Materials Literature
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An analysis of the morphological behavior of substrate-supported diblock copolymer films for thicknesses t below the equilibrium period L 0 of the copolymer is presented. Substrate-supported films generally exhibit dissimilar interactions between the copolymer block components and the free and substrate surfaces. Acco…
Micropatterned thin films have received increased interest in the past few years. Besides preparation by conventional lithography, self-assembly of materials around a template can be used for patterning. Recently a method that utilizes the condensation of micrometer-size water droplets on solutions of block copolymers…
Gelatin samples, native and chemically crosslinked with three different diisocyanates, were studied by bending-creep measurements. These samples were characterized by the number-average molecular weight of a chain segment between two points of crosslinkage Mc. The chemical network was found to contribute to a marked e…
Different modified polyamide (MPA) and modified polyethylene (MPE) resins were prepared by reactive extrusion of different contents of a compatibilizer precursor (CP) with either polyamide (PA) or polyethylene (PE). The MPE and MPA resins were then blow-molded with designed amounts of PA or PE resins to prepare four d…
The first layered vanadium borophosphate (imidazolium)3.8(H3O)1.2[(VO)4(BO)2(PO4)5].0.3H2O (1) has been synthesized hydrothermally and characterized by chemical analysis, infrared and Raman spectroscopy, and thermogravimetric and magnetic measurements. The compound crystallizes in the monoclinic space group C2/c, a =…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEffect of Macromolecular Isomerism on the Photomodulation of Dendrimer PropertiesSheng Li and Dominic V. McGrathView Author Information Department of Chemistry, University of Arizona Tucson, Arizona 85721 Cite this: J. Am. Chem. Soc. 2000, 122, 28, 6795–6796Publication…
The effect of electron beam irradiation on the properties of carbon black-, silica-, and clay-filled fluorocarbon rubber has been studied over a range of radiation doses, loadings, and nature of the fillers. Compared to the unfilled irradiated rubber, the tensile strength and modulus improve with a decrease in the par…
Viscoelastic models were employed to analyze the stress–strain behavior of cotton, acrylic, and polyester yarns. The potential model and the modified Maxwell model gave the best fits as regards the stress–strain behavior of these yarns. The results of the potential model resembled those of the modified Maxwell model w…
Functionalized hyperbranched poly(siloxysilane)s have been prepared by hydrosilylation reactions involving the multiple silicon hydride (SiH) groups of the polymer to introduce other reactive groups such as epoxy, amine, and hydroxyl groups. The possible use of these modified polymers as novel crosslinking agents is d…
To study the Nd:YAG laser ablation of graphite−Co/Ni (1.2 at. %) and the growth of single-wall carbon nanotubes (SWNTs) in an Ar atmosphere at 1200 °C, we applied time-resolved imaging and spectroscopic techniques. These techniques are based on measuring the laser plume emission and light scattering of growing materia…
A new type of giant-wheel-shaped anion (see title) is obtained during the formation of the “classical” tetradecameric molybdenum-blue-type species [{Mo2}{Mo8}{Mo1}]14 in the presence of Pr3+. The Pr3+ cations substitute {Mo2} units and thereby increase the curvature of each ring, which leads to destruction and smaller…
Nonlithographic techniques for patterning structures on the nanometer scale can provide methods for direct control of particle spacing at surfaces. By using diblock copolymers, the surface density of a film can be established by the properties and area of the anchoring block, and the feature sizes can be set through t…
The self-assembly of dinuclear triple helical lanthanide ion complexes (helicates), in aqueous solution, is investigated utilizing laser-induced, lanthanide luminescence spectroscopy. A series of dinuclear lanthanide (III) helicates (Ln(III)) based on 2,6-pyridinedicarboxylic acid (dipicolinic acid, dpa) coordinating…
We use scanning force microscopy and stepwise erosion in a radio-frequency (rf) plasma to obtain a three-dimensional volume image of an ultrathin poly(styrene- b -butadiene- b -styrene) triblock copolymer film. The free surface of the film exhibits domains of two distinctly different structures, i.e., hexagonal arrays…
The compatibilizing effect of poly(hexamethylene oxide) (PHMO) on the synthesis of polyurethanes based on α,ω-bis(6-hydroxyethoxypropyl) poly(dimethylsiloxane) (PDMS) was investigated. The hard segments of the polyurethanes were based on 4,4′-methylenediphenyl diisocyanate (MDI) and 1,4-butanediol. The effects of the…
The prospect of developing magnetic qubits is discussed. The first part of the article makes suggestions on how to achieve the coherent quantum superposition of spin states in small ferromagnetic clusters, weakly uncompensated antiferromagnetic clusters, and magnetic molecules. The second part of the article deals wit…
Room-temperature pulsed plasma polymerization of long-chain perfluoroacrylates produces well-adhered liquid-repellent (hydrophobic and oleophobic) films. Critical surface tension values as low as γ c = 4.3 mN m - 1 have been measured on coated flat glass substrates. X-ray photoelectron spectroscopy, Fourier transform…
Octakis(3-hydroxypropyldimethylsiloxy)octasilsesquioxane (OHPS) can be synthesized by direct hydrosilylation of allyl alcohol with octakis(dimethylsiloxy)octasilsesquioxane, (HSiMe 2 O)Si 8 O 12 (Q 8 M 8 H ), using platinum divinyltetramethyldisiloxane [Pt(dvs)] as catalyst. Surprisingly, C-hydrosilylation occurs in p…
The ultrastructure and morphology of potato (Solanum tuberosum L.) tuber cells were investigated by optical, scanning, and transmission electron microscopies. After removal of starch granules, pectins and hemicelluloses were solubilized under alkaline conditions. The alkaline insoluble residue consisted mainly of prim…
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