Materials Literature
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Abstract In order to improve upon certain properties of gelatin graft copolymerization of acrylonitrile (AN) and methacrylonitrile (MAN) onto gelatin has been studied in aqueous medium using γ rays as a source of initiation. Optimum conditions for affording maximum percentage of grafting have been evaluated as a funct…
Abstract Binary blends of poly(caprolactone) (PCL) with cellulosic esters [cellulose diacetate (CDA), cellulose acetate–butyrate (CAB), and cellulose triacetate (CTA)] were studied by using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), and wide‐angle X‐ray scattering (WAXS) techniques, an…
The PbO loss during rapid thermal annealing of PbTiO3 thin films prepared by the sol-gel method has been investigated using electron probe microanalysis. The results have been correlated with the x-ray diffraction analyses and the dielectric properties of the films. The films start to loose PbO significantly during an…
Porphyrinisomere im Aufwind. Bis zur Entdeckung des Porphycens waren Porphyrinisomere völlig unbeachtete Tetrapyrrol‐Makrocyclen. Jetzt konnte ein als Corrphycen bezeichnetes neues Isomer als Tetraethyltetramethylderivat 1 in einer reduktiven Carbonylkupplung synthetisiert werden. 1 weist ein planares Ringgerüst auf u…
Abstract Thermal and flow properties of perlite‐filled high‐density polyethylenes (HDPE), studied in the first part of the paper, are discussed. Maximum peak temperatures of endotherms ( T mp ) and the corresponding relative peak heights were examined by differential scanning calorimetry (DSC). The data obtained from…
The thermoluminescence of ultraviolet- (250 nm) and X-ray-irradiated KCl:Eu 2+ is investigated. The peaks are located in the same positions independent of the radiation used to excite the sample, with differences only in the peak intensity ratios. Thermal and optical bleaching methods allow us to relate the thermolumi…
Abstract The effect of polymer structure on blend miscibility with polyvinylphenol (PVPh) has been studied for at least one polymer from a variety of polymer classes with potential hydrogen‐bond accepting groups: polyesters (aliphatic and aromatic), polycarbonates, polyimides, polyamides, polysulfones, polyurethanes,…
We reexamine the density functional theory of laser-induced freezing, i.e., the freezing of a colloidal liquid into crystalline order in the presence of an external periodic modulating potential ${V}_{e}$ with its wave vectors tuned to the ordering wave vector in the liquid phase. We show definitively that the initial…
Variation of the preparation conditions of porous silicon carbide is shown to have a strong effect on the structural and electrical properties of the material obtained. A correlation has been observed between the fiber size and resistivity of porous SiC, a decrease of fiber size results in a semi-insulating material d…
Abstract Four different types of high‐density polyethylenes (HDPE) were blended with perlite at different concentrations. Silane coupling agent γ‐aminopropyltriethoxv silane (γ‐APS, A‐1100) was used to enhance the adhesion between perlite and HDPEs. Ultimate tensile strength and elastic modulus increased as the perlit…
The very high pressures (>1 GPa) that occur during the final stages of collapse of a cavitation bubble force the liquid near the bubble wall briefly (\ensuremath{\sim}1 ns) into a metastable state of subcooling, relative to the equilibrium phase diagram. Estimates for water show that solidification in the form of h…
We calculate the electrical conductivity, thermopower, and the electronic contribution to the thermal conductivity of a superlattice, with the electric field and the thermal gradient applied parallel to the interfaces. We include the tunneling between quantum wells. The broadening of the lowest subband when the period…
We show that arrays of tunnel junctions between normal metal electrodes exhibit features suitable for primary thermometry in an experimentally adjustable temperature range where thermal and charging effects compete. $I\ensuremath{-}V$ and $\frac{\mathrm{dI}}{\mathrm{dV}}$ vs $V$ have been calculated for two junctions…
Due to the overbinding that is inherent in existing {\em local} approximations to the density-functional formalism, certain reaction energies have not been accessible. Since the generalized gradient approximation significantly decreases the overbinding, prospects for density-functional-based reaction dynamics are prom…
We derive a stochastic nonlinear equation to describe the evolution and scaling properties of surfaces eroded by ion bombardment. The coefficients appearing in the equation can be calculated explicitly in terms of the physical parameters characterizing the sputtering process. We find that transitions may take place be…
The flow-graph approach (FGA) is applied to optical analysis of isotropic stratified planar structures (ISPS's) at inclined light incidence. Conditions for the presence of coherent and noncoherent light interaction within ISPS's are determined. Examples of the use of FGA for calculation of the transmission and the ref…
A colloidal suspension becomes unstable when a sufficient amount of non-ionic surfactant is added, undergoing a segregation process ascribable to depletion forces induced by the surfactant micelles. The concentrated phase which separates out is, however, less compact than theoretically expected and shows stable gel-li…
We study metastable PolyDimethylSiloxane (PDMS) films deposited on a substrate of fluorinated PDMS: after nucleation, a hole grows at constant velocity V. V is inversely proportional to the substrate viscosity and is proportional to - S , where S (< 0) is the spreading parameter. The velocity is a decreasing function…
The weak interplanar bonding in graphite is studied in the DFT formalism. The decomposition of the cohesive energy in its kinetic, electrostatic and exchange-correlation parts, coupled with the analysis of charge transfer, reveal an interplay between electronic delocalization and van der Waals contributions to the bon…
Reaction of pseudo-boehmite, [Al(O)(OH)] n, with carboxylic acids (RCO 2 H) results in the formation of the carboxylate-alumoxanes, [Al(O) x (OH) y (O 2 CR) z ] n where 2x + y + z = 3 and R = C 1 - C 13 . The physical properties of the alumoxanes are highly dependent on the identity of the alkyl substituents. The alum…