Materials Literature
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Abstract In packaging applications, blocking is always found in low‐density polyethylene (LDPE) films. Practically, such problems can be solved by incorporation of antiblocking agents, for example, silica and talc. The objective of this research was to explore the possibility of using silica from rice husk ash (RHA si…
Abstract Methacrylic acid (MAA) and methyl methacrylate (MMA) were used as additives for peroxide‐cured styrene–butadiene rubber (SBR) filled with three inorganic fillers with different particle sizes and surface activity, for example, MgO, Mg(OH) 2 , and BaSO 4 . The experimental results show that the introduction of…
Abstract Biopitch is a renewable source of polyol obtained from Eucalyptus tar distillation, which was studied as an active component of polyurethane (PU). The polymerization occurred in one step, with a mixture of biopitch and hydroxyl‐terminated polybutadiene polyols reacted with 4‐4′‐diphenyl methane diisocyanate i…
Passive metals are protected from the environment by a thin (3--5 nm) oxide film that forms on their surface. The corrosion rate of these materials is typically of the order of $0.1\ensuremath{\mu}\mathrm{m}/\mathrm{y}\mathrm{e}\mathrm{a}\mathrm{r},$ and depends on the electronic structure of the oxide layer. Here we…
Microfluidic systems have become important platforms for diagnostic and therapeutic applications. However, as channel dimensions decrease within these systems, the surface properties of these microchannels become increasingly important. When biological fluids are flowed through such channels, nonspecific protein adsor…
A novel type of redox-active materials, which to our knowledge are the first examples of mesoporous silica hosts containing dendritic guest molecules within their highly ordered channels, is presented. A simple and efficient synthetic route has been used to incorporate poly(propyleneimine) dendrimers containing 4, 8,…
Abstract The effect of shear‐controlled orientation injection molding (SCORIM) was investigated for polybutene‐1/polypropylene blends. This article reports on the methods and processing conditions used for blending and injection molding. The properties of SCORIM moldings are compared with those of conventional molding…
Abstract Polypropylene (PP) was melt‐blended in a single‐screw extruder with a thermotropic Vectra B‐950 liquid crystalline polymer (LCP) in different proportions. The mechanical properties of such blends were compared in respect of their Young's moduli, ultimate tensile strength (UTS), percent elongation at break, an…
Abstract The biodegradation of a coextruded starch/poly(lactic acid) polymeric material was studied in a liquid, in an inert solid, and in composting media. Mineralization of the material's carbon content was followed using the appropriate ASTM standard experimental methods. The final percentage of biodegradation depe…
Abstract The effect of SCORIM was investigated on three grades of polybutene‐1 and one grade of ethylene–butene‐1 copolymer. The methods and processing conditions used for injection molding and the properties of the moldings are reported. Phase transformations and their relationship with mechanical properties are disc…
The title polyanion is the first hybrid borophosphate-phenylphosphonate polyoxometalate. It was structurally characterized as its imidazolium salt, (C(3)N(2)H(5))(5)[Mo(12)O(30)(BPO(4))(2)(O(3)P-Ph)(6)].H(2)O (monoclinic, P2(1)/c, a = 22.120(3) A, b = 13.042(2) A, and c = 32.632(4) A, beta = 101.293(3) degrees ), whic…
Abstract A stereoregular poly(phenylacetylene) bearing the bulky aza‐18‐ crown ‐6 ether as the pendant (poly‐ 1 ) formed a predominantly one‐handed helical conformation upon complexation with various chiral compounds, such as amino acids, peptides, aminosugars, amines, and amino alcohols in water. The complexes exhibi…
Energy-dispersive x-ray diffraction (EDXRD) with synchrotron light can be used for in situ -structural analysis during polycrystalline thin-film growth, due to its fast data collection and the fixed diffraction angle. An in situ deposition and analysis set-up for the investigation of nucleation and growth of thin film…
Octahedral complexes of the type [M(tren)(LIBQ)]n+ or [M(tren)(LISQ)]n+ (tren = tris(2-aminoethyl)amine; LIBQ = o-iminobenzoquinone, (LISQ)1− = o-iminobenzosemiquinonate(1−) π radical, M = Ni, Co, Fe) have been prepared by the reaction of equimolar amounts of 2-anilino-4,6-di-tert-butylphenol, tris(2-aminoethyl)amine,…
Abstract A new model for the description of incoherent peaks observed in energy‐dispersive x‐ray fluorescence spectra is proposed. The model was derived after a systematic study of peak shapes based on Monte Carlo simulations. The model consists of a Gaussian modified by two exponential tail functions. The model is im…
We report velocity dependencies of dynamic contact angles for CCl 4 and tert -butyl alcohol on the amorphous fluoropolymer AF 1600 and compare them with our previous results for octamethylcyclotetrasiloxane (OMCTS) on the same substrate. The molecules of these liquids have well-defined form and the solid surface is al…
The phonon dispersion of single-walled boron nitride nanotubes is calculated within a valence shell model of the lattice dynamics. The model parameters are derived from fittings to the measured phonon dispersion of hexagonal boron nitride and available optical data. The calculated phonon dispersion curves for the tube…
Cyclic vinylogous tetrathiafulvalenes (TTFs) where the two dithiole rings are linked through the outer sulfur atoms with an alkyl chain of various lengths were synthesized by oxidative intramolecular coupling of bis(dithiafulvenes). Upon oxidation, these systems exhibit large molecular movements associated with electr…
We have produced, by thermal decomposition of an organometallic complex in a bulk film of P(S- b -2VP), nonagglomerated cobalt nanoparticles that exhibit significant room-temperature magnetic coercivity. The particles are patterned on the nanoscale: they reside within the P2VP domains of the block copolymer morphology…
A single strand of spider silk with a diameter of ∼5 µm and ∼3 cm in length was used as a template to dip-coat a liquid crystalline silica–surfactant mesophase along the direction of the silk strand to obtain a hierarchically ordered hollow mesoporous silica fiber (external diameter of 1–2 µm) after removal of the spi…