Materials Literature
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Zinc II hexacyanoferrate III, Zn 1.5 [Fe(CN) 6 ]·6H 2 O, was prepared by coprecipitation method. The precipitated powder possessed a face-centred cubic structure with a lattice parameter of 10.32 Å. Phase transformation in this cyanide compound was encountered after heat treatment at a temperature at 75 °C or above, f…
Abstract Three series of new thermoplastic, high molecular weight, segmented thiopolyurethanes were synthesized by a one‐step melt polymerization from newly obtained thiodiols, including bis[4‐(2‐hydroxyethyl)thiomethylphenyl]methane, bis[4‐(3‐hydroxypropyl)thiomethylphenyl]methane, and bis[4‐(6‐hydroxyhexyl)thiomethy…
Abstract Rotational molding of polyethylene foams has increasingly become an important process in industry because of its resultant thicker walls, low sound transfer, high stiffness, and good thermal insulation. This report assesses the rotomoldability of two‐layer polyethylene foamed parts. The polymeric material use…
The ab initio structures and energies of a series of gas-phase aluminum chlorides have been calculated at the RHF/6-31G* and MP2/6-31G* levels. The vibrational spectra of AlCl 3, Al 2 Cl 6, AlCl 4 -, EtAlCl 3 -, Al 2 Cl 7 -, Et 2 Al 2 Cl 5 -, and trans -Et 2 Al 2 Cl 4 are calculated at the RHF/6-31G* level. The theore…
Barium titanate (BaTiO 3 ) nanopowders were prepared through a combined polymerization and pyrolysis of a metallo-organic precursor. The mean particle size d m could be adjusted by choosing appropriate reaction temperatures and tempering atmospheres. In the present in situ study of this particular solid-phase reaction…
The effect of electron-electron interactions on the electronic properties of nonchiral single-wall carbon nanotubes is investigated by an extended Hubbard model resolved within the generalized unrestricted Hartree-Fock approximation. On-site U and nearest-neighbor $u$ Coulomb interactions are considered in tubules wit…
We report the observation of a “superquenching” for water-soluble poly- l -lysine derivatives containing an appended cationic cyanine dye on each repeat unit. The formally nonconjugated cyanine dye chromophores strongly associate in a “J” aggregate structure characterized by a sharp red-shifted absorption (compared to…
A novel donor−acceptor conjugated copolymer consisting of the electron-accepting moiety 2,7-diethynylfluorene and the electron-donating moiety tetraphenyldiaminobiphenyl (TPD), i.e., poly{(2,7-diethynyl-9,9-di-2-ethylhexylfluorene)- alt - co -[ N, N ‘-diphenyl- N, N ‘-bis(4-phenyl)-1,1‘-biphenyl-4,4‘-diamine]} (TPD-PF…
Extended data sets for the relative intensity variation of x-ray Bragg reflections of GaAs and ZnSe caused by an external electric field were collected using a modulation demodulation technique. In particular, the functional dependence of the intensity variation on field strength and wavelength of the synchrotron radi…
Abstract Interfacial polycondensation of 2,2′‐bis[2‐(5‐chloroformylfuryl)]propane with various diamines gave high yields of a novel series of furanic polyamides with high inherent viscosities. The properties of these polymers ( T g , surface energy, crystallinity, thermal stability) were assessed and examined in terms…
Crystals of 1,4-bis(2-hydroxy-2-methyl-3-butynyl)-2-fluorobenzene 4 have a rich packing structure with four distinct molecules in the unit cell. A complex hydrogen bonding network results in the formation of cofacial trimers, cofacial dimers, and monomers within the same unit cell. Given a remarkable opportunity to in…
Surface electronic states of the partially hydrogenated diamond $\mathrm{C}(100)\ensuremath{-}(2\ifmmode\times\else\texttimes\fi{}1):\mathrm{H}$ surface were studied by near-edge x-ray absorption fine structure and C $1s$ core level photoemission. Partially hydrogenated surfaces were prepared by synchrotron irradiatio…
Abstract Rheological behaviour and cure characteristics of silica‐filled styrene–butadiene rubber (SBR) compounds and SBR compounds filled with both silica and carbon black with different silica contents were investigated. Rheocurves of the time versus the torque of the compounds showed specific trends with the silica…
Abstract New phosphorus‐containing aromatic diesteramines, 1,4‐bis(4‐aminobenzoyloxy)‐2‐(6‐oxido‐6H‐dibenz〈 c,e 〉〈1,2〉oxaphosphorin‐6‐yl)naphthalene ( p ‐ 3 ) and 1,4‐bis(3‐aminobenzoyloxy)‐2‐(6‐oxido‐6H‐dibenz〈 c,e 〉〈1,2〉oxaphosphorin‐6‐yl)naphthalene ( m ‐ 3 ), were synthesized by the reaction of 2‐(6‐oxido‐6H‐diben…
Highly crystalline and porous vanadium-incorporated MCM-48 materials were prepared using gemini surfactants as structure-directing agents and vanadyl sulfate pentahydrate as the source of the heteroelements. Materials with Si/V ratios varying from 20 to 100 were synthesized without loss of the typical cubic MCM-48 str…
Interfacial energetics, local ionic coordinations, and electronic states at basal twin interfaces in $\ensuremath{\alpha}\ensuremath{-}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}$ (corundum) were investigated by means of first-principles density-functional and empirical shell-model calculations. Three different metastable twin…
Abstract Hydroxypropylcellulose (HPC) has been used as a steric stabilizer for preparing polyaniline dispersions using the route of oxidative dispersion polymerization of aniline. Using strongly acidic conditions (1 mol l −1 HCl), low temperature of about 2 °C and a concentration of aniline as low as 0.5%, ammonium pe…
Abstract White rice husk ash (WRHA)–polypropylene (PP)/natural rubber (NR) composites were prepared using a Brabender Plasticorder at 180 °C and a rotor speed of 50 rev min −1 . The mechanical and water‐absorption properties were studied. The incorporation of WRHA into the PP/NR matrix has resulted in the improvement…
A wide class of magnetic molecular materials - molecular clusters with high magnetic moment containing 3d transition metals (such as `Fe 8 ', `Mn 12 ac', etc) - have been considered from the point of view of their use as refrigerants in low-temperature regions. The consideration was made in the framework of the model…
Electrical treeing is of interest to the electrical generation, transmission and distribution industries as it is one of the causes of insulation failure in electrical machines, switchgear and transformer bushings. Previous experimental investigations of electrical treeing in epoxy resins have found evidence that the…