Materials Literature
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Derivatives of quinolinium iodide have been found to exhibit second-order nonlinear optical (NLO) response in their crystalline form. The quaternary amine functionality is introduced as an electron-withdrawing group in NLO-active chromophores. While their electron-accepting capabilities are somewhat weaker than those…
Potassium titanate (K2Ti6O13) whisker treated with tetrabutyl orthotitanate was used to improve the mechanical and thermal properties of the poly(acrylonitrile–butadiene–styrene) (ABS) copolymer. The composites were prepared in a twin-screw extruder followed by injection molding. Static tensile measurements showed tha…
The polymerization of N-vinylcarbazole in the presence of FeCl3-impregnated montmorillonite resulted in the formation of a poly(N-vinylcarbazole)–montmorillonite composite. XRD analysis of the composite revealed no expansion for d001 spacing, in sharp contrast to that for the same composite prepared in the absence of…
A new kind of ultraviolet (UV)-curable waterborne polyurethane–acrylate (PUA) ionomer, prepared from toluene diisocyanate (TDI), polyethylene glycol (PEG), dimethylolpropionic acid (DMPA), triethylamine (TEA), and 2-hydroxyethyl methacrylate (HEMA), was synthesized by the modified prepolymer mixing process in which wa…
The effects of pH value of reaction system, reaction time, and reaction temperature on the chlorination reaction in the preparation of chlorinated natural rubber (CNR) from natural rubber latex were discussed. It has been found from the thermal analysis that the thermal degradation of CNR in nitrogen is a one-step rea…
The regenerated Antheraea pernyi silk fibroin films were prepared from calcium nitrate solution and crystallized with aqueous methanol solution. The structural and conformational changes were investigated by the X-ray diffraction method and infrared spectroscopy upon methanol treatment. The concentration and treatment…
Sulfur cured natural rubber vulcanizates were reclaimed by a vegetable product and diallyl disulfide under various reclaiming conditions. Progress of reclaiming was monitored by estimating the sol and gel portions, molecular weight determination of sol portions, and Mooney viscosity of reclaimed rubber. Tensile proper…
The thermostability and thermal decomposition kinetics of methyl cellulose (MC), ethyl cellulose (EC), carboxymethyl cellulose (CMC), hydroxyethyl cellulose (HEC), and hydroxypropyl–methyl cellulose (HPMC) were characterized in nitrogen and air by thermogravimetry (TG). Various methods of kinetic analysis were compare…
The use of heteroatom-substituted porphyrins in bioorganic and materials chemistry requires the ability to position a variety of substituents in a controlled manner about the porphyrin periphery. We describe a rational route to trans -AB 2 C-type porphyrins bearing one oxygen atom (N 3 O) or one sulfur atom (N 3 S) in…
A polylactide (PLA type LA 0200 K) was spun in high-speed melt spinning and spin drawing processes. The fibers were characterized with regard to the degree of crystallinity, the orientation, and the textile physical properties. The polymer was produced by a reactive extrusion polymerization process, and its hydrolytic…
Polypyrrole (PPy) grown from organic media and polymeric material produced by coelectropolymerization of pyrrole and aniline in organic acidic media were investigated by cyclic voltammetry, electrochemical impedance spectroscopy (EIS), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR), scanning ele…
The title compound, [Fe(btr)(3)](ClO(4))(2), has been synthesized. The investigation of its magnetic properties has revealed a low-spin <--> high-spin conversion occurring in two steps, each step involving 50% of the Fe(2+) ions. The low-temperature step is very abrupt and occurs with a thermal hysteresis whose width…
Organosoluble polyimide/silica hybrid materials were prepared using the sol–gel process. The organosoluble polyimide was based on pyromellitic anhydride (PMDA) and 4,4′-diamino-3,3′-dimethyldiphenylmethane (MMDA). The silica particle size in the hybrid is increased from 100–200 nm for the hybrid containing 5 wt % sili…
We present an calculation of the electronic and optical excitations of an isolated polythiophene chain as well as of bulk polythiophene. We use the GW approximation for the electronic self-energy and include excitonic effects by solving the electron-hole Bethe-Salpeter equation. The inclusion of interchain screening i…
Cluster research so far only dealt with either 3D free clusters or clusters on substrates with strong electronic coupling at the interface. Preparation of free and orientated 2D clusters is usually not possible because one of these conditions generally excludes the other. We demonstrate a new way to grow 2D clusters o…
The generalized boundary conditions for the envelope wave function that take into account the real structure of an interface were used to investigate the hole spectrum of the semiconductor quantum dot embedded in an insulator matrix. An essential influence of the interface levels, which could exist at the top of the v…
[formula: see text] N-Confused meso-substituted porphyrin is a porphyrin isomer previously available from one-flask porphyrin syntheses as a low-yield byproduct (< 7.5%). We have found that methanesulfonic acid catalyzed condensation of pyrrole and benzaldehyde followed by DDQ oxidation provides N-confused tetraphenyl…
A simple and general procedure has been developed for the syntheses of ordered large-pore (up to 14 nm) mesoporous metal oxides, including TiO 2, ZrO 2, Nb 2 O 5, Ta 2 O 5, Al 2 O 3, SiO 2, SnO 2, WO 3, HfO 2, and mixed oxides SiAlO y, Al 2 TiO y, ZrTiO y, SiTiO y, ZrW 2 O y . Amphiphilic poly(alkylene oxide) block co…
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Single phase Ba(Mg 1/3 Ta 2/3 )O 3 films were prepared on Si (100) substrates and a fused silica substrate by pulsed laser deposition. The structure and annealing properties of these films were studied by the x-ray -2 scan. The wavelength dependence of the transmittance of the films deposited on fused silica was deter…