Materials Literature
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Different poly(ammonium) salts with various chemical structures were self-assembled by the layer-by-layer method with a synthetic hectorite, Laponite. Using X-ray reflectometry, we show that internal order is present in all multilayers. The structure of the polycation slightly modulates the spatial extent of order in…
Potentiometric titrations of the mixtures of lanthanide(III) perchlorates and bis-Tris propane (BTP) reveal formation of dinuclear hydroxo complexes M2(BTP)2(OH)n(6-n), where M = La(III), Pr(III), Nd(III), Eu(III), Gd(III), and Dy(III) and n = 2, 4, 5, or 6, in the pH range 7-9. ESI-MS data confirm the presence of din…
Compounds [Mn(dca)2bipym] (1), [Cu2(dca)4bipym] (2), and [Mn2(dca)4bipym] (3) have been synthesized and structural (2, 3) and magnetically characterized. Compound 1 is isomorphous with [Mn(dca)2bipy]. Compound 2 crystallizes in the monoclinic P2(1)/c space group, Z = 4, with a = 7.5609(9), b = 11.477(42), and c = 11.7…
Abstract The rigid amorphous phase, the low temperature melting endotherm, and their development with thermal treatment in poly(ethylene terephthalate) (PET) were investigated by means of modulated differential scanning calorimetry. The differential of the reversing heat capacity and nonreversing heat flow signals wer…
Changes of crystallinity and unit cell parameters for a low-density polyethylene as a consequence of cross-linking by dicumyl peroxide and by electron beam irradiations are compared. Polyethylene samples cross-linked by irradiation in the solid state present variations essentially only of the a unit cell parameter whi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTAdsorption of Nanocolloidal SiO2 Particles on PEO BrushesR. A. Gage, E. P. K. Currie, and M. A. Cohen StuartView Author Information Laboratory of Physical and Colloidal Chemistry, Wageningen University, Dreijenplein 6, 6703 HB Wagen…
Heat capacities of the spin crossover complex [Fe(2-pic)3]Cl(2)*MeOH (2-pic: 2-picolylamine or 2-aminomethylpyridine) were measured with an adiabatic calorimeter between 12 and 355 K. A broad heat capacity peak, starting from approximately 80 K, culminating at approximately 150 K, and terminating at approximately 250…
Abstract A series of poly(ester amide)s were synthesized by solution polycondensations of various combinations of p ‐toluenesulfonic acid salts of O,O′ ‐bis(α‐aminoacyl)‐1,4:3,6‐dianhydro‐ D ‐glucitol and bis (p ‐nitrophenyl) esters of aliphatic dicarboxylic acids with the methylene chain lengths of 4–10. The p ‐tolue…
Abstract Maleated natural rubber (MNR) was prepared and used as a blending composition and a compatibilizer for blending of natural rubber (STR 5L) and cassava starch. The melt rheological behavior in terms of Mooney viscosity, apparent shear stress, and shear viscosity at 100°C were quantified. We found that the pure…
This paper highlights the significant changes introduced with the F-revision of MIL-STD-810, "Test Method Standard for Environmental Engineering Considerations and Laboratory Tests." The major emphasis on test tailoring presented in Part One of the document is described. Significant features of each test method in Par…
The binary blend compatibility of polyamide 6 (PA6) with poly(vinyl alcohol) (PVOH), poly(vinyl acetate) (PVAC), and partially hydrolyzed PVAC was studied for a wide range of compositions, by atomistic and mesoscopic modeling. The Flory−Huggins interaction parameter χ, calculated for these mixtures by atomistic modeli…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTTuning of Superquenching in Layered and Mixed Fluorescent PolyelectrolytesRobert M. Jones, Troy S. Bergstedt, Duncan W. McBranch, and David G. WhittenView Author Information QTL Biosystems, LLC, 2778 Agua Fria Street Santa Fe, New Mexico 87501 Cite this: J. Am. Chem. S…
Recent experiments by Ryu, Hermel, and co-workers have demonstrated a correlation between the presence of bridging A-blocks and practical toughness in themoplastic ABABA pentablock copolymers. Building on this observation, we develop a computational tool for evaluating average bridging fractions of internal blocks in…
Polymer blends of poly(vinylphenol) (PVPh) with poly(vinylpyrrolidone) (PVP) were prepared by solution casting from the N, N -dimethylformamide (DMF) solution. Differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), and solid-state nuclear magnetic resonance (NMR) were used to investig…
The paper describes a new method of copolymerization of glycolide with l -lactide with the use of a low toxic compound Zr(acac) 4 as initiator at a temperature of 100 up to 150 °C. Copolymerization at 150 °C is very fast and reached nearly 100% yield. The values of the copolymerization coefficients were estimated as r…
We present a mesoscopic picture of supercooled water in which we fit the properties of water into a general scheme applicable to all so-called fragile glass-forming liquids. Water is taken as a single liquid phase above its glass transition at about 136 K. It is the only liquid known to have a Kauzmann temperature tha…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTADDITION / CORRECTIONThis article has been corrected. View the notice.First Divergent Strategy Using Two AB2 Unprotected Monomers for the Rapid Synthesis of DendrimersLaurent Brauge, Germinal Magro, Anne-Marie Caminade, and Jean-Pierre MajoralView Author Information La…
Materials with high electrical conductivity and optical transparency are needed for future flat panel display, solar energy, and other opto-electronic technologies. In(x)Cd(1-x)O films having a simple cubic microstructure have been grown on amorphous glass substrates by a straightforward chemical vapor deposition proc…
The alpha process (segmental motion) of thin polystyrene films supported on glass substrate has been investigated in a wider frequency range from 10(-3) Hz to 10(4) Hz using dielectric relaxation spectroscopy and thermal expansion spectroscopy. The relaxation rate of the alpha process increases with decreasing film th…
We report bcc-like crystal structures in 2-4 ML Fe films grown on fcc Cu(100) using scanning tunneling microscopy. The local bcc structure provides a straightforward explanation for their frequently reported outstanding magnetic properties, i.e., ferromagnetic ordering in all layers with a Curie temperature above 300…