Materials Literature
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AB block copolymers of ϵ-caprolactone and (L)-lactide could be prepared by ring-opening polymerization in the melt at 110°C using stannous octoate as a catalyst and ethanol as an initiator provided ϵ-caprolactone was polymerized first. Ethanol initiated the polymerization of ϵ-caprolactone producing a polymer with ϵ-c…
Empirical force field parameters for nicotinamide (NIC+) and 1,4-dihydronicotinamide (NICH) were developed for use in modeling of the coenzymes nicotinamide adenine dinucleotide (NAD+) and NAD hydride (NADH). The parametrization follows the methodology used in the development of the CHARMM22 all-hydrogen parameters fo…
The structural and electronic properties in common anion (GaSb)_1/(InSb)_1 and common cation (InAs)_1/(InSb)_1 [111] ordered superlattices have been determined using the local density total energy full potential linearized augmented plane wave method. The influence of the ordering direction, strain conditions and atom…
A preceding article referred to the processing of various grades of isotactic polypropylene (iPP) and propylene/ethylene copolymers by conventional and shear-controlled orientation injection molding (SCORIM), and considered the mechanical properties of the molded polymers in relation to the processing conditions appli…
1. Separation Properties 2. Industrial Applications 3. Trends in Polyimide Membrane Development 4. Relationship Between Structure and Polyimide Properties 5. Preparation Techniques 6. Conversion of Polyamic Acids into Polyimides
The first edition of this book was widely praised as an excellent introduction to electron microscopy for materials scientists, physicists, earth and biological scientists. This completely revised new edition contains expanded coverage of existing topics and much new material. The author presents the subject of electr…
Organophilic montmorillonite was obtained by the reaction of montmorillonite (MON) and distearyldimethylammonium chloride (DSAC). The modified clay and poly(l-lactide), (PLLA), were solvent-cast blended using chloroform as cosolvent. The structure and properties of the PLLA-clay blends were investigated. Thermal measu…
2-Chloro-1,3-dithiane was obtained by the chlorination of 1,3-dithiane with N-chlorosuccinimide. Reactions of 2-chloro-1,3-dithiane with various substituted phenols lead to 2-(1,3-dithianyl)phenols (3). Hexakis-[p-(1,3-dithian-2-yl)phenoxy]cyclotriphosphazene (6) was obtained by reaction with hexachlorotriazacyclotrip…
An analytical method to calculate eddy loss in a two-dimensional problem is presented. The problem geometry consists of a current carrying conductor of infinite length parallel to a conducting plate of infinite length and width but of finite thickness. The solution method first transforms the original current distribu…
The theory of phase stability in the Ni-Au alloy system is a popular topic due to the large size mismatch between Ni and Au, which makes the effects of atomic relaxation critical, and also the fact that Ni-Au exhibits a phase separation tendency at low temperatures, but measurements at high-temperature show an orderin…
Ce activated SrGa2S4 blue emitting phosphors were examined using electron paramagnetic resonance and x-ray diffraction to determine the local environment and oxidation state of the Ce ion. Photothermal deflection and photoluminescence spectroscopies were applied to determine absorption and emission characteristics. It…
We have investigated the high-temperature superionic transition of the anion-excess fluorite with x = 0.06 using both monochromatic and time-of-flight Laue single-crystal neutron diffraction. The measured Bragg intensities indicate that the cuboctahedral defect clusters found at ambient temperature start to break up i…
Million atom molecular-dynamics simulations are performed to investigate the structure, dynamics, and mechanical behavior of cluster-assembled ${\mathrm{Si}}_{3}{\mathrm{N}}_{4}$. These solids contain highly disordered interfacial regions with 50% undercoordinated atoms. Systems sintered at low pressures have percolat…
The order - disorder phase transition in the linear chain compound (TMMC) was investigated by means of x-ray diffraction. The hexagonal structure at room temperature (space group with Z = 2) is characterized by an orientational disorder of the organic group TMA. A weakly first-order phase transition occurs at 126 K wh…
The Raman spectrum of icosahedral \ensuremath{\alpha}-boron presents a very sharp peak at $525{\mathrm{cm}}^{\ensuremath{-}1}$ that was consistently rejected from the lattice modes but is still unexplained. New Raman scattering experiments under pressure are compared with ab initio lattice dynamics calculations. The v…
Picosecond dynamics of exciton emission and absorption have been studied in neat thin films of a variety of poly (phenylene vinylene) derivatives. We found that the stimulated emission band of 120 nm width and $\ensuremath{\sim}1\mathrm{ns}$ duration, which is observed at low exciton density $n$, collapses at $n>{1…
For both molecules and periodic solids, the ionic dynamical charge tensors which govern the infrared activity are known to obey a dynamical neutrality condition. This condition enforces their sum to vanish (over the whole finite system, or over the crystal cell, respectively). We extend this sum rule to the non trivia…
A generalization of the local density approximation (LDA) method for systems with strong Coulomb correlations is described which gives a correct description of the Mott insulators. The LDA+U method takes into account orbital dependence of the Coulomb and exchange interactions which is absent in the LDA. The scheme can…
The dynamic viscoelastic properties for binary blends consisting of an isotactic polypropylene (i-PP) and an ethylene-1-hexene copolymer (EHR) were investigated in both solid and molten states to reveal the relation between miscibility in the molten state and the morphology in the solid state. In this study, two types…
Using the Einstein relation for a grain boundary, the creep controlled by grain boundary diffusion is compared with that controlled by grain boundary viscous flow. It is found that the creep rate controlled by viscous flow has the same order as does that controlled by grain boundary diffusion. This suggests that the c…