Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPolyphosphazene−Polystyrene Copolymers: Block and Graft Copolymers from Polyphosphazene and Polystyrene MacromonomersRobbyn Prange, Scott D. Reeves, and Harry R. AllcockView Author Information Department of Chemistry, The Pennsylvan…
The effect (Stark effect) of an applied electric field on the electronic states of molecular adsorbates was studied by measuring surface plasmon resonance (SPR) as a function of the wavelength of the incident light that excites the SPR. Using the Kramers-Kronig relation, Stark spectra comparable to those obtained with…
The charge carrier dynamics in illuminated nanoporous ZnO electrodes consisting of 5 nm particles were investigated. Stable photocurrent quantum efficiencies of 15−30% and photovoltages of up to 0.4 V were found in the presence of the I - /I 3 - redox couple in propylene carbonate. The electronic transport in these Zn…
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…