Materials Literature
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Unsaturated groups were introduced into the main chains of poly(butylene succinate) (PBS) by the condensation polymerization of 1,4-butanediol with succinic acid and maleic acid (MA). The resulting aliphatic polyesters were subjected to chain extension via the unsaturated groups with benzoyl peroxide (BPO), BPO/ethyle…
Upon cation complexation, donor–acceptor–donor–substituted intrinsic fluoroionophore 3 shows red-shifted emission spectra accompanied by an extraordinarily high fluorescence enhancement.
Colossal magnetoresistance manganites have been synthesised by the microwave dielectric heating of metal nitrates, which act both as effective microwave susceptors, and a ready source of oxidizing NO2 to induce mixed valency.
We report the results of extensive molecular dynamics simulations of solid-to-solid transitions in two- to six-layer colloidal suspensions confined between two smooth parallel walls. The studies are designed to elucidate the ordered particle packings that interpolate between the structures of two- and three-dimensiona…
Ultrasound radiation is employed to prepare a composite material made of polystyrene and amorphous iron nanoparticles. The thermal stability and magnetic properties are reported. © 2000 Society of Chemical Industry
Various Ti‐V‐Ni hydrogen storage alloys branched from , one of Ni‐substituted alloys, were prepared by an arc‐melting method. All alloys prepared in this work were composed of both black and white phases to a greater or lesser extent. It was found by X‐ray diffractometry and electron probe microanalysis that the black…
Synthesis and characterization of new nanocomposites of and a sulfonated, alkylated polyaniline derivative [poly( N ‐propane sulfonic acid aniline), PSPAN] are described. Two types of nanocomposites have been produced, one by reaction of vanadium triisopropoxide solutions with N ‐propane sulfonic acid aniline and one…
The ignition and pyrolysis of some copolymers of methyl methacrylate (MMA) with diethyl(methacryloyloxymethyl)phosphonate (DEMMP) have been studied by a simple tube furnace and by isothermal and non-isothermal TGA. The results indicate that copolymers containing DEMMP thermally degrade, under both air and nitrogen, by…
Fluorinated and chlorofluorinated polyimides with high thermal stability and low optical absorption loss in the optical communication wavelengths of 1.3 and 1.55 μm were investigated for low-loss passive waveguide applications. These polyimides were prepared from pyromellitic dianhydride (PMDA) with 1,4-bis-[4-amino-2…
Rhodococcus sp. NCIMB112038 can utilize naphthalene as its sole carbon and energy source. The gene encoding cis-naphthalene dihydrodiol dehydrogenase (narB) of this strain has been cloned and sequenced. Expression of NCIMB12038 cis-naphthalene dihydrodiol dehydrogenase was demonstrated in Escherichia coli cells. narB…
Amphiphilic poly(ether ester amide) (PEEA) multiblock copolymers were synthesized by polycondensation in the melt from hydrophilic poly(ethylene glycol) (PEG), 1,4-dihydroxybutane and short bisester-bisamide blocks. These amide blocks were prepared by reaction of 1,4-diaminobutane with dimethyl adipate in the melt. A…
Sixteen glycosides of pregnanes, including ikemagenin, lineolon, and a new pregnane, 3beta8beta,14beta,15beta,16alpha-pentahydroxy-++ +5alpha-pregnan-20-one, termed pleurogenin, were isolated from the roots of Asclepias tuberosa. Among ikemagenin and lineolon glycosides, one (1) was a known glycoside, and eight (2-7,…
We have observed a drastic change in the properties of indium oxide (In2O3) thin films prepared by pulsed laser deposition in a pure helium (He) background gas on unheated glass substrates. At high He pressures above 1.0 Torr, transparent crystalline In2O3 films could be prepared, even though the deposition was carrie…
This review deals with the current status of newly developed pendant-type PEG-immunoliposomes (Type C), carrying monoclonal antibodies or their fragments (Fab') at the distal ends of the PEG chains. In terms of target binding of Type C, two different anatomical compartments are considered. They are mouse lung endothel…
In this study, two different viscosity-average molecular weight (eta = 4.0 and 7.8) poly(L-lactide) (PLLA) were synthesized by ring-opening polymerization and the poly(L-lactide)/hydroxyapatite composites (PLLA/HA) were prepared by blending HA particles (size range: 25-45 microm and Ca/P = 1.69) with a content of 10,…
Silicon imido nitride with a specific surface area up to 1000 m2 g−1 is obtained by ammonolysis of silicon tetrachloride in organic solvents and subsequent NH4Cl removal at elevated temperatures in a stream of anhydrous ammonia. The material has a remarkably narrow pore size distribution and a mean pore size of 5.7 nm…
Perrhenic acid in combination with tertiary arsines gives a versatile catalytic system for epoxidation of alkenes with hydrogen peroxide. The best results are obtained with diphenylmethylarsine. A wide range of alkenes could be epoxidised with aqueous hydrogen peroxide (60%) in 60–100% yields with substrate to catalys…
A previously described automated thin-film deposition system based on rf-magnetron sputtering could deposit quite complex optical multilayer systems with good precision and with no one in attendance [Sullivan and Dobrowolski, Appl. Opt. 32, 2351-2360 (1993)]. However, the deposition rate was slow, and the uniform area…
An Fe ion-exchanged BEA zeolite (Fe-BEA), which effectively performs selective catalytic reduction of N2O with methane in the presence of excess oxygen, is much more active than Fe-MFI zeolite reported in the literature.
Incorporation of germanium into a zeolite framework allows the synthesis of Ti-Ge-ITQ-7 without seeding in <12 h, instead of 12 days when seeding or >40 days without seeding for the Ge-free ITQ-7; the synthesis reported also increases the efficiency of Ti incorporation and allows the preparation of almost nanocrystali…