Materials Literature
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Waste polystyrene containing additives was converted into a polymeric flocculant by a chemical modification. Specifically, waste polystyrene and waste high-impact polystyrene (HI-PS) containing rubber components or a coloring agent were sulfonated to produce a water-soluble polymer whose molecular weight ranged from 4…
Some ultrahigh molecular weight polyethylenes have been shown to be highly ductile but only under specific conditions. When the initial starting state is reactor powder, the ductility is presumed to be due to the low initial entanglement. Samples were prepared for such draw by compression molding of reactor powder tha…
Two kinds of FSM-type mesoporous silicas with different OH densities were prepared by calcination and acid treatment and modified with various silylating agents. The density of silanol groups in acid-treated FSM was about 1.5 times as large as that in calcined FSM (2.4 OH groups nm - 2 ), determined by thermogravimetr…
We have synthesized and evaluated five series of polymeric gadolinium chelates which are of interest as potential MRI blood pool contrast agents. The polymers were designed so that important physical properties including molecular weight, relaxivity, metal content, viscosity, and chelate stability could be varied. We…
A series of alkali metal-exchanged zeolites X and Y co-exchanged with small amounts (1 per unit cell) of methyl viologen (MV 2+ ) were prepared. The diffuse reflectance UV−vis spectra of the dried zeolites showed broad absorption bands in the 220−320-nm region. Decomposition of the bands revealed that each absorption…
Atomic force microscopy was used to study the surfaces of oxygen-plasma-treated polypropylene (PP), kraft pulp, filter paper, and wood. The effect of plasma treatment on the adhesion properties between PP film and wood was evaluated by means of a peel test. The highest adhesion to wood resulted from the shortest treat…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTDesign of New Organic Gelators Stabilized by a Host−Guest InteractionKazuhiko Inoue, Yoshiyuki Ono, Yasumasa Kanekiyo, Tsutomu Ishi-i, Kanami Yoshihara, and Seiji ShinkaiView Author Information Chemotransfiguration Project, Japan Science and Technology Corporation (JST), 2432 A…
Ideas developed to describe the simulated glass transition in simple models, like hard spheres, are applied to real materials in which temperature, rather than density, is the important variable. The free energy of a liquid is expressed in terms of the free energy of all the glasses that it samples. The assumption tha…
Platinum nanoparticles were prepared in an aqueous system using high-intensity ultrasound (200 kHz, 6 W cm - 2 ). The particles formed in the presence of a surfactant (sodium dodecyl sulfate, SDS) were stable, homogeneously spherical, and relatively monodispersed with an average 2.6 nm diameter. The rate of formation…
Novel thermosensitive poly(organophosphazenes) bearing methoxy-poly(ethylene glycol) (MPEG) and amino acid esters as substituents have been synthesized, and their lower critical solution temperature (LCST) was investigated. Differential scanning calorimetry (DSC) has shown that some of the polymers exhibit crystallini…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorDiscrete Yttrium(III) Complexes as Lactide Polymerization CatalystsBradley M. Chamberlain, Yongping Sun, John R. Hagadorn, Eric W. Hemmesch, Victor G. Young, Maren Pink, Marc A. Hillmyer, and William B. TolmanView Author Information Dep…
A method of preparing liquid crystal devices by phase separation of liquid crystal from its solution in a prepolymer, which results in adjacent layers of liquid crystal and polymer, is described. Liquid crystals in these phase-separated composite films exhibit electro-optical properties not observed in devices prepare…
The kinetics of the sonolytic degradation of aqueous solutions of carbon tetrachloride and hexachloroethane (C 2 Cl 6 ) were investigated at six different frequencies over the range from 20 to 1078 kHz. The rates of degradation of CCl 4 and C 2 Cl 6 were shown to increase with increasing frequency with optimal degrada…
A previous observation, which indicated that the β-relaxation intensity of o -terphenyl is sensitive to the thermal history, is substantiated by dielectric relaxation experiments. Unlike the β-processes of other materials, only the quenched glassy state of o -terphenyl displays this secondary relaxation feature. The β…
The bonding pattern of a covalent semiconductor is disrupted when a surface is cut while keeping a rigid (truncated bulk) geometry. The covalent bonds are partly reformed (with a sizeable energy gain) when reconstruction is allowed. We show that the ``electron localization function'' (ELF)---applied within a first--pr…
We investigate the influence of step edge diffusion (SED) and desorption on Molecular Beam Epitaxy (MBE) using kinetic Monte-Carlo simulations of the solid-on-solid (SOS) model. Based on these investigations we propose two strategies to optimize MBE growth. The strategies are applicable in different growth regimes: Du…
In this communication we propose the use of the Augmented Space Recursion as an ideal methodology for the study of electronic and magnetic structures of rough surfaces, interfaces and overlayers. The method can take into account roughness, short-ranged clustering effects, surface dilatation and interdiffusion. We illu…
We study the attractive interactions between rod-like charged polymers in solution that appear in the presence of multi-valence counterions. The counterions condensed to the rods exhibit both a strong transversal polarization and a longitudinal crystalline arrangement. At short distances between the rods, the fraction…
Conventional (CTEM) and high-resolution transmission electron microscopy (HRTEM) of Ag/SiO 2 and Ag/TiO 2 catalysts were combined with reaction studies of the hydrogenation of crotonaldehyde to examine the influence of the silver particle size on activity and selectivity toward the unsaturated alcohol. Nanostructural…
The magnetic circular dichroism (MCD) properties of a spin-allowed transition from an orbitally nondegenerate ground state manifold A to an orbitally nondegenerate excited state manifold J in the presence of spin-orbit coupling (SOC) are derived for any S >/= (1)/(2). Three physically distinct mechanisms are identifie…