Materials Literature
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The dielectric loss spectra of poly(ethylene 2,6-naphthylene dicarboxylate) (PEN) and several copolymers of 2,6-naphthylene dicarboxylic acid and terephthalic acid with ethylene glycol have been studied over a wide range of frequency and temperature. Previously, Ezquerra, Balta-Calleja, and Zachmann have reported the…
We present static light scattering results for Laponite suspensions. Analyzing our data using the Zimm technique, we measure a second virial coefficient of 6.0 × 10 - 23 m 3 at an ionic strength of 10 - 4 M. Both results agree well with recent theories and computations for the thermodynamics of hard disks. Our data su…
Various hyperbranched polymers with alternating ureido and urethano units in their backbones were synthesized by direct polycondensation of diisocyanates (A 2 -type monomers) with compounds containing one amino group and multihydroxyl groups (CB n -type monomers). Because of the commercial availability of the monomers…
An attractive way to advance the design and prediction of new compositions and structures of solid-state compounds is to identify large homologies that are amenable to chemical control. Homologies allow the systematization of phases under a common conceptual umbrella and have the potential to capture the vast majority…
Electrospinning is a simple technique to create nanometer‐scale polymer fibers by application of a large static voltage to a viscous polymer solution, or spin‐dope. At polymer concentrations higher than the critical concentration, above which polymer entanglement can occur, it was found polymer fibers could be electro…
We synthesized dimesogenic liquid crystals with both cholesterol and azobenzene groups by esterification of 10,12-docosadiynedioic acid or docosanedioic acid with 4-alkyl-4‘-hydroxyazobenzene (or 4-hydroxyazobenzene) and cholesterol and studied the thermal, optical, and glass-forming properties. Especially, we focused…
Natural fibers are potentially a high‐performance non‐abrasive reinforcing fiber source. In this study, pulp fibers [including bleached Kraft pulp (BKP) and thermomechanical pulp (TMP)], hemp, flax, and wood flour were used for reinforcing in polypropylene (PP) composite. The results show that pulp fibers, in particul…
The electronic properties of carbon nanotubes (NTs) in a uniform transverse field are investigated within a single orbital tight-binding (TB) model. For doped nanotubes, the dielectric function is found to depend not only on symmetry of the tube, but also on radius and Fermi level position. Band gap opening/closing is…
Adsorbed proteins on implanted biomedical devices mediate platelet and leukocyte adhesion. Radio frequency plasma deposited tetraglyme (CH 3 O(CH 2 CH 2 O) 4 CH 3 ), which forms a PEO-like coating, has been shown to resist protein adsorption and monocyte adhesion in vitro. By using different plasma deposition powers (…
Magnesium, as a lightweight construction material, has rapidly grown its applications in the automotive industry since the early 1990s. To maximize the weight reduction of vehicles by lightweight magnesium alloys in the coming years, the use of newly developed high-temperature magnesium alloys is expected to increase…
Of all the hydrocolloids in use today, surely none has proven as popular with the general public and found favor in as wide a range of food products as gelatin. A sparkling, clear dessert jelly has become the archetypal gel and the clean melt‐in‐the‐mouth texture is a characteristic that has yet to be duplicated by an…
The Stokes emission of nanocrystalline and bulk Y 2 O 3:Er 3+, Yb 3+ following 488 nm were reported. Two nanocrystalline samples were studied, one produced via propellant synthesis and the other via wet synthesis. Green, red, and NIR emission from the Er 3+ ion was observed in both bulk and nanocrystalline samples. Em…
A novel heterospin complex containing both macrocyclic and imino nitroxide radical ligands: {[CuL(H2O)](CuL)Mn(IM-2Py)}{[CuL(MeOH)](CuL)Mn(IM-2Py)}(ClO4)4·MeOH, has been synthesized and its crystal structure determined by X-ray diffraction methods. In order to interpret the exchange interaction of this asymmetric hete…
Abstract A styrene–butadiene–styrene triblock copolymer (SBS) was functionalized with glycidyl methacrylate (GMA). Grafting reactions were carried out in an internal mixer at 170°C, using dicumyl peroxide (DCP) as an initiator. The effect of three variables, % GMA, % DCP, and reaction time, on grafting were studied us…
A series of novel chlorosilyl functional initiators have been prepared and applied for the first time in the living cationic polymerization of isobutylene (IB). Well‐defined polyisobutylenes (PIBs) carrying mono‐, di‐, and tri‐chlorosilyl head‐group, and a tert‐chloro end‐group were synthesized using newly designed si…
A novel organic–inorganic hybrid compound [Cu(phen)]2[VIVV4VAs2VO19]·0.5H2O 1 has been hydrothermally synthesized. Its structure, determined by single crystal X-ray diffraction, exhibits an unusual two-dimensional arsenic vanadate layered network grafted with the [Cu(phen)]2+ complex. The chelating phen ligands projec…
Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron spins and local spins is simplified to the Ising-type one. The transport quantities such as the electronic resistivity, t…
The elastic properties of planar, C4-symmetric networks under stress and at nonzero temperature are determined by simulation and mean field approximations. Attached at fourfold coordinated junction vertices, the networks are self-avoiding in that their elements (or bonds) may not intersect each other. Two different mo…
Granular γ-Al 2 O 3 support and 8 wt % CuO/γ-Al 2 O 3 catalyst were synthesized by a sol−gel granulation method. The pore structure, crush strength, hardness, and elasticity of these sol−gel-derived catalysts were studied and compared with similar commercial catalysts prepared by non-sol−gel methods. Alumina and CuO-c…
Abstract The synthesis was performed by the electropolymerization of thiophene on a poly(dimethylsiloxane) (PDMS)‐coated platinum electrode at 2.2 V with tetrabutylammoniumtetrafloroborate (TBAFB) as a supporting electrolyte and with acetonitrile as a solvent. The characterization of the PDMS–polythiophene (Pth) compo…