Materials Literature
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Abstract Processing, cure characteristics, and mechanical properties of EPDM rubber containing ground EPDM vulcanizate of known composition were studied. Mooney viscosity increases and Mooney scorch time decreases by the addition of the ground vulcanizate. At higher loadings of the ground rubber, the maximum rheometri…
The synthesis and structural characterization of several new cyano-bridged copper(II) and nickel(II) homodinuclear complexes is presented. The measure of magnetic properties for these complexes is complemented with a computational study of the exchange coupling for several model structures representing this family of…
Abstract CoFe 2 O 4 magnetic nanoparticles were prepared by in situ precipitation and oxidation of Co 2+ and Fe 2+ within a sulfonated polystyrene resin. The nanometric particles were characterized by X‐ray diffraction. A ferrofluid was prepared from the CoFe 2 O 4 mineralized polymer resin and water. Poly(vinyl alcoh…
[reaction: see text]. The chlorosulfonation of tris(pentafluorophenyl)corrole proceeds with an extremely high selectivity as to afford one out of 139 possible isomers in very high yield. The bis-chlorosulfonated corrole is an excellent precursor to the planar-chirality (triphenylphosphine)cobalt(III) complex (fully ch…
Copper–cobalt–aluminium hydrotalcites with (Cu + Co)/Al atomic ratio of 3.0 and Cu/Co atomic ratios 80:20, 75:25, 50:50, 33:67, 25:75 and 20:80 were synthesized by coprecipitation under low supersaturation and characterized by various physicochemical techniques. Powder X-ray diffraction (PXRD) showed a single phase wi…
Simulations were performed on solutions of associating polymers, where the pairing energy between ``stickers'' is comparable to thermal energy, to gain insights into the nature of reversible gelation. At high temperatures, interchain associations relax over microscopic time scales, so that geometrical percolation is u…
Copper(II) bisimidazolate affords five different polymorphs; of these, one was structurally characterized 40 years ago by standard single-crystal X-ray diffraction (Jarvis, J. A. J.; Wells, A. F. Acta Crystallogr. 1960, 13, 1027), while the remaining four, selectively prepared as pure polycrystalline phases, have been…
In this report, we describe in detail the O(2)-binding chemistry of the metalloporphyrin (F(8)TPP)Fe(II) (1). This complex was synthesized from aqueous dithionite reduction of (F(8)TPP)Fe(III)-Cl (X-ray structure reported: C(55)H(36)ClF(8)FeN(4)O; a = 13.6517(2) A, b = 13.6475(2) A, c = 26.3896(4), alpha = 90 degrees,…
Abstract The present study concerns the investigation of a material expected to be biocompatible and able to promote bone regeneration. For this purpose, cellulose was chemically modified by phosphorylation. Once implanted, phosphorylated cellulose could promote the formation of calcium phosphates, thus having closer…
We consider the possible charge and orbital ordering in a Hollandite compound Bi_xV_8O_{16}, which is a new one-dimensional triangular-lattice t_{2g}-orbital system. Using the strong-coupling perturbation theory, we derive the effective spin-orbit Hamiltonian in the approximation neglecting the small off-diagonal hopp…
Abstract In this work, we studied the mechanism of the fire retardancy of ammonium polyphosphate (APP) in polyurethane (PU). Indeed, according to the limiting oxygen index test, the efficiency of APP in PU coating was proven. On the one hand, thermogravimetric analyses showed that the addition of APP to PU accelerates…
WinPLOTR is a graphic program for the analysis of powder diffraction patterns. It has been developed for a Windows 9x/2k/NT environment. It takes advantage of this graphical environment to offer a powerful and user-friendly powder diffraction tool. The program is able to display and analyse many different kinds of dif…
Au-nanocluster-doped inorganic−organic hybrid coatings on polycarbonate substrates were prepared for the application of abrasion-resistant colored coatings as well as nonlinear optical material. The Au-doped sol was prepared by incorporating HAuCl 4 ·4H 2 O into a composite sol derived from 3-(glycidoxypropyl)trimetho…
The results of studies of static dielectric permittivity epsilon(T) in the isotropic phase of 4-cyano-4-pentylalkylbiphenyl and n-p-methoxybenzylidene-p'-butylaniline (5CB-MBBA) mixtures are presented. 5CB and MBBA are nematogens with antagonistic permanent dipole moments configurations. An increase in MBBA concentrat…
A minimal model is presented for helix−coil type transitions in solutions of self-assembled supramolecular polymers. The diagram of states calculated using this model shows that there are essentially two ordering regimes, one where the polymerization transition and the helical transition coincide and one where they ar…
A series of Mo−SBA-1 ( Pm 3̄ n ) cubic mesoporous molecular sieves with various H 2 O/HCl and Si/Mo molar ratios have been synthesized at 0 °C using cetyltriethylammonium bromide, tetraethyl orthosilicate, ammonium heptamolybdate and hydrochloric acid. It was found that the Mo−SBA-1 particles synthesized at 0 °C for 4…
The surface segregation behavior of poly(dimethylsiloxane)/polyethylene (PDMS/PE) and poly(dimethylsiloxane)/polypropylene (PDMS/PP) blends has been studied using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). It is shown that the overall concentration of silicon-containing species at the su…
The in situ polymerization of organic monomers to consolidate ceramic suspensions in the form of gelled bodies with very complex shapes has recently been employed for the manufacture of both dense and porous ceramics. The control of the polymerization rate is very important, particularly for the porous ceramics where…
We analyze the recent experimental data on photofissility for ${}^{237}\mathrm{Np}$, ${}^{238}\mathrm{U}$, and ${}^{232}\mathrm{Th}$ at incident photon energies above $200\mathrm{MeV}$. For this analysis, we developed a Monte Carlo algorithm for the nuclear evaporation process in photonuclear reactions. This code is u…
The influence of a partial boron substitution on the crystal structure, Curie temperature, easy magnetization direction and magnetostriction of Tb 0.7 Pr 0.3 Fe 2 has been studied. The matrix of Tb 0.7 Pr 0.3 Fe 2 consists of the (Tb, Pr)Fe 2 phase with a cubic MgCu 2 -type structure coexisting with a large amount of…