Materials Literature
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Abstract The dynamic rheological behavior of high‐density polyethylene (HDPE) composites filled with carbon black (CB) was studied by controlling periodic small shear strains at constant temperatures. The results shed light on the relationship between the behavior of dispersed fillers and polymeric matrix systems. At…
The new compounds K6Nb4S22 and K6Ta4S22 (I) have been synthesised by the reaction of NbS2 or Ta metal in a K2S3 flux. Using TaS2 as educt a second modification of K6Ta4S22 (II) is obtained. K6Nb4S22 and K6Ta4S22 (form I) crystallise in the monoclinic space group C2/c with a = 35.634 (2)Å, b = 7.8448 (4)Å, c = 12.1505…
Abstract The effects of compatibilization on the toughening of polypropylene (PP) by melt blending with styrene/ethylene‐butylene/styrene tri‐block copolymer (SEBS) in a twin‐screw extruder were investigated. The compatibilizers used were SEBS functionalized with maleic anhydride (SEBS‐g‐MA), PP functionalized with ac…
Abstract Interpenetrating polymer networks (IPNs) of polydimethylsiloxane (PDMS) and poly(2‐hydroxyethyl methacrylate) (PHEMA) were prepared by sequential method. The dynamic mechanical parameters of obtained IPNs and their variations with the structural composition were evaluated. The results for the IPNs were compar…
Wir beschreiben Synthese und Kristallstrukturen von fünf neuartigen Eisen/hpdta-Komplexen [{FeIII4(μ-O)(μ-OH)(hpdta)2(H2O)4}2FeII(H2O)4]·21H2O (2), (pipH2)2[Fe2(hpdta)2]·8H2O (4), (NH4)4[Fe6(μ-O)(μ-OH)5(hpdta)3]·20, 5H2O (5), (pipH2)1, 5[Fe4(μ-O)(μ-OH)3(hpdta)2]·6H2O (7), [{Fe6(μ3-O)2(μ-OH)2(hpdta)2(H4hpdta)2}2]·py·50…
New cadmium chalcogenide cluster molecules [Cd10E4(E'Ph)12(PnPr3)4], E = Te, E' = Te (1) and [Cd10E4(E'Ph)12 (PnPr2Ph)4] E = Te, E' = Se (2); E = Te E' = S (3); E = Se, E' = S (4) have been synthesized and structurally characterized by single crystal X-ray structure analysis. The influence of the variation of the chal…
An analysis of the elastic properties of syndiotactic polypropylene at different temperatures is reported. Fibers stretched at low temperatures are in the trans -planar form III, which transforms into the helical form II upon the release of the tension, whereas fibers stretched at high temperatures are in the stable h…
The goal of this work is to define the structural and sequence features common to sandwich-like proteins (SPs), a group of very different proteins now comprising 69 superfamilies in 38 protein folds. Analysis of the arrangements of strands within main sandwich sheets revealed a rigorously defined constraint on the sup…
We study nanograin size confinement effects, and the effect of the increase of local temperature on the first-order Raman spectrum in silicon nanogranular films obtained by cluster deposition. The local temperature was monitored by measuring the Stokes/antiStokes peak ratio with the laser power up to $\ensuremath{\sim…
Electrooxidation of the nickel dithiolene complex [Ni(F2pdt)2]–· (F2pdt2-: 6,6-difluoro-6,7-dihydro-5H-[1,4]dithiepine-2,3-dithiolato) affords the corresponding neutral complex [Ni(F2pdt)2]0 whose layered structure is highly reminiscent, albeit not isostructural, of that of the isosteric fluorinated bis(propylenedithi…
Derbe, gelblichgrüne Einkristalle des ternären Kupfer(I)-Praseodym(III)-Sulfids CuPrS2 entstehen bei der Umsetzung der Elemente (Kupfer, Praseodym und Schwefel) im molaren Verhältnis von 1:1:2 innerhalb von sieben Tagen bei 800°C in evakuierten Quarzglasampullen, wenn äquimolare Mengen an CsCl als Flußmittel zugegen s…
Abstract Poly(ethyl acrylate) (PEA)/SiO 2 hybrids with different compositions were prepared under different casting temperatures and pH values. Their morphology as investigated by transmission electron microscopy (TEM) shows that samples with different compositions have different morphologies. When the SiO 2 content i…
Abstract A new series of liquid crystalline polymers containing aromatic triad ester mesogen and 1,1′‐disubstituted ferrocene as a nonmesogenic unit along with polymethylene spacer was synthesized. The polymer was synthesized by a room temperature polycondensation reaction between bis(4‐chloroformyl phenyloxy alkyl fe…
Reaction of lithium phenylselenothiolate, generated in situ from the reductive cleavage of PhSe-SiMe3 with alkyl lithium reagents and insertion of elemental sulfur, with triphenylphosphine solubilized CuCl affords the molecular cluster complex [Cu20Se4 (μ3-SePh)12(PPh3)6] (1). The analogous reaction with AgCl yields t…
The hexachalcogenodistannates K6[SnIII2Se6] or Li4[SnIV2Te6]·8en were recently reported to simultaneously act as mild oxidants and chalcogenide sources in reactions with CoCl2/LiCp* (Cp* = pentamethylcyclopentadienide) while the Sn—E (E = Se, Te) fragment is not kept in the products, e.g. [(Cp*Co)3(μ3-Se)2], [(Cp*Co)3…
We examine quantitatively the temperature dependence of the linewidths and line shifts in electron paramagnetic resonance experiments on single crystals of the single-molecule magnets ${\mathrm{Fe}}_{8}$ and ${\mathrm{Mn}}_{12},$ at fixed frequency, with an applied magnetic field along the easy axis. We include interm…
Well-defined photochromic hybrid materials have been prepared by embedding spirooxazine dyes into matrices made of {(BuSn)12-O14(OH)6}2+ nano-building blocks assembled with α,ω-carboxymethyl poly(ethylene glycol) macromonomers (see Figure). Processed as 2–3 μm thick films, these materials exhibit fast and direct photo…
Molecular dynamics simulations are used to study a unique expanded jammed state. Tension transforms many glassy polymers from a dense glass to a network of fibrils and voids called a craze. Entanglements between polymers and interchain friction jam the system after a fixed increase in volume. As in dense jammed system…
β-Cyclodextrin (β-CD) inclusion compounds containing the lanthanide complexes Eu(NTA) 3 · x H 2 O and Gd(NTA) 3 · x H 2 O [NTA = 1-(2-naphthoyl)-3,3,3-trifluoroacetone)] were prepared by treating a saturated aqueous solution of β-CD with a solution of the complex in ethanol. The molar ratio of host to guest in the rea…
A diversity of zirconium-containing porous silicas of the MCM-41 type (Zr−MCM-41, ∞ ≥ Si/Zr ≥ 0.33) has been synthesized from aqueous solution using a cationic surfactant (CTABr = cetyltrimethylammonium bromide) as the structural directing agent, and starting from molecular atrane complexes of Zr and Si as precursors.…