Materials Literature
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We have made detailed comparison of the local and chain dynamics of a melt of 1,4-polybutadiene (PBD) as determined from experiment and molecular dynamics simulation at 353 K. The PBD was found to have a random microstructure consisting of 40% cis, 50% trans, and 10% 1,2-vinyl units with a number-average degree of pol…
A liquid-crystalline polymer of 6-[4-(4-ethylphenyl)diazenylphenyloxy]hexyl methacrylate and copolymer of the azobenzene monomer with 4‘-[6-(methacryloyloxy)hexyloxy]-4-cyanobiphenyl were cast as thin films. When the polymer films with cis -azobenzenes were subjected to irradiation with linearly polarized light at 436…
We used freeze trapping to stabilize the Michaelis complex of wild-type tryptophan synthase and the alpha-subunit substrate indole-3-glycerol phosphate (IGP) and determined its structure to 1. 8 A resolution. In addition, we determined the 1.4 A resolution structure of the complex with indole-3-propanole phosphate (IP…
A new experimental device is used to monitor in situ the swelling behavior of poly(dimethylsiloxane) melts in contact with supercritical carbon dioxide. The effects of pressure, temperature, and sample molecular weight on the kinetics and extent of swelling are examined using this experimental technique. The swelling…
Sonoluminescence (SL) spectra were collected from water doped with several organic liquids at low concentrations. Most of the organic substances studied show emission from C 2 and an overall decrease in the intensity relative to SL from pure water. This decrease is due to the consumption by the organic substrates of h…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTStereospecific Polymerization of 1,3-Butadiene with Samarocene-Based Catalysts 1Shojiro Kaita, Zhaomin Hou, and Yasuo WakatsukiView Author Information RIKEN (The Institute of Physical and Chemical Research), Hirosawa 2-1, Wako, Sait…
<italic>Sonochemistry</italic> starts off asking the questions: what is sonochemistry and why is it important? It has been recognised for many years that power ultrasound has great potential for uses in a wide variety of processes in the chemical and allied industries. Reported applications include cleaning, steriliza…
The results of fluorescence measurements of magnetic circular dichroism (MCD) in Mn L_2,L_3 X-ray emission and absorption for Heusler alloys NiMnSb and Co2MnSb are presented. Very intense resonance Mn L_3 emission is found at the Mn 2p_3/2 threshold and is attributed to a peculiarity of the threshold excitation in mat…
Mesoporous silica molecular sieve SBA-15 has been synthesized and incorporated with variable amounts of titanium via incipient-wetness impregnation with titanium isopropoxide in ethanol followed by calcination. Characterization by powder X-ray diffraction, nitrogen adsorption, X-ray photoelectron, Raman, and diffuse r…
This 1999 book covers all the most important areas of nanotube research, as well as discussing related structures such as carbon nanoparticles and 'inorganic fullerenes'. Carbon nanotubes are molecular-scale carbon fibres with structures related to those of the fullerenes. Since their discovery in 1991, they have capt…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTA Fast Thermally Curing Naphthyl−Ethynyl ImideMichael E. Wright and Derek A. SchorzmanView Author Information Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284-2006 Cite this: Macromolecules 1999, 3…
Synthesis and radical polyaddition behavior of N -methacryloyl- l -cysteine methyl ester (MA-C-M), N -4-pentenoyl- l -cysteine methyl ester (P-C-M), and N -4-vinylbenzoyl- l -cysteine methyl ester (V-C-M) were examined. Although MA-C-M afforded a cross-linked polymer and P-C-M did not polymerize at 60 °C, V-C-M polyme…
To critically compare with the fuzzy-cylinder-model theory for the dynamics of stiff-chain polymers in solution, zero-shear viscosities and mutual diffusion coefficients have been measured for dilute through concentrated isotropic solutions of poly( n -hexyl isocyanate) (PHIC) samples with the number N of Kuhn's stati…
The polyconjugated bithiophene−carbazole regular copolymer poly(3,6-bis(2-(3,4-ethylenedioxy)thienyl)- N -dodecylcarbazole), produced by anodic coupling of the relevant monomer in acetonitrile and characterized by cyclic voltammetry, FTIR reflection−absorption, and UV−vis spectroscopy, has been investigated with elect…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCondensative Chain Polymerization in Solid−Liquid Phase. Synthesis of Polyesters with a Defined Molecular Weight and a Narrow Molecular Weight Distribution by PolycondensationTsutomu Yokozawa and Hideto SuzukiView Author Information Department of Applied Chemistry Kana…
The [Cu 4 OCl 6 (IMIDH) 4 ] complex has been synthesized and its crystal structure and magnetic properties determined. The compound crystallizes as a dark green solid in the orthorhombic system, space group P 2 1 2 1 2 1, with cell constants a = 11.469(2) Å, b = 13.933(2) Å, c = 16.778(3) Å and four formula units per…
The electrometallurgical processing of spent fuel developed at Argonne National Laboratory produces a cathode which contains dendrites of heavy metal (principally U), salts, and residual cadmium. The cathode requires further treatment which is accomplished by loading it into a cathode processor to first purify and the…
We describe a detailed synthesis of a silicified inorganic/organic nanoporous monolithic composite conforming to the lyotropic liquid crystalline L 3 phase. The pore dimensions of the silicified L 3 phase scale with the solvent volume fraction in the synthesis reaction mixture. Changing the solvent fraction in the ini…
PFA sheets were modified with remote hydrogen plasma, and effects of the modification on the adhesion between copper layer and FEP were investigated. Remote hydrogen plasma treatment for a short time of 30 s is able to make the PFA surface hydrophilic. The remote hydrogen plasma treatment causes defluorination and oxi…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTSynthesis of Long Chain Branched Polypropylene with Relatively Well-Defined Molecular StructureBing Lu and T. C. ChungView Author Information Department of Materials Science and Engineering, The Pennsylvania State University, Univer…