Materials Literature
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Eight adducts of Rh2(O2CCH3)4 with axial pyridine derivatives that contain hydrogen-bonding amino and/or steric methyl substituents in the 2- and 6-positions have been prepared and examined by electronic absorption and 1H NMR spectroscopy in solution and by elemental, IR, thermogravimetric, and X-ray diffraction analy…
A model for unsteady-state solid-state polycondensation (SSP) is developed and is applied to the polymerization of poly(bisphenol A carbonate) and poly(ethylene terephthalate) (PET). The model assumes that diffusion of the reaction condensate in the solid polymer is the rate-limiting step in the overall polymerization…
Fly ashes resulting from municipal solid waste incineration contain lead and cadmium chlorides (PbCl 2, CdCl 2 ) that volatilize during the thermal treatment and vitrification. They are recovered in “secondary ashes”. We report the thermal conversion of lead and cadmium chlorides into phosphate glasses, using ammonium…
In situ FTIR spectroscopic and electrochemical data and ex situ (emersion) electron diffraction (LEED and RHEED) and Auger spectroscopic data are presented on the structure and reactivity, with respect to the electro-oxidation of CO, of the Ru(0001) single-crystal surface in perchloric acid solution. In both the absen…
An experimental study combined with theory based on distribution kinetics shows how polystyrene degradation is enhanced by continuous addition of peroxide. We investigated polystyrene oxidative degradation kinetics by di- tert -butyl peroxide in the solvent trichlorobenzene at temperatures from 100 to 150 °C. The basi…
The synthesis, spectroscopic characterization, and electrochemistry of As, Sb, and Bi corroles are reported. The investigated complexes are represented by [(OEC)AsV(CH3)]+ClO4- and (OEC)M where M = As(III), Sb(III), or Bi(III) and OEC is the trianion of octaethylcorrole. The products of each redox reaction are charact…
The saturating reaction of ammonia was studied on trimethylaluminum (TMA)-modified porous silica. This reaction step completes a reaction cycle of TMA and ammonia in aluminum nitride growth by atomic layer chemical vapor deposition (ALCVD), a technique based on well-separated saturating gas−solid reactions. The reacti…
The well-known tetradentate ligand 1,2-bis(pyridine-2-carboxamido)benzenate(2-), (bpb)2-, and its 4,5-dichloro analogue, (bpc)2-, are shown to be "noninnocent" ligands in the sense that in coordination compounds they can exist in their radical one- and diamagnetic two-electron-oxidized forms (bpbox1)- and (bpbox2)0 (a…
Ternary composites of polypropylene (PP), elastomer, and calcium carbonate (CaCO3) filler were prepared to study their structure/property relationships. Two kinds of phase structure were formed, depending on the elastomer present in the composites. Separation of elastomer and filler particles was found when a nonpolar…
It is commonly believed that nonplanar distortions of the porphyrin skeleton bring about significant red shifts in the electronic absorption spectra. However, based on absorption spectroscopy and semiempirical AM1 studies of meso -tetrakis(perfluoroalkyl)porphyrins, DiMagno and co-workers have challenged this notion.…
The influence of structural parameters on the exchange coupling J between metal atoms in end-to-end azido-bridged binuclear complexes of Cu(II) and Ni(II) has been studied by means of density functional calculations. For the case of double-bridged Cu(II) compounds, four ideal pentacoordinate models have been employed…
The rheological and morphological behaviors of commercially available three binary blends of ethylene 1-octene copolymer (EOC) regarding the melt index (MI), density and comonomer contents, one component made by the Ziegler–Natta and the other by the metallocene catalysts, were investigated to elucidate miscibility an…
The synthesis of vanadium oxide nanotubes (VO x -NTs) containing primary monoamines with long alkyl chains has been achieved by two new approaches, using either VOCl 3 or V 2 O 5 as vanadium oxide precursor. The hydrolysis of amine complexes of VOCl 3 involves a ligand-assisted templating mechanism as well as the inte…
A series of liquid crystalline copolyethers have been synthesized from 1-(4-hydroxy-4‘-biphenyl)-2-(4-hydroxyphenyl)propane with 1,7-dibromoheptane and 1,11-dibromoundecane (coTPPs-7/11). This represents the copolyethers containing only odd numbers of methylene units in both comonomers. The molar ratio between these t…
The thermal expansion behaviour of polymer composites having a matrix of polystyrene containing aluminium nitride (AlN) reinforcement has been investigated under a special dispersion state of filler in the composite: AlN filler particles surrounding polystyrene matrix particles. It is found that the coefficient of the…
A series of fully methylthiolated bi-, ter-, and quatertetrathiafulvalenes have been synthesized using cross- and homocoupling reactions of tetrathiafulvalenylzinc derivatives; the tetracation-tetraradical derived from the helical tetrathiafulvalene tetramer exhibits an intramolecular association of the terminal catio…
The morphology of thin films of asymmetric block copolymers of poly(isoprene- block -ferrocenyldimethylsilane) was studied using atomic force microscopy, transmission electron microscopy, and optical microscopy. Block copolymers with the organometallic (ferrocenylsilane) phase between 20 and 28 vol % were investigated…
Electric field-induced transient pore formation (reversible electroporation) in the bilayer membrane of synthetic large unilamellar vesicles (LUV) is used as a novel method for the preparation of angstrom size quantum dots of the indirect band gap semiconductor AgBr. With Ag + ions encapsulated in 178 nm diameter LUVs…
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionORIGINAL ARTICLEThis notice is a correctionConducting Polymer Nanocomposites: A Brief OverviewRupali Gangopadhyay and Amitabha DeCite this: Chem. Mater. 2000, 12, 7, 2064Publication Date (Web):June 23, 2000Publication History Published online23 June 2000Published ini…
Azobenzene chromophores are promising as molecularly engineered materials for reversible optical data storage based on molecular reorientation. In this paper, the optical properties of several different azobenzene chromophores are studied using molecular quantum calculations. Special emphasis is put on molecular aniso…