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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReevaluation of the dynamic model for rotational diffusion of thin, rigid rods in semidilute solutionG. T. Keep and R. PecoraCite this: Macromolecules 1985, 18, 6, 1167–1173Publication Date (Print):June 1, 1985Publication History Published online1 May 2002Published inissue 1…
Abstract Two coupling agents based on trichloro‐s‐triazine with different terminal unsaturated groups were synthesized in order to improve the bonding between cellulose fibers and an unsaturated polyester matrix. The products of the reactions between hydroxyl groups of cellulose and reactive species of coupling agents…
Abstract Eisen(II)‐Komplexe des Typs 1 wurden mittels verschiedener Synthesemethoden dargestellt. Im Gegensatz zu ähnlichen Chelaten des „saloph”︁ und „salen”︁ Typs bilden die high‐spin‐Komplexe 1 stabile high‐spin Diaddukte ( 1a – 1d ) und ein ungewöhnliches Triaddukt ( 1e ) mit Pyridin. Die Oxydationspotentiale Fe I…
The experimentally determined extinction spectra of colloidal hematite, consisting of spherical particles of 0.10, 0.12, 0.13, 0.15, 0.16, and 0.51 microm in modal diameter, respectively, are compared with the corresponding theoretically calculated spectra using the Lorenz-Mie theory. These spectra are most sensitive…
The stability and solubility of complexes formed between AlIII , FeIII and an epicatechin dimer (B2) and an epicatechin polymer or tannin (T) have been studied. Polyphenols such as these could be active in mobilizing iron and aluminium in organic soils; they have the potential to act as bis-catecholate ligands toward…
Localized surface condensations affect microbial stability of intermediate moisture foods (IMF). Two surface modifications previously reported were tested for their ability to improve microbial surface stability; control of surface preservative concentration and reduced surface pH. The effectiveness of a high surface…
Abstract 13 C and 29 Si nuclear magnetic resonance spectroscopy with magic-angle spinning bas been used to study the short-range ordering and bonding in the structures of intercalates of kaolinite with formamide, hydrazine, dimethyl sulfoxide (DMSO), and pyridine- N -oxide (PNO). The 29 Si chemical shift indicated dec…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation P. Palffy‐Muhoray, J. R. de Bruyn, D. A. Dunmur; Phase behavior of binary nematic liquid crystal…
Abstract The goal of primary interest in these investigations was the development of novel methods for preparing elastomeric networks having unusually good ultimate properties. The first technique employed involves endlinking mixtures of very short and relatively long functionally‐terminated chains to give bimodal net…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of chain length dependence of termination rate constant on the kinetics of free-radical polymerization. 1. Evaluation of an analytical expression relating the apparent rate constant of termination to the number-average degree of polymerizationHadi K. MahabadiCite thi…
Planarization of multilevel interconnection is most effective for achieving a higher packing density. However, it is shown by computer simulation that degradation of metallization step coverage becomes serious as the via aspect ratio increases. Conventional deposition methods, in which emitted particles flow onto the…
The relationship between the optical gap and chemical composition in chalcogenide glasses is discussed in terms of the average heat of atomization and the average coordination number. These are computed from the heats of atomization and the coordination number of the elements, respectively.
Abstract The esterification of a carboxy group terminated vinylpyrrolidone oligomer with chloromethylstyrene under mild conditions resulted in a styryl terminated oligovinylpyrrolidone macromonomer. The purity of the obtained macromonomer was greater than 95%. Copolymerization of the macromonomer with styrene in ethan…
Abstract A general synthetic method and characterization of bis(ether anhydride)s, the ether containing aromatic dianhydrides of the following structure, are presented. magnified image The method involves aromatic nitro‐displacement of N ‐substituted 3‐ or 4‐nitrophthalimide with bisphenoxides to form N ‐substituted a…
Glasses synthesized in the system Na 2 0‐B 2 0 3 −SiO 2 were studied by high‐temperature (974 K) solution calorimetry. The sign of the heats of mixing along four joins in the ternary reflects the presence or absence of glass‐glass immiscibility. Calculations of binary phase diagrams using thermochemical data and a con…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrocatalysis at redox polymer electrodes with separation of the catalytic and charge propagation roles. Reduction of dioxygen to hydrogen peroxide as catalyzed by cobalt(II) tetrakis(4-N-methylpyridyl)porphyrinFred C. Anson, Ching Long Ni, and Jean Michel SaveantCite thi…
Abstract New soluble aromatic polyamides with inherent viscosities of 1.0–1.7 dL/g were prepared by the low temperature solution polycondensation of 2,5‐bis(4‐aminophenyl)—3,4‐diphenylthiophene, bis(4‐aminophenyl) ether, and aromatic diacid chlorides in N , N ‐dimethylacetamide. The polyamides and copolyamides are gen…
Analyses of high-resolution neutron powder diffraction data, using both the Pearson VII and pseudo-Voigt peak shape functions, have revealed a range of peak shapes from essentially Gaussian to Lorentzian and beyond. Moreover, the refinements show that the Lorentzian character of the peaks in each pattern increases wit…
Abstract Hydroxide and oxyhydroxide products of aluminum were formed at room temperature at an initial Al concentration of 2 × 10 -3 M, pH 8.2, and at varying concentrations of organic and inorganic ligands commonly found in nature. The effectiveness of the ligands in promoting the formation of noncrystalline products…
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