Materials Literature
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This paper discusses the evolution observed in the field of high performance polymers and tries to forecast the future in different domains. The paper is divided into four sections: 1. From the 1960s to the 21st century. 2. What’s new in chemistry and why? 3. What could be the future for high performance polymers in s…
For mass production of poly(3-hydroxybutyrate) (PHB), high cell density cultures of Ralstonia eutropha were carried out in 2.5-1 and 60-1 fermentors by two fed-batch culture techniques of nitrogen and phosphate limitation. When the nitrogen limitation technique was employed using both an on-line glucose monitoring and…
Multianvil experiments in the model system MgO-Al 2 O 3 -SiO 2 -H 2 O at 680 °C and 5.2-6.0 GPa yield a variety of Mg,Al-rich mineral assemblages containing pumpellyite-type phases. Run products include the assemblages pumpellyite-coesite, pumpellyite-forsterite-orthoenstatite and pumpellyite-10 Å phase. The pumpellyi…
This paper presents an experimental study on needle heating in sewing heavy materials such as upholstery fabrics. In the experiments, infrared (IR) radiometry, high speed line scanning IR radiometry, and high speed IR radiometry are used to obtain thermal images of the needle during sewing. In particular, IR radiometr…
Dilatometric studies were performed on the nematic and isotropic phases of the homologous series of alkyl-cyano-biphenyl liquid crystals CnH2n+1C6H4C6H4. CN for n = 5 to 9. From these studies the coefficient of volume expansion (a) of the liquid crystal is estimated. Using this data a number of thermoacoustic and an h…
By using a combination of high resolution electron microscopy (HREM) and nanoanalytical electron microscopy (EELS-STEM) techniques, the nanoscale evolution of a 5% Pt/Ce 0.8 Tb 0.2 O 2- x catalyst submitted to reduction in pure hydrogen within the 423−1173 K range has been investigated. Fine details about the platinum…
Im Rahmen unserer Untersuchungen zur Reaktivität und zum Synthesepotential von metastabilen Aluminium(I)-halogenidlösungen haben wir Reaktionen dieser Lösungen mit SiCp und GeCp ausgeführt. Dabei konnten neben einem ungewöhnlichen Cluster mit SiAl14-Gerüst, der an einer anderen Stelle beschrieben wurde, die Verbindung…
OBJECTIVE: Due to the thrombogenicity and permanent implant nature of metallic stents, bioresorable synthetic polymers have been proposed for stents and local drug delivery systems. Bioresorbable polyesters like poly(D,L-lactide) demonstrated excellent biocompatibility in various tissues. This paper describes a novel…
Slow dynamics of complex domain structures in phase separating polymer systems is investigated with the use of the self-consistent field (SCF) dynamic density functional (DDF) technique where the free energy of the system is calculated using the path integral formalism of the polymer chain conformation. We apply this…
Article Redetermination of the crystal structure of tetrasodium tetrahedrotetrastannide, Na4Sn4 and tetrapotassium tetrahedro-tetrastannide, K4Sn4 was published on December 1, 1999 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 214, issue 4).
The paramagnetic complexes di(mesityl)([5]trovacenyl)borane (5·), (mesityl)di([5]trovacenyl)borane (6··), and tri([5]trovacenyl)borane (7···) were prepared from [5]trovacenyllithium, (η5-C7H7)V(η5-C5H4Li), and (Mes)2BF, (Mes)BF2, and BF3, respectively. The propeller-shaped species 5·, 6··, and 7··· were subjected to X…
Polycarboxylic acids containing more than three carboxylic acid groups react with hydroxyl groups in cotton cellulose and crosslink cotton through stable ester bonds. The aim of this research is to use variable temperature diffuse reflectance infrared spectros copy to study anhydride formation from the thermal dehydra…
Abstract The deintercalation of a low-defect kaolinite intercalated with hydrazine was studied by X-ray diffraction, diffuse reflectance infrared spectroscopy (DRIFT), and Raman microscopy over 30 d. X-ray diffraction showed that the kaolinite was fully intercalated. More than 120 h were required for the hydrazine-int…
Surface Brillouin scattering (SBS) has been used to examine the elastic properties of a supported gold film at high pressure. The velocities of the acoustic modes of a 99 nm thick film have been measured to a pressure of 4.8 GPa, by means of a gem anvil cell with cubic zirconia anvils. A large stiffening of the film h…
Abstract The results of an experimental characterization of the elastic and failure behavior of several 3‐D textile composites under tension, compression, shear, and bending loads are reported in this paper. Composites reinforced with several textile preforms comprising of layer‐to‐layer weaves, through‐the‐thickness…
Semiaromatic polyimides with a polyalicyclic structure were prepared by the polycondensation of bis(aminomethyl)bicyclo[2.2.1]heptane (BBH) with aromatic dianhydrides. The corresponding poly(amic acid)s possessed an inherent viscosity range of 0.60–1.00 dl g −1 . The polyimides were soluble in organic polar solvents a…
Pure head to head (H–H) addition polymers, such as H–H polyolefins, H–H acrylates and H–H poly(vinyl halides), have been of interest for the understanding of the structure/properties relationship of addition polymers. These polymer structures have provided challenges of synthesis, characterization and of the measureme…
A series of MnIII porphyrins progressively halogenated in the β-pyrrolic positions was employed to catalyse the epoxidation of cis-stilbene by iodosylbenzene, and to study the role of the electronic effects on the stereoselectivity of this process. A gradual improvement in the stereoselectivity on increasing the numbe…
Semiconductor boron-doped CVD diamond films were prepared on Si substrates by the hot filament technique. The surface morphology analysis by SEM presented continuous and well faceted films. The samples were grown with different boron concentrations by controlling the B/C ratio in the feeding gas. Raman results showed…
Artificial SrTiO 3 /SrO superlattice thin films epitaxially grown on SrTiO 3 substrates were fabricated by pulsed laser deposition. The artificial superlattices were designed and fabricated by introducing a Ruddlesden-Popper (RP) layer periodically. The intensity of reflection high-energy electron diffraction (RHEED)…