Materials Literature
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The structure and properties of the H-bonded liquid crystalline (LC) polymer grafted onto fluorocarbon polymer substrate were studied by the FTIR spectroscopy technique. The grafted LC polymer brush was prepared via “grafting from” polymerization of 4-(6-acryloyloxyhexyloxy)benzoic acid initiated from the surface of U…
Desalkylierung von nBu2SnO mit 1,1′-Ferrocendicarbonsäure führt zu einem gemischtvalenten Sn-SnO4-Cluster. Der kubische Zinn-Sauerstoff-Kern ist mit sechs Ferroceneinheiten über zwölf Carboxylatbrücken so verbunden, dass die Eisenzentren die Ecken eines regulären Oktaeders besetzen (siehe Struktur).
Twin laws for trigonal, tetragonal and hexagonal crystals describing twins with principal axes inclined by an angle Phi > 0 are analysed. Twins by reticular merohedry (i.e. obliquity delta = 0) are possible only for certain values s of the axial ratio c/a. For any other axial ratio r, the laws describe twinning by ret…
Abstract Intrinsic true stress–true strain response was evaluated at room temperature for three linear polyethylene samples deformed in conventional tensile tests. It was observed that high crystallinity is associated with a low rate of strain hardening that results in a sharp neck and a large drop in nominal stress.…
Several new high μβ chromophores have been synthesized. These chromophores were intentionally designed to study structure−property relationships. The synthetic strategy that was followed has been described in our previous publications. Chromophore photostability was investigated from a structural point of view. Contac…
Cocrystallization and phase segregation in blends of poly(3-hydroxybutyrate- co -3-hydroxyvalerate) [PHBV] and poly(3-hydroxybutyrate- co -3-hydroxypropionate) [PHBP] at 80−100 °C were analyzed through the in situ observation of crystallization by FTIR microscopy and the measurement of melting curve by DSC. To trace t…
The demetalation process of 10 multi-iron Wells-Dawson polyoxometalates is studied by cyclic voltammetry and controlled potential coulometry. Eight sandwich-type complexes (alphaalphaalphaalpha-Na(16)[(NaOH(2))(2)(Fe(III))(2)(X(2)W(15)O(56))(2)], alphaalphabetaalpha-Na(14)[(NaOH(2))(Fe(III)OH(2))(Fe(III))(2)(X(2)W(15)…
Abstract As one member of high performance fibers, aromatic polyimide fibers possess many advantages, such as high strength, high modulus, high and low temperature resistance, and radiation resistance. However, the preparation of the high performance fibers is so difficult that the commercial fibers have not been prod…
New rod−coil copolymers based on poly( p -phenylene benzobisoxazole) (PBO) have been synthesized and characterized to explore a new ordered molecular structure at the supramolecular level for regulating photophysical properties and obtaining new blue light-emitting materials. The microstructure and physical properties…
The electronic structure of tetracyanoethylene (TCNE) has been studied both in its pristine state and upon stepwise rubidium intercalation, by UV and x-ray photoelectron spectroscopy as well as with theoretical calculations. The intercalated system may serve as a model for TCNE-based organometallic magnets, of which t…
Abstract The crystallization behavior, structure, and morphology developed was investigated for polypropylene containing different fillers such as silica, calcium carbonate, talc, mica, graphite, etc. by using compression‐molded samples prepared at several cooling rates. It was observed that the crystallinity obtained…
Abstract Clay was modified by trimethylchlorosilane; after modification, hydroxyl groups at the edge of layers were reacted and CEC value was drastically decreased. Polyethylene–clay composites were prepared by melt compounding. Wide angle X‐ray diffraction (WAXD) and transmission electron microscopy (TEM) showed that…
Inorganic fullerene-like structures (IF) of the layered hafnium sulfide, Hf 2 S, have been synthesized by the laser ablation of HfS 3 in tert -butyl disulfide medium. Apart from the Hf 2 S IFs exhibiting quasi-spherical as well as faceted nested-shell geometries, quasi-spherical nanoparticles of HfS were observed by t…
Abstract Methylene diphenyl diisocyanate (MDI) was used to compatibilize kraft lignin (KL)/soy protein isolate (SPI) blends. The structure and properties of the resultant composite materials were investigated with wide‐angle X‐ray diffraction, differential scanning calorimetry, dynamical mechanical thermal analysis, s…
Interactions between arc discharge single-walled carbon nanotubes within polymer composites have been well documented. Here hybrid systems of the conjugated organic polymer poly(p-phenylene vinylene-co-2,5-dioctyloxy-m-phenylene vinylene) (PmPV) and HiPco SWNTs are explored using UV/vis/NIR and Raman spectroscopy at 5…
Abstract This work concerns the micromechanical constitutive modelling, algorithmic implementation and numerical simulation of polycrystalline superelastic alloys under multiaxial loading. The model is formulated in finite deformations and incorporates the effect of texture. The numerical implementation is based on th…
Fabrication of controlled peptide nanofibers with homogeneous morphology has been demonstrated. Amphiphilic beta-sheet peptides were designed as sequences of Pro-Lys-X(1)-Lys-X(2)-X(2)-Glu-X(1)-Glu-Pro. X(1) and X(2) were hydrophobic residues selected from Phe, Ile, Val, or Tyr. The peptide FI (X(1)=Phe; X(2)=Ile) sel…
Perfect dendrimers that contain perfluorinated shells have recently attracted attention because they have been shown to encapsulate polar molecules in supercritical CO(2) and catalytically active metal nanoparticles in perfluorinated solvents. Moreover, they can then be easily separated after reaction from the biphasi…
Ge 2 Sb 2 Te 5 films were deposited by RF magnetron sputtering on Si(100)/SiO 2 substrates. N + ion was implanted into Ge 2 Sb 2 Te 5 films. Two obvious steps were observed in the resistance–temperature curve of the Ge 2 Sb 2 Te 5 -N film with a minor nitrogen implant dose. The two steps may change into one step becau…
There's room at the top: In the coordination sphere of hexacoordinate organosilanes with O- and N-donor ligands (see picture) the SiC bond is elongated and activated. This effect is so strongly pronounced that cleavage of one SiC bond and migration of this organo substituent takes place upon irradiation with UV ligh…