Materials Literature
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Residual softwood sawdust was pretreated by a steam-explosion technique. It was used as a natural filler in polypropylene (PP)-based composites. Dynamic mechanical analysis and tensile properties of these materials were studied. The influence of filler loading, steam-explosion severity, and coating the fiber with a fu…
Guest desorption procedures for s-PS clathrate samples, leading to formation and regeneration of the nanoporous δ phase, are compared. An extraction procedure, based on supercritical carbon dioxide, allows an easy and fast recovery of the guest molecules operating under relatively mild conditions (90–200 bar, 40°C) an…
Oligomers were obtained from polyester samples by solvent extraction and dissolution methods. Dioxane, chloroform, and chlorobenzene were used for the extraction method, whereas dimethyl formamide and phenol : tetrachloroethane (1 : 1 mixture) were used for the dissolution method. The oligomers were separated and anal…
The bridging sulfido anions (μ-RS)(μ-S - ) [Fe 2 (CO) 6 ] 2 (μ 4 -S) ( 4a ) react with succinyl chloride in THF to give double and quadruple butterfly Fe/S clusters (μ-RS)(μ-RSS)[Fe 2 (CO) 6 ] 2 (μ 4 -S) ( 5a, R = Et; 6a, R = t-Bu) and [(μ-RS)Fe 2 (CO) 6 (μ 4 -S)Fe 2 (CO) 6 ] 2 (μ-S−S-μ) ( 5b, R = Et; 6b, R = t-Bu), u…
We examined the effect of the addition of homopolymers tetramethylbisphenol A polycarbonate, TMPC, and poly(norbornene−methyl- d 3 -carboxylate), NBMC, on the interlamellar spacing and the phase stability of symmetric poly(styrene- b -methyl methacrylate) diblock copolymer thin films on silicon substrates. The films w…
Solid-state deuterium NMR ( 2 H NMR) was used to study the dynamics of the tyrosine (Tyr) residue in silk fibroin from Bombyx mori ( B. mori ) and Samia cynthia ricini ( S. c. ricini ). Specifically deuterated cocoon silk was obtained by feeding silk worms with Tyr, labeled either at the C β carbon ([3,3- 2 H 2 ]Tyr)…
The synthesis and characterization of seven (Zn II ) 2 bis(porphyrin) molecules are described. The molecular structures of two bis(porphyrin)s ( 6 and 7 ) were determined by X-ray diffraction methods. Four of the compounds have their porphyrin moieties attached in a meta -fashion to a substituted benzene ring ( 1 − 4…
Polyaniline specimens, emeraldine sulfate, emeraldine hydrochloride, and emeraldine base, were characterized by infrared spectroscopy, X-ray photoelectron spectroscopy, elastic peak electron spectroscopy, and density measurements using helium pycnometry. This work has been stimulated by a considerable interest in pote…
The magnetic anisotropy of the two cyclic hexanuclear Fe(III) clusters [Li⊂Fe 6 L 6 ]Cl·6CHCl 3 and [Na⊂Fe 6 L 6 ]Cl·6CHCl 3, L = N(CH 2 CH 2 O) 3, was investigated. Based on a spin Hamiltonian formalism, the magnetic anisotropy was calculated exactly to first order, i.e., in the strong exchange limit, using Bloch's p…
The effect of water vapor concentration on the reaction rates of NH 3 oxidation and N 2 O decomposition catalyzed by calcined limestone was investigated by use of a fixed bed reactor under atmospheric fluidized bed combustion conditions. Both reactions were inhibited by the presence of water vapor. Inhibition of NH 3…
Aromatic polymers are widely used in products ranging from optical lenses to milk bottles because of their strength, thermal durability, and high glass transition temperatures. All of the commonly used routes employed to generate aromatic polycarbonates and polyesters generate large amounts of waste as by-products and…
Salts of the edge-sharing bitetrahedral anion [M 2 Cl 6 ] 2 - with M = Mn, Fe, and Co were prepared in high yields by reaction of MCl 2 with 1 equiv of chloride ion. The anion [Fe 2 Cl 6 ] 2 - was isolated with five different cations, namely, [PPh 4 ] + ( 1 ), [Et 4 N] + ( 2 ), [ppn] + ( 3 ), [AsPh 4 ] + ( 4 ), and [H…
Effective light-harvesting arrays require multiple photoactive energy donors that funnel energy to an energy acceptor. Porphyrins and phthalocyanines are attractive components for light-harvesting arrays due to their strong absorption in the blue and red regions, respectively, and because energy transfer can occur fro…
The photoinduced anisotropy in polymers and copolymers with a mesogenic and a nonmesogenic azobenzene moiety in the side chain were investigated. The results of the light-induced optical anisotropy study in thin films obtained by means of polarized UV−vis and IR absorption spectroscopy are presented. Starting from in-…
Light-harvesting arrays containing four porphyrins covalently linked to a phthalocyanine in a star-shaped architecture have been synthesized. Cyclotetramerization of an ethyne-linked porphyrin−phthalonitrile in 1-pentanol in the presence of MgCl 2 and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) afforded the all-magnesium…
The stability of oil-in-water emulsions to both creaming and coalescence was measured as a function of salt concentration in heptane + water mixtures stabilized by sodium bis(2-ethylhexylsulfosuccinate) (AOT). Emulsions were prepared from pre-equilibrated phases in Winsor I systems. Up to 0.035 M NaCl, the creaming ra…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTCocondensation of Organosilica Hybrid Shells on Nanoparticle Templates: A Direct Synthetic Route to Functionalized Core−Shell ColloidsSimon R. Hall, Sean A. Davis, and Stephen MannView Author Information School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K. Cite thi…
The phase separation process in a thermoplastic-modified epoxy system was studied using rheological dynamic analysis (RDA) and differential scanning calorimetry (DSC). Transmission electronic microscopy (TEM) was used to get direct representation of morphologies at different times during the phase separation process.…
Proton, low-resolution T 2 NMR relaxation experiments are used to study the adsorption of EPDM to the surface of carbon blacks and the structure of the physical EPDM/carbon black network in cured and uncured compounds. It is shown that a layer of immobilized EPDM is formed at the carbon black surface after mixing. The…
The buildup of the first layers of a polystyrenesulfonate (PSS)/polyallylamine (PAH) multilayer is studied in situ by means of streaming potential measurements (SPM) and by scanning angle reflectometry (SAR). The results are discussed in the framework of a schematic representation of the multilayer in three zones: a p…