Materials Literature
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Helical polyacetylene was synthesized under an asymmetric reaction field consisting of chiral nematic (N*) liquid crystals (LCs). The chiral nematic LC was prepared by adding a chiroptical binaphthol derivative as a chiral dopant to a mixture of two nematic LCs. Acetylene polymerizations were carried out using the cat…
Self-assembly of block copolymers is attractive for nanodevice fabrication because the association of different polymers by covalent bonding and the interplay between the sequences allows one to generate a variety of structures with well-defined shapes. We present a straightforward approach to generate self-organized…
Measurements are reported of small-angle neutron scattering (SANS) from lightly cross-linked poly(vinyl acetate) gels swollen in good and ϑ solvents. In all the solvent conditions investigated the scattering response can be described satisfactorily by two characteristic length scales: a thermodynamic correlation lengt…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTQuantifying the "Neutrality" of Good Solvents for Block Copolymers: Poly(styrene-b-isoprene) in Toluene, Benzene, and THFChing-i Huang, Bryan R. Chapman, Timothy P. Lodge, and Nitash P. BalsaraView Author Information Department of Chemical Engineering & Materials Science and De…
Magnetic exchange interactions have been calculated in the framework of the density functional (DF) theory for the quite rare exchange coupled binuclear compounds in which the magnetic centers belong to the 4d series: [{Mo V (O)(Tp*)Cl} 2 (μ-X)], (where X is one of the dihydroxybenzene bridging ligands [1,4-OC 6 H 4 O…
The importance of crystal growth rate in the morphological formation of strongly interacting crystalline/amorphous polymer blends has been assessed by considering polycaprolactone (PCL)/poly(4-vinylphenol) (PVPh) systems. The effects of composition and molecular weight (MW) on the morphological structure were investig…
Abstract Direct methods are, at present, applied to a large variety of cases: X-ray, neutron or electron data; single crystal and powder data; small molecules and macromolecules. While direct methods solved in practice the phase problem for small molecules, their application to macromolecules is recent and still under…
Here we present a method for synthesizing permanently linked monodisperse paramagnetic chains by both covalently linking surface-functionalized polystyrene particles and physically linking electrostatically stabilized paramagnetic emulsion droplets. We observe the stability, field alignment, and flexibility of this ne…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPeroxo-, Oxo-, and Hydroxo-Bridged Dicopper Complexes: Observation of Exogenous Hydrocarbon Substrate OxidationHonorio V. Obias, Yin Lin, N. N. Murthy, Elna Pidcock, Edward I. Solomon, Martina Ralle, Ninian J. Blackburn, Yorck-Michael Neuhold, Andreas D. Zuberbühler, a…
Biodegradable polymers based on star-shaped poly(ethylene oxide) (PEO)−poly( l -lactide) (PLA) and PEO−poly(ε-caprolactone) (PCL) block copolymers were synthesized by a divergent synthetic method. Multiarm PEOs with various numbers of arms with a fixed molecular weight (MW ∼ 10 000) were synthesized by anionic polymer…
In this paper we report the observation of curent induced change of resistance of thin metallic oxide films. The resistance changes at a very low current (current density $J \geq 10^{3}$ A/cm$^{2}$). We find that the time dependence associated with the processes (increase of resistance) show a streched exponential typ…
Novel boron(III) subphthalocyanines (SubPcs) soluble in organic solvents containing a variety of donor and acceptor substituent groups have been synthesized by boron trihalide-induced cyclotrimerization of adequately substituted derivatives of phthalonitrile in 1-chloronaphthalene. The choice of the substituents on th…
Using neutron reflectometry we have resolved to high resolution the internal structure of self-assembled polyelectrolyte multilayer films and have developed a detailed molecular picture of such systems by analyzing the data with a composition-space refinement technique. We show that such surface films consist of strat…
Chemistry of polythiophenes, R. McCullough electronic properties of polythiophenes S. Hotta chemistry of oligothiophenes, P. Beuerle oligothiophene thin films and crystals, D. Fichou transport phenomena in semiconducting oligothiophenes, G. Horowitz theoretical models of oligo- and polythiophenes, J.-L. Bredas nonline…
Abstract This comprehensive and systematic text is the first of its kind to deal with the fundamental physics underlying the remarkable structural and dynamical properties of block copolymers. It provides the polymer scientist and technologist with a firm grounding in the principles underlying the wide applications of…
A variety of trinuclear complexes [M(3)(H(-)(3)L)(2)](3+) [M = Y, La, Eu, Gd, Dy; L = 1,3,5-triamino-1,3,5-trideoxy-cis-inositol (taci) and 1,3,5-trideoxy-1,3,5-tris(dimethylamino)-cis-inositol (tdci)] was prepared as solid materials of the composition M(3)(H(-)(3)L)(2)X(3).pH(2)O.qEtOH (X = Cl, NO(3); 2.5 </= p </= 9…
Dielectric spectroscopy in the frequency range from 10 -2 to 10 6 Hz and in the temperature range from 190 to 430 K is employed to analyze the temperature dependence of the relaxation rates of the α and δ relaxation of liquid-crystalline polymethacrylates having derivatives of ( p -alkoxyphenyl)benzoate as mesogenic u…
The relationship between coverage of hydrophobic groups on modified glass bead surfaces and macroscopic properties such as wettability or dispersion ability has been demonstrated. The glass bead surfaces modified by trimethylsilyl (TMS) groups were obtained by the chemical reaction between trimethylchlorosilane molecu…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Aqueous Solution Characterization of Catalytically Active Block Copolymers Containing ImidazoleMartin R. Simmons and Costas S. PatrickiosView Author Information Department of Chemical Engineering, University of Manchester Institute of Science and Technology (UMIST…
Poly(vinylidene flouride) (PVF 2 ) gels in diethyl adipate (DEA) with fibrillar morphology. The gels are transparent. The Wide-angle X-ray scattering pattern and FT-IR spectra of the gel indicate the presence of solvated α-phase PVF 2 crystallites in the gel. The intensities of the X-ray diffraction peaks of the gel a…