Materials Literature
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Abstract This paper discusses the prediction of the dispersed phase drop diameter in polymer blends considering the viscoelastic properties of polymers. The prediction is based on a simple force proportionality. Polymers are viscoelastic, and thus the elasticity of the matrix and the elasticity of the dispersed phase…
The elastic constants of several Al-based icosahedral alloys were measured over a temperature range from 4K to 1073 K by the rectangular parallelepiped resonance method. The values of the bulk moduli of these quasicrystals are similar to those of conventional cubic crystals having similar melting temperatures, while t…
The oxygen-induced ESR line broadening has been investigated in the case of the conducting polymer polyaniline in powder and in film form. Pumping under vacuum results in a narrowing of the ESR linewidth. After initial pumping various oxygen containing gases have been applied to the sample (pure ${\mathrm{O}}_{2}$, am…
We have studied the melt intercalation of polystyrene into organically modified sodium bentonite, a layered, mica-type silicate, using a variety of techniques. Wide-angle X-ray scattering experiments on polymer/silicate hybrid samples demonstrate that intercalation of polymer chains leads to an ∼25% increase in the sp…
α‐Octithiophene, the highest non‐substituted member of the α‐oligothiophene family known to date, has been obtained as razor‐blade thin, bright red single crystals shown between crossed polarizers on the cover of this issue. The synthesis, purification, crystal growth, and X‐ray analysis of the crystals are reported.…
The orthomanganites ${L}_{0.7}{A}_{0.3}\mathrm{Mn}{\mathrm{O}}_{3}$, $L=\mathrm{r}\mathrm{a}\mathrm{r}\mathrm{e}\ensuremath{-}\mathrm{e}\mathrm{a}\mathrm{r}\mathrm{t}\mathrm{h}\phantom{\rule{0ex}{0ex}}\mathrm{o}\mathrm{r}\phantom{\rule{0ex}{0ex}}\mathrm{Y}$ and $A=\mathrm{alkaline}\mathrm{earth}$, exhibit a first-orde…
The thiophene‐substituted Ru(L) complex shown in the Figure was synthesized and found to undergo polymerization when electrochemically oxidized. The electrochemical characteristics of the resultant polythiophene‐Ru(L) hybrid material were found to be a composite of those displayed by isolated Ru centers and the polyme…
We have found that a significant change in the local structure of ${\mathrm{La}}_{\frac{2}{3}}{\mathrm{Ca}}_{\frac{1}{3}}\mathrm{Mn}{\mathrm{O}}_{3}$ occurs between 80 K and temperatures above the Curie temperature, ${T}_{c}=270$ K. Near-edge x-ray-absorption spectra exhibits changes between 80 K and above ${T}_{c}$.…
Abstract A locally ordered microstructure of interconnected planar boroxol rings (basis structural units) in 1 to 2 mm thin 2D (two‐dimensional) platelets of a ternary borate glass, with cation ratio B 3+ /Ba 3+ (Fe 3+ ) ≈0.94, exhibits an up to 57 cm −1 increase in the infrared characteristic B‐O stretching vibration…
Abstract Poly(ether ether ketone) (PEEK)/poly(phenolphthalein ether sulfone) (PPES) block copolymers were synthesized by a condensation reaction of fluorine‐terminated PEEK oligomers and hydroxy‐terminated PPES oligomers. The content of PPES in the copolymers was varied from 12 to 44 wt.‐%, and the effect of the compo…
Abstract Microscopy techniques for direct visualization of phases in polymer blends are reviewed. Light microscopy is suitable for immiscible blends and contrast techniques include polarized light, phase contrast, differential interference contrast, and fluorescence. Each technique has an application for a particular…
Abstract The crystal structure of a tris(dithiolene)vanadium(IV) complex, [V(S2C2H2)3] (1), was determined. This complex shows the first instance of the nearly perfect D3h geometry in tris(dithiolene) vanadium(IV) complexes. In comparison with 1, the crystal structures of (NEt4)2[V(bdt)3] (bdt2− = 1,2-benzenedithiolat…
A coating emulsion was prepared using maltodextrins, carboxymethylcellulose, propileneglycol and a mixture of s orbit an fatty acid esters with an HLB of 6. The emulsion was sprayed on fully mature, unripened manila mangoes, which were the stored at 15 and 25C and 80–85% R.H. At 25C it was observed that rate CO2 produ…
Quasiperiodic long-range order is intermediate between spatial periodicity and disorder, and the excitations in one-dimensional (1D) quasiperiodic systems are believed to be transitional between extended and localized. These ideas are tested with a numerical analysis of two incommensurate 1D elastic chains: Frenkel-Ko…
BACKGROUND: Abundant availability of homeotic mutants in Bombyx mori provides us with clues to study the body plan of the silkworm. Previous studies indicated that the ECa/ECa and EN/EN embryos, which reveal drastic morphological changes (Itikawa 1943, 1952) lack the homologue of abd-A and the homologues of abd-A and…
By using TEM and X‐ray diffraction, the domain structure in ceramic LaNbO 4 has been studied. It has been found that the domains have two different orientations, separated by a boundary with_irrational Miller indexes between (20) I / (402) II and (20) I /(602) II lattice planes, which is in good agreement with the bou…
Structure factors for small, hydrothermally grown samarium orthoferrite, SmFeO 3 , were measured with focused λ = 0.7 Å synchrotron radiation. Approximate high symmetry in the Δρ images indicates that cations deform the electron density far more strongly than the O atoms. The most obvious effect is on distribution of…
Abstract Pore-lining chlorite is common in Rotliegend lake shoreline aeolian sandstones from northern Germany and preserves abnormally high primary intergranular porosity. In the north of the study area, in a basinward direction, the chlorites are Mg-rich while towards the south they become Fe-rich over a distance of…
Abstract A quantification technique useful in analysis of clay-rich deposits containing sepiolite and/or palygorskite has been developed by combining diffractometric and chemical data and represents a considerable improvement on classic quantification based on X-ray diffraction. The required data are: intensity ratios…
Abstract The control of the morphology of an immiscible polymer melt is of vital importance for the mastering of the final properties of the product. As polymer blends are produced using corotating twin‐screw extruders, understanding and modeling the changes experienced by the blend during this process is of great int…