C. K. Radhakrishnan、A. Sujith、G. Unnikrishnan 等 4 位作者2004-08-09Journal of Applied Polymer Science
Abstract Blends of styrene–butadiene rubber (SBR) and poly(ethylene‐ co ‐vinyl acetate) (EVA) with different ratios were prepared with a two‐roll mixing mill and were vulcanized by three different crosslinking systems, namely, sulfur (S), dicumyl peroxide, and a mixture consisting of S and peroxide (mixed). The vulcan…
Polymer crystallization and propertiesEpoxy Resin Curing ProcessesPolymer Nanocomposites and Properties
Jeng‐Yueh Shieh、Pei‐Hsuan Hsu、Chun‐Shan Wang2004-08-09Journal of Applied Polymer Science
Abstract A series of soluble novel polyesterimides was synthesized from diamines [a mixture of 2,2‐bis(4‐(4‐aminophenoxy)phenyl)propane (BAPP) with amine‐terminated polysiloxane (ATPS) in various mole ratios] and the ester‐group‐containing dianhydrides. The ester group containing dianhydrides in turn was synthesized b…
Silicone and Siloxane ChemistryEpoxy Resin Curing ProcessesSynthesis and properties of polymers
Christel Nonnenberg、Irmgard Frank、Thomas M. Klapötke2004-08-09Angewandte Chemie
Hochreaktive Zwischenstufen treten unter bestimmten Bedingungen im hypergolen Gemisch aus Monomethylhydrazin und Distickstofftetroxid auf (siehe Bild) und führen zu einem unkontrollierten Reaktionsverhalten. Car-Parrinello-Moleküldynamiksimulationen ermöglichen einen Einblick in das komplexe Reaktionsgeschehen auf kür…
Lanthanide and Transition Metal ComplexesCatalysis and Oxidation ReactionsThermal and Kinetic Analysis
Jingzhi Zhang、Ya Cao、Yuhui He2004-08-09Journal of Applied Polymer Science
Abstract A polymeric surfactant based on carboxymethyl cellulose and alkyl poly(etheroxy) acrylate (CMC‐A9) was used in ultrasonically irradiated emulsion polymerization of styrene. Polystyrene nanoparticles (30–60 nm) with high molecular weight were prepared. Compared with the conventional emulsion polymerization, th…
Ultrasound and Hyperthermia ApplicationsUltrasound and Cavitation PhenomenaInnovative Microfluidic and Catalytic Techniques Innovation
M. Hostettler、Karl W. Törnroos、Dmitry Chernyshov 等 5 位作者2004-08-09Angewandte Chemie
Ähnlich und doch anders: Die Kristallstrukturen von sechs Alkoholsolvaten des Tris(2-picolylamin)eisen(II)-dichlorids (siehe Formel) sind bei 200 K sehr ähnlich, ihr Spin-Crossover- und Phasenumwandlungsverhalten unterscheidet sich aber deutlich. Konsequenzen dieser Beobachtung für das Kristall-Engineering werden erör…
Electron Spin Resonance StudiesMagnetism in coordination complexesLanthanide and Transition Metal Complexes
Yun Chen、Lina Zhang2004-08-09Journal of Applied Polymer Science
Abstract We have successfully prepared a series of blend membranes from cellulose and soy protein isolate (SPI) in NaOH/thiourea aqueous solution by coagulating with 5 wt % H 2 SO 4 aqueous solution. The structure and properties of the membranes were characterized by Fourier transform infrared spectroscopy, ultraviole…
Nanocomposite Films for Food Packagingbiodegradable polymer synthesis and propertiesAdvanced Cellulose Research Studies
Siyaqi Li、X. G. Gong2004-08-09Physical Review B
The structures of ${\text{Al}}_{12}\mathrm{C}$ and ${\text{Al}}_{12}{\mathrm{C}}^{\ensuremath{-}}$ clusters are studied by using the density functional theory. We find that the charging on the icosahedral ${\text{Al}}_{12}\mathrm{C}$ cluster drives the carbon atom from the center of the cluster to its surface. The opt…
Boron and Carbon Nanomaterials ResearchSuperconductivity in MgB2 and AlloysFullerene Chemistry and Applications
C. Drevelle、Sophie Duquesne、Michel Le Bras 等 8 位作者2004-08-09Journal of Applied Polymer Science
Abstract The thermal behavior of an acrylic binder resin used in back coatings for textile applications was studied. The influence of the crystalline form of the fire‐retardant additive on the thermal behavior was investigated. This resin formed a carbon char during its thermal degradation, so it may be assumed that i…
Thermal and Kinetic AnalysisSilicone and Siloxane ChemistryFlame retardant materials and properties
Jian‐Feng Chen、Guoquan Wang、Xiaofei Zeng 等 7 位作者2004-08-09Journal of Applied Polymer Science
Abstract Nanocomposites of nanosized CaCO 3 /polypropylene–ethylene copolymer (PPE) and nanosized CaCO 3 /PPE/styrene–butadiene–styrene (SBS) were prepared by using a two‐roll mill and a single‐screw extruder. By adding CaCO 3 nanoparticles into the PPE matrix, the toughness of the matrix substantially improved. At a…
Polymer crystallization and propertiesMechanical Behavior of CompositesPolymer Nanocomposites and Properties
Martin Pley、Mathias S. Wickleder2004-08-09Angewandte Chemie
Pt2-Hantel geclustert: Bei der Reaktion von Platinnitrat mit konzentrierter Schwefelsäure bei 350 °C bildet sich das tiefrote Oxidsulfat (NH4)Pt3O2(SO4)3, in dem sechs Pt26+-Hanteln durch Oxidionen und Sulfatgruppen zu dem Clusteranion [Pt12O8(SO4)12]4− verknüpft sind (siehe Bild). Der Grundkörper dieses Anions entspr…
