Materials Literature
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A unique interfacial reactivity of self-assembled mesostructured silica−surfactant systems toward organosilanes was utilized to obtain ordered mesoporous materials such as MCM-41 with different surface functionality. The idea of this process is based on a direct replacement of electrostatic interactions between negati…
Poly(butylene terephthalate) (PBT) was depolymerized in excess methanol at high-temperature (473–523 K) and high-pressure (4–14 MPa) conditions. Considering the critical point of methanol (512.6 K, 8.09 MPa), the reaction pressure was varied over the range of 6–14 MPa at the reaction temperature of 513 K. As a result,…
This paper is concerned with studies of the absorbance spectrum of an electrode modified with a submonolayer of cadmium sulfide nanoparticles. It is shown that the absorbance is potential dependent; a near band-edge bleaching is reported at negative potentials. The bleaching closely resembles that reported in radiolys…
A new family of terephthalate-based copolyesters has been found to exhibit high impact resistance combined with good thermal properties, ultraviolet stability, optical clarity, and low color. These engineering thermoplastic compositions were prepared using conformationally rigid cis / trans -2,2,4,4-tetramethyl-1,3-cy…
We evaluate the effect of finite aperture gratings on the spectral and efficiency characteristics of guided-mode resonance filters. A simple analytical model based on the attenuation properties of the waveguide and a fixed length of the grating aperture is developed. The results from this model are in good agreement w…
CMK-1 ordered mesoporous carbons were synthesized using MCM-48 silica templates with a wide range of unit-cell parameters and pore sizes. Sucrose and furfuryl alcohol were employed as carbon precursors. It was confirmed that the isolation of the CMK-1 carbon via dissolution of the MCM-48 template is accompanied by a s…
Experimental solubilities are reported for anthracene dissolved in ternary 1,4-dioxane + 1-propanol + cyclohexane, 1,4-dioxane + 2-propanol + cyclohexane, 1,4-dioxane + 1-butanol + cyclohexane, 1,4-dioxane + 2-butanol + cyclohexane, and 1,4-dioxane + 2-methyl-1-propanol + cyclohexane solvent mixtures at 25 °C and atmo…
The good-solvent expansion of dendrimers is theoretically studied by self-consistent free-energy minimization accounting for all the relevant degrees of freedom. This feature enables a description both of the local conformation and of the overall molecular behavior. Equilibrium and dynamical properties are calculated,…
Miscibility, rheology, and free volume properties of blends of thermotropic liquid crystalline polymers (TLCPs) (Vectra A950) and polycarbonate (PC) are studied in this work. Despite the unusual increase in Tg of the PC phase, the blends are found to be generally immiscible. Transesterification may occur during blendi…
Homogeneous nucleation of crystallizing n -alkanes (CH 3 −(CH 2 ) n-2 −CH 3, 17 ≤ n ≤ 60) and some low-MW polyethylene (PE) fractions were studied using calorimetry and compared to reanalyzed PE data of Ross and Frolen. The undercooling and derived surface energy of the n -alkanes starts increasing for n as low as 25,…
Much experimental effort to realize possible uses of dendrimers has focused on the complexation of charged dendrimers to oppositely charged polyelectrolytes to form controlled delivery systems. Employing computer simulation and theory, we present a molecular-level picture of these guest−host aggregates and the conditi…
Nanoparticles of various dimensions of II−VI binary chalcogenides CdSe, PbSe, and Cu 2 - x Se, have been prepared by a very simple fast reaction between acetates or sulfates of Cd, Pb, and Cu and Na 2 SeSO 3 in the presence of complexating agents, using microwave irradiation. The nanoparticles were analyzed by X-ray d…
Facilitated transport of oxygen was investigated in ethyl cellulose membranes containing cobalt(II) meso-tetrakis (substituted phenyl) porphyrins [CoTPP, CoT(2-Cl)PP, CoT(4-Cl)PP, CoT(4-MeO)PP, and CoT(2,4-2MeO)PP] as fixed oxygen carriers. The oxygen permeability (P) and oxygen/nitrogen selectivity (P/P) of the membr…
The kinetics of polycondensation and copolycondensation reactions of bis(3-hydroxypropyl) terephthalate (BHPT) and bis(2-hydroxyethyl) terephthalate (BHET) as monomers were investigated at 270°C, in the presence of titanium tetrabutoxide (TBT) as a catalyst. BHPT was prepared by ester interchange reaction of dimethyl…
The [Cr2(azin)4Cl2]2- ion has been made and structurally characterized. Despite the long Cr−Cr distance (2.688(2) Å), there is strong coupling of all electron spins, presumably by superexchange via the bridging azin ligands (azin = anion of 7-azaindole).
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Effect of ethyl and n-octyl branches on the properties of poly(ethylene adipate) (PEA) and poly(butylene succinate) (PBS) were investigated. Glass transition and melting temperature, crystallinity, melt viscosity, and spherulite growth rate were decreased with an increase in the degree of the chain branches. Introduct…
Wormlike dendrimers made of flexible and noninteracting segments were synthesized. Starting from a poly(methylhydrosiloxane) G 0 and using short propylsilane branches, the synthesis did not go beyond the second generation, as predicted from steric congestion. The starting polymer and the G 1 and G 2 dendrimers synthes…
Radiation induced grafting of acrylic acid onto polyethylene film was investigated. The grafted films rapidly adsorbed Cu2+, Cd2+, Th4+, and UO ions in high efficiency. The carboxylic acid groups on AAc-grafted PE film acted as a chelating site for the selected metal ions. Complex formation of metal ions and carboxyli…
The temperature-dependent resistivity behavior of carbon black–loaded polyethylene (PE) composites irradiated both at room temperature and 170°C above the PE melting point was studied. The irradiation doses were varied. At a given loading level, irradiation at room temperature corresponded to an energy treatment on a…