Materials Literature
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Abstract Crosslinked cationic latexes based on polystyrene, poly[styrene‐ co ‐(methyl methacrylate)] and poly(methyl methacrylate) were prepared by an emulsion polymerization process using 2 mol‐% of a quaternary ammonium surfactant monomer. Phthalocyaninatocobalt(II)tetrasulfonate (CoPcTs) bound to these latexes were…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSoluble Polymer-Supported Catalysts Containing Pendant Quaternary Onium Salt Residues for Regioselective Addition Reaction of Epoxy Compound with Active EsterTadatomi Nishikubo, Atsushi Kameyama, Chika Maejima, Yuko Yamamoto, and Masao TomoiCite this: Macromolecules 1994, 27…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMiscibility, Microstructure, and Dynamics of Blends Containing Block Copolymer. 2. Microstructure of Blends of Homopolystyrene with Styrene-Butadiene Block CopolymersHanqiao Feng, Zhiliu Feng, and Lianfang ShenCite this: Macromolecules 1994, 27, 26, 7835–7839Publication Date…
When discussing diffusion processes of dopants at very high concentrations, i.e. , close to their solubility limit, it is absolutely necessary to take into account the fact that the number of substitutional sites accessible to additional donors/acceptors is decreasing or equal to zero when their concentration approach…
The diester was resynthesized to study its reported thermotropic biaxial nematic (Nb ) phase. A slightly different synthesis route using a monoprotected biphenol was used. All intermediates, as well as the final diester, were thoroughly characterized by high resolution NMR and in some cases elemental analysis to be ce…
Small-angle neutron scattering measurements of deformed single-crystal copper have been performed over a wavevector transfer range of 0.0655 ≤ Q ≤ 1.32 nm−1. The measurements included four samples deformed in compression at room temperature along the [110] direction to 6.8, 15.6, 35.0 and 54.3% reduction in thickness…
The contents of the HNO3- and EDTA-extractable micronutrients, Co, Cu, Mn and Mo, have been determined in 53 soil samples from nine Danish Spodosols and Ultisols. In most soils the contents decreased from surface to subsurface layers but increased at deeper depth. Correlation analysis showed close correlations between…
Radiation hardening and radiation-induced chromium (Cr) depletion were related to intergranular stress corrosion cracking (IGSCC) response among various stainless steels (SS). Available data on neutron-irradiated materials were analyzed and correlations developed between fluence, yield strength, grain-boundary Cr conc…
Polyimides used as orientation layer material for liquid-crystal displays (LCDs), significantly influence the resistivity of the liquid crystal (LC) layer. The correlation between the resistivity of the polyimide and the influence of the polyimide on the LC resistivity within LCDs was investigated. Via dielectric meas…
In this paper the succession of partial discharges at DC voltage is discussed. For the measurements presented here, the Townsend-like discharge mechanism was found to be dominant. Using a simple R C circuit, the discharge behaviour can be described. Several discharge parameters, such as the average time lag or the vol…
A high energy electron irradiation‐photoluminescence (PL) technique is employed for developing an analytical method for determining the concentration of carbon in silicon crystals. Particular attention is paid to the effect of oxygen concentration on the PL intensity. The intensity of the 0.790 eV PL peak (C‐line) due…
A model for the transport and reaction of BCI 3 and NH 3 for the deposition of BN on individual filaments in a fiber bundle at low pressures has been developed using previously published kinetic data. An operating diagram is presented which summarizes the results of the model and facilitates the choice of deposition p…
A previously developed formalism to interpret the beam broadening due to multiple small-angle scattering of a collimated beam of radiation in condensed matter is extended to treat the case of nonspherical scattering particles or pores. The new formalism concerns the situation where coherent single-particle scattering…
New liquid crystalline bicyclo[1.1.1]pentane derivatives have been prepared. Nematic and smectic A, B and C phases have been observed. When the bicyclo[1.1.1]pentyl unit is incorporated in a terminal alkyl chain, it acts as a chain stiffener without changing the transition temperature significantly. A bicyclo[1.1.1]pe…
BaCoS2 is orthorhombic Cmma a = 6.4413(3) Å, b = 6.4926(3) Å, c = 8.9406(3) Å, and is closely related to BaNiS2, which contains Ni-S layers separated by rock salt BaS sheets. Crystals were grown from the melt by slow cooling from 1050 to 950°C. The sulfur atoms in the Co-S layers have very anisotropic thermal displace…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure and Bonding of Bulk and Surface .theta.-Alumina from Periodic Hartree-Fock CalculationsA. P. Borosy, B. Silvi, M. Allavena, and P. NortierCite this: J. Phys. Chem. 1994, 98, 50, 13189–13194Publication Date (Print):December 1, 1994Publication History Published onlin…
Abstract We show at the example of noble gases, using the Lennard‐Jones potential to approximate the interactions between the atoms, that the global minimisation of the energy through variation of both the basis vectors of the simulation cell and the relative positions of the atoms within the cell leads to structures…
The arrangement of atoms in synchysite-(Ce) has been solved and refined to R = 0.036 using three-dimensional X-ray-diffraction data. In contrast to the putative hexagonal cell, weak X-ray-diffraction maxima on precession films demonstrate that synchysite-(Ce) is monoclinic, C2/c, a 12.329(2), b 7.110(1), c 18.741(2) A…
The surface defect structures on diamond (100) surfaces induced by 500 eV neon ion bombardment and by subsequent annealing were studied in situ with x-ray absorption near-edge structure (XANES) spectroscopy using 250–800 eV synchrotron radiation and with low energy electron diffraction. Ex situ x-ray photoemission spe…
Abstract Novel π-electron starburst molecules, 1,3,5-tris(phenyl-2-thienylamino)benzene (α-TPTAB) and 1,3,5-tris(phenyl-3-thienylamino)benzene (β-TPTAB), are found to form amorphous glasses with well-defined glass-transition temperatures of 38 and 46 °C, respectively, while 1,3,5-tris(diphenylamino)benzene instantly c…