Materials Literature
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Intimate electrical contact occurs between a substituted poly(metaphenylenevinylene) (PmPV) and bundles of single-walled nanotubes (SWNT) as evidenced by atomic force microscopy, optical, and electronic measurements carried out on single, isolated SWNT/PmPV structures (see picture). PmPV may provide a useful route tow…
Slow magnetic relaxation and hysteresis effects of dynamic origin have been observed above liquid helium temperature in a chain compound (see picture), comprising CoII centers and organic radicals, without any evidence of phase transition to three-dimensional magnetic order. These results are the first evidence of the…
Abstract The viscosity, ultrasonic velocity, refractive index, and density of cellulose acetate/carboxylated poly(vinyl chloride) (CA/C‐PVC) blends in cyclohexanone, a common solvent, were measured at 30°C. After casting films of the blend for a 50:50 composition, polarizing micrographs were taken. Using the viscosity…
The K -shell ionization cross sections of Cu and Ga are measured by electron impact and the data of Ga are reported for the first time. The method of a thin chemical compound target with a thick substrate is formally used in the experiment. The influence of electrons reflected from the substrate is corrected by means…
An electronic structure of ferroelectric PbZr 1/2 Ti 1/2 O 3 is presented. The full potential linearized augmented plane wave method is used and the exchange correlation effects are treated by the generalized gradient approximation. In order to understand the ferroelectricity of PbZr 1/2 Ti 1/2 O 3 , the density of st…
Abstract Young's moduli of a series of quenched isotactic polypropylene/high‐density polyethylene blends were measured. The moduli of many of the blends exceeded the upper bound, calculated from the parallel model with the moduli of the two quenched homopolymers as those of the two components. In fact, both components…
Two-dimensional maps of x-ray diffuse scattering (DS) in a reciprocal space for a real crystal containing Coulomb deformation centres (clusters or dislocation loops) were calculated using a new dynamical theory developed for a crystalline media with homogeneously distributed defects. Such maps were calculated for both…
The structural interface properties of layered Pt/Ti/SiO 2 /Si electrodes have been investigated using high-resolution specular and diffuse x-ray reflectivity under grazing angles. Currently this multilayer system represents a technological standard as bottom electrodes for ferroelectric thin-film applications. For th…
Abstract We attempted to introduce crosslinking into poly(butylene adipate‐ co ‐succinate) (PBAS) to improve the properties, such as the mechanical strength and elasticity, by a simple addition of dicumyl peroxide (DCP). Prior to curing, the thermal stability of PBAS was investigated. Above 170°C PBAS was severely deg…
Abstract In this study the thermal and mechanical behaviors of PP/mica composites, under dynamic conditions, are discussed on the basis of the changes induced by the presence of the interfacial modifier succinic anhydride–grafted atactic polypropylene, with different degrees of grafting, prepared in our laboratories b…
Macro- and micro-photoluminescence (PL) spectroscopy has been applied to investigate the exciton localization in cubic CdS/ZnSe type-II superlattices (SL) in the temperature range 5-35 K. The non-monotonic shift of the macro-PL peak with increasing temperature reveals the kinetic contribution of acoustic-phonon-assist…
Abstract This article describes the structure and electrical performance of positive‐temperature‐coefficient/negative‐temperature‐coefficient (PTC/NTC) effects of the following three‐component blends: poly(4‐methyl pentene‐1)/ultra‐high molecular weight polyethylene/carbon black (TPX/UHMWPE/CB), poly(4‐methyl pentene‐…
The in vitro hydrolytic degradation of thin (ca. 100 μm) films of poly(glycolic acid) (PGA) has been studied, focusing on the kinetics of degradation of the near surface phases. The emphasis of this work is to describe the nature of the initial “induction” period of hydrolysis of biodegradable polyesters, where water…
We report high-resolution angle resolved photoemission studies of $2H\ensuremath{-}{\mathrm{NbSe}}_{2}$ and $2H\ensuremath{-}{\mathrm{TaS}}_{2}.$ Results are compared to those of $2H\ensuremath{-}{\mathrm{TaSe}}_{2}.$ We find that the normal state electronic structures in this family of materials have the same basic c…
Monodispersed poly( l -lactide)- block -poly(oxyethylene) (PLLA−PEG) and poly( l -lactide)- block -poly(oxyethylene)- block -poly( l -lactide) (PLLA−PEG−PLLA) were synthesized, and their nanoparticles were successfully prepared in an aqueous medium. Both particles of the di- and triblock copolymers were nanoscale in s…
Abstract Blend films of poly( L ‐lactide) (PLLA) and poly(vinyl alcohol) (PVA) were obtained by evaporation of hexafluoroisopropanol solutions of both components. The component interaction, crystallization behavior, and miscibility of these blends were studied by solid‐state NMR and other conventional methods, such as…
Structural characterization of a fully etched amorphous W/Si multilayer grating with a lateral periodicity of 800 nm is performed by x-ray reflectivity in the coplanar and non-coplanar modes using a scintillation detector and a two-dimensional gas-filled detector, respectively. Three-dimensional reciprocal space const…
The templating of the ordered nanostructures of lyotropic liquid crystals (LLC) onto organic polymers has recently been of great interest. This work describes the polymerization and segregation behavior of polar and nonpolar monomers in an LLC environment. Nonpolar monomers partition to the oil-soluble domains of the…
Abstract The rheological and electric properties of blends of poly(ethylene terephthalate) (PET) and high‐density polyethylene (HDPE) filled with various types of carbon black (CB) were analyzed in detail in this project. Four types of CB samples with available values of surface area, particle size, porosity, density,…
The dilute-solution dynamical properties of dendrimers in a good solvent are derived in the framework of the Rouse−Zimm approach. On the basis of a normal-coordinates treatment with preaveraged hydrodynamic interaction, we obtain the spectrum of relaxation times and some dynamical observables such as the viscoelastic…