Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTScaling theory of molten polymers in small poresF. Brochard-Wyart and E. RaphaelCite this: Macromolecules 1990, 23, 8, 2276–2280Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 April 1990https://pubs.acs.org/doi/10.1021/…
Abstract Clay fractions separated from the A2, B, and C horizons of a soil formed on granite gneiss showed X-ray powder diffraction (XRD) spacings characteristic of trioctahedral illite. The trioctahedral illite was derived from biotite, and its development through various stages of weathering was followed by optical…
K 2 [ReCl 6 ] (I), a 120 K, cristallise dans Fm3m, avec a=9,7958 A, Z=4; affinement jusqu'a R=0,0219. K 2 [OsCl 6 ] (II), a 120 K, cristallise dans Fm3m, avec a=9,7195 A, Z=4; affinement jusqu'a R=0,0194. K 2 [PtCl 6 ] (IIIa, b) cristallise dans Fm3m, avec (IIIa) a=9,6911 A, Z=4; affinement jusqu'a R=0,0159; (IIIb) a=…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluoroorganometallic chemistry: decarbonylation of cyclic perfluoroacyl complexesKarin J. Karel, Thomas H. Tulip, and Steven D. IttelCite this: Organometallics 1990, 9, 4, 1276–1282Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published…
The overall folding of neutral protease from Bacillus subtilis has been predicted by computer-aided modelling, taking as a basis the known three-dimensional structure of thermolysin. As expected from the 50% similarity of sequence between the two proteins, the structure of B. subtilis protease is similar to that of th…
Cristallisation a 773 K dans R3m avec a R =7,519 A, α=89,32°, Z=1; a H =10,561, c H =13,199 A, Z=3, affinement jusqu'a R=0,047. Transformation de phase a 748 K. Discussion des deux formes respectivement de haute temperature et de basse temperature
The structure of a Lennard-Jones fluid in a narrow planar slit is studied for different kinds of wall–fluid interaction potentials by applying anisotropic integral equation theories. Density profiles and in some cases the force between the walls as a function of the slit width are calculated. It is found that when the…
Reduktion kondensierter Arene mit ‐Boranen. – Partielle Hydrierung: Anthracen bis Coronen Tetrapropyldiboran(6) (TPDB) katalysiert die Hydrierung polycyclisher Arene [z. B. Anthracen ( A ), Tetracen ( TET ), Pyren ( PY ), Perylen ( PER ) oder Coronen ( C)] unter Wasserstoff‐Druck bei 200°C. In einigen Fällen können se…
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…