Materials Literature
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Abstract A simple kinetic model capable of describing the behaviors of solid‐state polymerization (SSP) of poly(ethylene terephthalate) (PET) has been developed. According to this model, there are two types of end groups, namely active end groups and inactive end groups, and the solid‐state polycondensation reaction i…
A pi-conjugated, but non-Kekulé- and nondisjoint-type poly(1,2-phenylenevinylene) network bearing 4-substituted di-tert-butylphenoxyls was synthesized through a one-pot polycondensation of the star-shaped subpart and the subsequent oxidation, which was persistent even at room temperature. The polyphenoxyl radical with…
We examine the various instabilities of quarter-filled strongly correlated electronic chains in the presence of a coupling to the underlying lattice. To mimic the physics of the tetramethyltetrathiafulvene $(\mathrm{TMTTF}{)}_{2}X$ Bechgaard-Fabre salts we also include electrostatic effects of intercalated anions. We…
A nanostructured, polymer-supported Sc(III) catalyst for heterogeneous Lewis acid catalysis in water was prepared by quantitative Sc(III) exchange of a cross-linked inverted hexagonal assembly containing sodium sulfonate groups. The material was found to catalyze Mukaiyama aldol and Mannich reactions with a syn/anti p…
The coarsening of droplets in an emulsion with a size distribution that initially is given by the Lifshitz−Slyozov−Wagner (LSW) distribution is studied by means of numerical calculations taking into account elastic interfacial behavior. Droplets smaller than the critical radius will shrink while droplets larger than t…
Abstract Silicone–acrylic resins were synthesized to prepare superweatherable paints for building materials. The raw materials used were n ‐butyl acrylate, methyl methacrylate, and n ‐butyl methacrylate as acrylic monomers and 3‐methacryloxypropyltrimethoxysilane (MPTS) as a silicone monomer reactive with the acrylic…
Layered nanocomposites with poly(ethylene oxide), PEO, and poly(vinylpyrrolidone), PVP, incorporated between H x Ti 2 - x /4 □ x /4 O 4 (□ = Ti vacancy) titanate layers, are synthesized from a colloidal titanate suspension obtained by exfoliation in aqueous tetrabutylammonium hydroxide and subsequent acidification. Pr…
The compound [Cu2(bpm)2(N3)4]n (bpm = bis(pyrazol-1−yl)methane) shows three unique coordination modes (μ1,1-, μ1,1,1-, μ1,1,3-N3) and ferromagnetic interaction between the copper(II) ions. The structure of the compound exhibits a one-dimensional railroad polymer made up of repeating defective dicubane-type units linke…
Abstract The morphology and properties of polypropylene (PP)/clay nanocomposites are described. The melt intercalation of organophilic clay was carried out with a single‐screw extruder. The effects of two kinds of treatments of clay are discussed. Maleic anhydride (MAH)‐grafted PP was used as a compatibilizer. The exp…
We have computed the local electric field in a body-centered tetragonal (BCT) lattice of point dipoles via the Ewald-Kornfeld formulation, in an attempt to examine the effects of a structure transformation on the local field strength. For the ground state of an electrorheological solid of hard spheres, we identified a…
Abstract Measurements of water vapor transmission rate ( WVTR ) are often based on the wet cup method described by ASTM E 96‐95. In attempting to compare the performance of thin polymer films with moderate to high water vapor permeability, it was observed experimentally that the ASTM method did not give reliable resul…
ADVERTISEMENT RETURN TO ISSUEPREVArticleResonant DiffractionJean-Louis Hodeau, Vincent Favre-Nicolin, Sandra Bos, Hubert Renevier, Emilio Lorenzo, and Jean-Francois BerarView Author Information Laboratoire de Cristallographie-CNRS, Associe a l'Université Joseph Fourier, 25 Avenue des Martyrs, BP 166, F-38042 Grenoble…
Small amplitude, long waves travelling over the surface of a current-carrying metal thin film are studied. The equation of motion for the metal surface is determined in the limit of high applied currents, when surface electromigration is the predominant cause of adatom motion. If the surface height h is independent of…
We report the growth of high-quality c-axis-oriented epitaxial MgB2 thin films by using a pulsed laser deposition technique. The thin films grown on (1`1 0 2) Al2O3 substrates show a Tc of 39 K. The critical current density in zero field is ~ 6 x 10^6 A/cm2 at 5 K and ~ 3 x 10^5 A/cm^2 at 35 K, suggesting that this co…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTFirst Oxadiazole-Functionalized Terbium(III) β-Diketonate for Organic ElectroluminescenceJiafu Wang, Ruiyao Wang, Jun Yang, Zhiping Zheng, Michael D. Carducci, Troy Cayou, Nasser Peyghambarian, and Ghassan E. JabbourView Author Information Department of Chemistry and O…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A recently developed long-wavelength continuum phenomenological model is employed to study phonon tunneling for an arbitrary incidence angle, and to estimate the contribution of optical phonons to the perpendicular thermal conductivity in simple and multisuperlattice nonpolar semiconductor heterostructures. Phonon tun…
Abstract Motion of chains of poly(ethylene oxide) within the interlayer spacing of 2:1 phyllosilicate/montmorillonite was studied with 1 H and 13 C NMR spectroscopy. Measurements of the 1 H NMR line widths and relaxation times across a large temperature range were used to determine the effect of bulk thermal transitio…
Abstract A series of amorphous copolymers containing disperse red 1 and crosslinkable acrylic groups were prepared. The crosslinked polymers were prepared in thin films by thermal polymerization of the acrylic groups in the copolymers. The orientation induced by irradiation with a linearly polarized laser was measured…
The thermal dependence of the structure of natural phengite-2M 1 with chemical formula (K 0.95 Na 0.05 )(Al 0.76 Fe 0.14 Mg 0.10 2 (Si 3.25 Al 0.75 )O 10 (OH 1.96 F 0.04 ) has been studied by in situ neutron diffraction. The short-range correlated behaviour of the hydroxyl group was probed by FTIR spectroscopy while t…