Chemical Synthesis and CharacterizationPolyoxometalates: Synthesis and ApplicationsMetal-Organic Frameworks: Synthesis and Applications
Miroslav P. Pavlov、João F. Mano、Nuno M. Neves 等 4 位作者2004-08-09Macromolecular Bioscience
The aim of this work is the production of fibers from biodegradable polymers to obtain 3D scaffolds for tissue engineering of hard tissues. The scaffolds required for this highly demanding application need to have, as well as the biological and mechanical characteristics, a high degree of porosity with suitable dimens…
Electrospun Nanofibers in Biomedical Applicationsbiodegradable polymer synthesis and propertiesBone Tissue Engineering Materials
Keigo Kamata、Kazuya Yamaguchi、Noritaka Mizuno2004-08-09Chemistry - A European Journal
The highly chemo-, regio-, and diastereoselective and stereospecific epoxidation of various allylic alcohols with only one equivalent of hydrogen peroxide in water can be efficiently catalyzed by the dinuclear peroxotungstate, K2[[W(=O)(O2)2(H2O)]2(mu-O)].2H2O (I). The catalyst is easily recycled while maintaining its…
Polyoxometalates: Synthesis and ApplicationsOxidative Organic Chemistry ReactionsChemical Synthesis and Reactions
Martin Pley、Mathias S. Wickleder2004-08-09Angewandte Chemie International Edition
Platinum dumbbells: The reaction of platinum nitrate with concentrated sulfuric acid at 350 °C leads to the deep red oxide–sulfate (NH4)Pt3O2(SO4)3, in which six [Pt2]6+ dumbbells are linked by oxide ions and sulfate groups to the novel cluster anion [Pt12O8(SO4)12]4− (see picture). The structure of the core of this a…
Polyoxometalates: Synthesis and ApplicationsInorganic Chemistry and MaterialsCrystal Structures and Properties
Seon Hoon Ahn、Seong Hun Kim、Seung Goo Lee2004-08-09Journal of Applied Polymer Science
Abstract The effect of stearic acid modification on the dispersity of silica nanoparticles and the adhesion between the filler and polymer matrix with stearic acid concentration were investigated. The wettability of silica nanoparticles was improved by the addition of stearic acid. The presence of adsorbed stearic aci…
Polymer Nanocomposites and Propertiesbiodegradable polymer synthesis and propertiesPolymer crystallization and properties
G. D. Mahan、Gun Sang Jeon2004-08-09Physical Review B
Phonons are calculated for single wall carbon nanotubes. Eigenvalues and eigenvectors are presented for armchair and zig-zag tubes. The model contains just three adjustable spring constants: two for first and second nearest neighbor directed bonds, and a third for radial bond-bending interactions. There are four low f…
Force Microscopy Techniques and ApplicationsMechanical and Optical ResonatorsCarbon Nanotubes in Composites
A. P. Litvinchuk、M. N. Iliev、M. Pissas 等 4 位作者2004-08-09arXiv
We report an infrared reflection spectroscopy study of La$_{1/2}$Ca$_{1/2}$MnO$_3$ over a broad frequency range and temperature interval which covers the transitions from the high temperature paramagnetic to ferromagnetic and, upon further cooling, to antiferromagnetic phase. The structural phase transition, accompani…
Materials ScienceStrongly Correlated Electrons
H. B. Su、D. O. Welch、Winnie Wong-Ng2004-08-09arXiv
The energetics of Schottky defects in 123 cuprate superconductor series, $\rm REBa_2Cu_3O_7$ (where RE = lanthandies) and $\rm YAE_2Cu_3O_7$ (AE = alkali-earths), were found to have unusual relations if one considers only the volumetric strain. Our calculations reveal the effect of non-uniform changes of interatomic d…
SuperconductivityMaterials Science
H. B. Su、Alejandro Strachan、William A. Goddard III2004-08-09arXiv
We use first principles methods to study static and dynamical mechanical properties of the ferroelectric polymer Poly(vinylidene fluoride) (PVDF) and its copolymer with trifluoro ethylene (TrFE). We use density functional theory [within the generalized gradient approximation (DFT-GGA)] to calculate structures and ener…
Soft Condensed MatterMaterials Science
B. J. Ruck、A. Koo、U. D. Lanke 等 10 位作者2004-08-09arXiv
The structure of disordered GaN:O films grown by ion-assisted deposition is investigated using x-ray absorption near-edge spectroscopy and Raman spectroscopy. It is found that between 4 and 21 % of the nitrogen in the films is in the form of molecular N_2 that interacts only weakly with the surrounding matrix. The ani…
cond-mat.dis-nnMaterials Science
M. A. Continentino、A. S. Ferreira、P. G. Pagliuso 等 5 位作者2004-08-09arXiv
Recently we have shown that $YbInCu_4$ and related compounds present a solid state Pomeranchuk effect. These systems have a first order volume transition where a local moment phase coexists with a renormalized Fermi liquid in analogy with $^3He$ at its melting curve. We demonstrate here experimentally that the solid s…
Strongly Correlated ElectronsMaterials Science