Materials Literature
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The structures of side chain liquid crystalline poly(silylenemethylene)s (−(SiCH 3 R−CH 2 )−: R = O(CH 2 ) N O−Ph−Ph, Ph = phenyl) (PSM- N; N = 3, 6, 8, 11) have been studied by X-ray diffraction, differential scanning calorimetry (DSC), polarized optical microscopy, and transmission electron microscopy (TEM). DSC stu…
ABSTRACT The strength of films extruded from powder blends of corn zein or corn gluten meal (CGM) with low‐density polyethylene was investigated. Tensile strength, percent elongation at break, and elastic modulus of the extruded films were measured. The tensile strength decreased from 13 MPa to ≈10.5 MPa with zein add…
A facile synthesis of new conjugated ferrocenyl-based dendrimers is reported and the compounds obtained have been fully characterized. The synthetic method consists of a two-step procedure, which combines olefination by the Wittig procedure and Pd-mediated C–C coupling, leading to high yields of first generation dendr…
Abstract The crystallization behavior of oligoester blends prepared from crystalline poly(hexanediol adipate) (PHA) and amorphous poly(ethylene diethylene glycol adipate) (PEDEA) was studied using POM, WAXD, and DSC. The crystal form of both PHA and the blends are spherulites. The crystallinity, melting enthalpies, an…
The copper(II) ion in [Cu(C5H5N3O)2(CF3SO3)2]·H2O lies on a center of symmetry and is coordinated by two pyrazinecarboxamide ligands in a square-planar geometry with Cu—O and Cu—N distances of 1.9445 (14) and 1.9680 (17) Å, respectively. The Cu(C5H5N3O)2 unit is approximately planar, with an average atomic deviation…
Manganese (III) meso-tetrakis(p-sulfonatophenyl)-β-octabromoporphyrin supported on Amberlite IRA-400 [Mn(Br8TPPS)-Ad-400] is a robust and efficient catalyst for epoxidation of alkenes and hydroxylation of alkanes with sodium periodate at room temperature.
The redox reaction of silver acetate with [Ni6(CO)12]2− (2) in acetonitrile has afforded in low yields (≤10%) a close-packed silver–nickel carbonyl cluster: namely, the pseudo-Td [Ag16Ni24(CO)40]4− tetraanion (1) as the [PPh3Me]+ salt. This well-defined, dark brown bimetallic cluster, which is air-unstable and light-s…
Abstract To develop high‐quality electromagnetic interference (EMI) shielding materials, the effect of plasma pretreatment with various gases prior to Cu plating was investigated. Plasma treatment increased the surface roughness in the decreasing order of Ar > O 2 > NH 3 , but adhesion of the Cu layer on poly(et…
This paper presents a 35 Cl NMR and XRD study of the structure and dynamical behavior of ClO 4 - intercalated into the interlayers of Mg,Al and Li,Al layered double hydroxides (LDHs). The variable temperature and variable relative humidity (R.H.) 35 Cl NMR data show that for these phases ClO 4 - is rigidly held at low…
Absorption and fluorescence spectroscopies were used to study the adsorption of Rhodamine 3B (R3B) dye on Saponite (Sap) particles in aqueous suspensions. Fluorescence data confirmed that the R3B monomer can be adsorbed in the interlayer space and at the water/clay interface of the Sap tactoids. From the evolution of…
A palladium-substituted polyoxometalate having a Keggin structure, supported on γ-alumina or active carbon, was used as a catalyst precursor for catalytic hydrogenation. The catalyst system enabled fast hydrogenation of arenes at 30 bar H2 and 230 °C. Most interesting was the finding that arenes could be selectively r…
The possibility to improve the thermoelectric properties of the misfit layer cobaltite [Tl 1 - x Sr 2+ x - y Co y O 3 ][CoO 2 ] b 1 / b 2, either by increasing the Tl content or by substituting Bi or Tl, has been investigated. Using a direct synthesis method, it is shown that the Tl content in this oxide, written for…
We focus on chain organization of long and short block chains on lamellar microdomains developed in a series of binary mixtures denoted as as / s i, which are composed of a long asymmetric polystyrene- block -polyisoprene (SI) and one of three short symmetric SI's denoted respectively as as and s i ( i = 1, 2, 3). We…
For the first time a pH indicator that responds to two different external stimuli, i.e. pH and light, namely methyl orange, has been implemented in a dendrimer. Six generations (G0−G5) of methyl orange-functionalized poly(propyleneamine) dendrimers (“MO dendrimers”) have been synthesized and characterized using 1 H NM…
A new copper−antimony sulfide, [C 4 H 12 N 2 ] 0.5 [CuSb 6 S 10 ], has been hydrothermally synthesized from binary metal sulfides in the presence of triethylenetetramine and characterized by single-crystal X-ray diffraction, thermogravimetry, elemental analysis, and SQUID magnetometry. The product ( M r = 1158.72) cry…
Nano-scale textures of transparent and ultra water-repellent thin films are prepared by microwave plasma CVD (Figure) using trimethylmethoxysilane. Water-repellency of films deposited on glass, silicon and polymethylmethacrylate substrates are discussed in terms of their nanotextures, the control of which is crucial t…
Synthesis and properties of new pH-sensitive cholesteric polymer composites are described. Polymer composites, consisting of low molar mass liquid crystal and chiral molecules entrapped in the polymer network, responded to changes in the chemical environment by increasing the pitch of the cholesteric helix. Hydrogen b…
The ion exchange occurring between a poly(vinylferrocene) (PVF) film and the bathing solution during the oxidation−reduction process was studied by probe beam deflection (PBD) in aqueous and nonaqueous media. In nonaqueous media the results for different electrolyte salts indicate that anions are exchanged. In aqueous…
Abstract Low‐density polyethylene was modified to incorporate aniline moieties by reactive processing with 4‐aminobenzenesulfonyl azide. Under melt‐processing conditions, the loss of nitrogen produces a sulfonyl nitrene which, in the singlet state, interacts with the substrate primarily by C–H insertion. Polymeric ble…
Two novel silicate anions, a singly-substituted cubic octamer (double four-ring cage with a pendant orthosilicate group) and its dimeric counterpart (two octameric cages linked by a single siloxane bridge), are detected by 29Si NMR spectroscopy in concentrated tetraalkylammonium silicate solutions at the low alkalinit…