituted analogsBryon A. Merrill and Eugene LeGoffCite this: J. Org. Chem. 1990, 55, 9, 2904–2908Publication Date (Print):April 1, 1990Publication History Published online1 May 2002P…
The Gibbs simulation technique has been extended to calculate the phase equilibria of fluids of particles exhibiting variable polydispersity, such as micellar solutions. The density-temperature sections of the phase diagrams and the distribution of particle sizes in the coexisting phases have been calculated for two v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectroscopic characterization of lanthanide octaethylporphyrin sandwich complexes. Effects of strong .pi..pi. interactionJohn K. Duchowski and David F. BocianCite this: J. Am. Chem. Soc. 1990, 112, 9, 3312–3318Publication Date (Print):April 1, 1990Publication History Publis…
The etching of (100)‐oriented n‐type silicon in solutions at 70°C was studied by kinetic and electrochemical measurements. In solutions with a concentration below etching is observed, while dissolution is inhibited when the concentration exceeds this critical value. In the latter case the silicon surface attains a pot…