Materials Literature
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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…
Abstract A cubic mesoporous silicate (CMS) was prepared, characterised, and assessed as an adsorbent for tetramethyl ammonium hydroxide (TMAH) from aqueous solution. The adsorption process was studied as a function of temperature and time. Sorption closely followed the Langmuir model. The adsorption of TMAH on CMS was…
Micrometer-sized carbon tubes can be conveniently prepared via a new chemical approach by pyrolyzing the composite fibers consisting of a polypyrrole skin layer and a PET core fiber at 1000 °C under a N 2 atmosphere. The resultant carbon tubes were found to be amorphous carbon. After further annealing at 1000−2400 °C,…
When incorporated into proteins, fluorinated amino acids have been utilized as 19F NMR probes of protein structure and protein-ligand interactions, and as subtle structural replacements for their parent amino acids which is not possible using the standard 20-amino acid repertoire. Recent investigations have shown the…
Surface-alkoxylated silica can be prepared by reacting precipitated silica with high-boiling and polymeric alcohols. The structure of the products was investigated through 13 C and 29 Si MAS NMR experiments. The influence of the alkoxy group structure and density on the hydrolytic stability of the alkoxylated silicas…
Chlorin building blocks incorporating a geminal dimethyl group in the reduced ring and synthetic handles in specific patterns at the perimeter of the macrocycle are expected to have utility in biomimetic and materials chemistry. A prior route employed condensation of a dihydrodipyrrin (Western half) and a bromodipyrro…
A family of diaminobutane core, poly(propylene imine) dendrimers coordinated to Cu(II), DAB-Am(n)-Cu(II)x (n = 4, 8, 16, 32, 64, x = n/2), was studied by means of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES) spectroscopies. The geometry of the dipropylene triamine (…
An XAS investigation was undertaken to understand the mechanism of our platinum deposition process. This process is based on H 2 PtCl 6 impregnation onto activated carbon followed by current pulses reduction. After each step of the process and during the electrochemical reduction, ex situ and in situ dispersive X-ray…
The effect of initial chain length before cross-linking and sulfur/accelerator amount during curing of natural rubber samples on network parameters (effective chain density, gel fraction, amount of chain ends, entanglement density, trapping factor, and relaxation and correlation times) is investigated by means of prot…
Low-density polyethylene (LDPE) filled with a small amount of titanium dioxide proves to be very suitable for studying the molecular motion of polyethylene by means of dielectric spectroscopy. The titanium dioxide acts as an oxidizing agent that introduces a small concentration of polar carbonyl groups, which does not…
The design, synthesis, and structural and magnetic properties of the two new bimetallic complexes [Sm(DMF)(4)(H(2)O)(2)Cr(CN)(6)].H(2)O and [Sm(DMF)(2)(H(2)O)(3)Cr(CN)(6)].H(2)O (DMF = N,N-dimethylformamide) are presented. [Sm(DMF)(4)(H(2)O)(2)Cr(CN)(6)].H(2)O was prepared by the reaction between Sm(3+) and [Cr(CN)(6)…