Materials Literature
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Abstract A novel computational technique to generate close‐to‐equilibrium crosslinked polymeric systems is proposed. Compared to the current state‐of‐the‐art equilibration methods, the new technique appears to be faster by several orders of magnitude. The main advantage of the technique is that one can circumvent the…
The unexpectedly long time scale for development of melt adhesion strength in blown films of molecularly heterogeneous Ziegler−Natta ethylene copolymers previously led to speculation on the existence of a surface layer enriched in low molecular weight, highly branched fractions. In the present study the hypothesis was…
Spherical micron particles of crystalline titanium dioxide (TiO 2 ) were synthesized by in-flight oxidation of titanium carbide (TiC) micron powders (mean diameter: 28 μm) in argon−oxygen thermal plasma. The extent of oxidation of TiC powders increases with the flow rate of oxygen in the plasma gases (Ar + O 2 ), and…
Abstract The dumbbell‐like/egglike microspheres of poly(4‐vinylpyridine/ n ‐butyl acrylate)/polystyrene [P(4VP/nBA)/PS] were prepared by soap‐free seed emulsion polymerization. The effects of various polymerization parameters, such as the amount of ethyl acetate (EA) in the continuous phase, swelling time, degree of c…
Abstract In this study, polymethyl methacrylate (PMMA)‐coated talc was produced by the in situ polymerization of methyl methacrylate on the talc surface. The polymerization reaction was performed by both batch and semicontinuous emulsion processes. The polymerization kinetics, particle size and distribution, grafting…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTClathrate III of Group 14 Exists After AllSvilen Bobev and Slavi C. SevovView Author Information Department of Chemistry and Biochemistry University of Notre Dame, Notre Dame, Indiana 46556 Cite this: J. Am. Chem. Soc. 2001, 123, 14, 3389–3390Publication Date (Web):Mar…
Vanadium pentoxide (V 2 O 5 ) thin films have been produced by pulsed laser deposition. AFM, Raman, optical and electrical measurements have been made on the films in order to understand the growth mechanism of laser ablated V 2 O 5 thin films. The investigations revealed the growth of stoichiometric and high-quality…
Abstract A soluble polyimide prepared from 7,7′‐bis(4‐aminophenoxy)‐4,4,4′,4′‐tetramethyl‐2,2′‐spirobichroman and 4,4′‐hexafluoroisopropylidenediphthalic anhydride was mixed with organo‐modified montmorillonite or synthetic mica in N,N ‐dimethylacetamide. The content of the clay minerals was 1, 2, and 4 wt %, respecti…
We use molecular dynamics to study the ordering of a nematic liquid crystal around a spherical particle or droplet. Homeotropic boundary conditions and strong anchoring create a hedgehog (radial point defect) director configuration on the particle surface and in its vicinity; this topological defect is canceled by nea…
Abstract The mechanical behavior of semicrystalline Nylon 11 was studied at strain rates between 10 −3 and 8800 s −1 . X‐ray diffraction and DSC were employed to examine the crystal structure and the crystallinity content. The as‐received material comprised a mixed structure of a predominately triclinic (α) form. DSC…
We present a study on the origin of twinning and antiphase domains and their relationship to charge ordering in ${\mathrm{La}}_{0.33}{\mathrm{Ca}}_{0.67}{\mathrm{MnO}}_{3}.$ The evolution of these orientational and charge-ordered domains is attributed to the reduction of the crystal symmetry due to the cubic to orthor…
Antifoam substances are used in various technologies and commercial products to prevent the formation of undesirable foam. A typical problem in their application is that an antifoam that is rather active in a given surfactant solution might be very inefficient for other foaming media at comparable conditions. The reas…
The solvothermal synthesis of the layered compound Mn 2 Sb 2 S 5 ·DAP (DAP = 1,3-diaminopropane) has been studied using in situ energy-dispersive X-ray diffraction. The results clearly demonstrate that the induction time strongly depends on the reaction temperature. At lower temperatures two crystalline intermediates…
A mixed quantum mechanics/molecular mechanics (QM/MM) model is used for investigating the nature of hydrogen adsorption in single-walled carbon nanotubes (SWNTs). For the QM part the B3LYP functional was used while for the MM we employ the universal force field (UFF). Our model includes up to 64 carbon and 32 hydrogen…
Abstract Adriamycin (ADR) was selected as a model drug to evaluate the potential applications of polylactide/poly(ethylene glycol)/polylactide (PLA/PEG/PLA) micelles as drug carriers in parenteral delivery systems. The PLA/PEG/PLA triblock copolymer micelles were characterized by dynamic light scattering and transmiss…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTQ-CdS Photoluminescence Activation on Zn2+ and Cd2+ Salt IntroductionDale E. Moore and Kaushik PatelView Author Information Department of Chemistry, Mercer University, Macon, Georgia 31207 Cite this: Langmuir 2001, 17, 8, 2541–2544Publication Date (Web):March 20, 2001Publicatio…
Using small-angle neutron scattering and liquid integral equation theory, we relate the structure factor of flexible dendrimers of fourth generation to their average shape. The shape is measured as a radial density profile of monomers belonging to a single dendrimer. From that, we derive an effective interaction of Ga…
Ag(CN) 2 - is reduced at a low rate by radiolytically generated hydroxymethyl radicals. The reduction occurs on tiny nuclei in solution formed by hydrolysis. When colloidal silver seed particles are present in the solution, the reduction of Ag(CN) 2 - is much faster, and larger silver particles with a narrow size dist…
Abstract Ultraviolet (UV) weathering performance of unpigmented and rutile titanium dioxide pigmented rigid polyvinyl chloride (PVC)/wood‐fiber composites has been studied. The composite samples were manufactured by dry‐blending PVC, wood fibers, and other processing additives in a high‐intensity mixer. The dry‐blende…
A generic finite-element based approach for predicting the behavior and properties of multiphase materials comprised of anisotropic, arbitrarily shaped and oriented phases is presented. The approach is exact in principle and effective in practice. It is the consistent use of periodic boundary conditions in the course…