Materials Literature
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The polyethylene for the study was ultra-high molecular weight polyethylene (UHMW-PE) reactor powder extrusion drawn to a low draw ratio (DR) of ∼6 (first-stage draw). The structural change during the second-stage tensile draw of the extrudate has been studied above the static melting point by real-time wide-angle X-r…
The influence of a poly(styrene- graft -ethylene oxide) (P(S- g -EO)) copolymer on poly(2,6-dimethyl- p -phenylene oxide)/poly(methyl methacrylate) (PPO/PMMA) blends was studied by a number of different techniques in order to characterize the properties of the interphase. Scanning electron microscopy shows that the co…
The potentially toxic diatom Pseudonitzschia pungens f. multiseries was grown on different sources of nitrogen in batch cultures. Ammonium did not support growth at concentrations >200 μM, and even lowered the growth rate, when it was supplied in addition to growth-saturating nitrate concentrations. This seemed to be…
A microkinetic model was developed to explain the catalysis of the water−gas shift reaction by sulfided, alumina-supported molybdenum. In this model, the reaction takes place through a regenerative (reduction−oxidation) scheme wherein the catalyst surface is alternately oxidized by water and then reduced by carbon mon…
We have studied a double-bond bridged porphyrin dimer, trans -1,2-bis( meso -octaethylporphyrinyl)ethene (tbis OEP), which in solutions exhibits new spectral properties: (i) pronounced absorption bands in addition to the monomer ones are observed in the 480−500 and 600−900 nm regions; (ii) a broad-band fluorescence wi…
Within the extended-Hückel theory we present the influence of carbon 3s orbitals on the band structure of diamond. 3s orbitals are shown to account for the indirect band gap. The results of EHMO-ASED (atom superposition and electron delocalization) calculations agree well with orthogonalized plane-wave (OPW), pseudopo…
Article The Diatom Genus Thalassiosira (Bacillariophyta) in the Estuaries of the Schelde (Belgium/The Netherlands) and the Elbe (Germany) was published on January 1, 1996 in the journal Botanica Marina (volume 39, issue 1-6).
We investigated the isothermal crystallization of poly(ethylene terephthalate) by time-resolved small-angle X-ray scattering (SAXS) using synchrotron radiation. At the early stage, the SAXS intensity decreased monotonously with scattering angle (stage I). Then the SAXS profile showed a peak and the peak position progr…
Diffuse reflectance infrared (DRIFT) spectra have been obtained for carbon monoxide adsorbed with and without H 2 O on Pt/K-LTL zeolite. The complex spectra of CO linearly adsorbed on highly dispersed Pt have been analyzed by the combination of Fourier self-deconvolution and curve fitting. The linear-CO spectrum is co…
Solid-state 13 C NMR analyses have been performed to obtain information about the microphase-separated structure for polyurethane (PUR) elastomer, which is prepared from p -phenylene diisocyanate (PPDI), poly(tetramethylene oxide) (PTMO), and 1,4-butanediol (BD). 13 C spin−lattice relaxation time ( T 1C ) analyses hav…
Dielectric spectroscopy was carried out on linear and three-arm star polyisoprenes (PI). The shape of the normal mode peak differed significantly from the corresponding mechanical terminal relaxation function, although the temperature dependencies measured for the two spectroscopies were similar. This represents a dep…
The paper describes the assessment of the wrinkle recovery of fabrics according to the grades of the replica plates supplied by the American Association of Textile Chemists and Colorists (AATCC), by laser scanning the surface of the plates and extracting certain geometrical features.
The hydrogen-bonding interactions in a series of poly(urethane−rotaxane)s were studied by infrared spectroscopy. Spectroscopic data along with a one-dimensional mean-field model was used to calculate the enthalpy of hydrogen bond formation involving a polyurethane N-H moiety and an ether oxygen atom located in a macro…
New porous polymers are synthesized from [Si6O9] and [Si8O12] cage precursors and characterised by 29Si and 13C solid-state NMR spectroscopy; the specific surface areas of the polymers vary from 12.2 to 573 m2 g–1.
Electrochemically stimulated adenosine 5‘-triphosphate (ATP) release from poly(pyrrole adenosine 5‘-triphosphate) (PP-ATP) was investigated using cyclic voltammetry. Two separate redox processes at E 1/2 = −0.4 and 0.0 V were clearly elucidated by switching the film in polyelectrolyte solutions and found to correlate…
Cyclic enamides 1 of a type useful in the synthesis of naturally occurring chlorins, isobacteriochlorins, and corrins have been prepared by a process involving 5- exo - dig cyclization of the appropriate acetylenic amides 11 . The desired cyclization is catalyzed by either n -Bu 4 NF or LiAl(NHBn) 4 .
The oxidation of polyethylene surfaces with a range of mild oxidizing agents enhanced by the use of ultrasound is described. The use of sonochemical methods allows significant levels of surface modification to be achieved using oxidizing agents such as hydrogen peroxide and persulfate salts around ambient temperatures…
The intercalation of a cationic azobenzene derivative, p-(ω-(trimethylammonio)pentyloxy)-p‘-(dodecyloxy)azobenzene bromide, into montmorillonite and the photochemical reaction of the intercalated dye have been investigated. The adsorbed azo dye cations form the head-to-tail aggregates in the interlayer space of montmo…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNovel Thin Film with Cylindrical Nanopores That Open and Close Depending on Temperature: First Successful SynthesisMasaru Yoshida, Masaharu Asano, Agneza Safranj, Hideki Omichi, Reimar Spohr, Johann Vetter, and Ryoichi KatakaiView A…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTMain-Chain Ferroelectric Liquid Crystal Oligomers by Acyclic Diene Metathesis Polymerization1David M. Walba, Patrick Keller, Renfan Shao, Noel A. Clark, Marc Hillmyer, and Robert H. GrubbsView Author Information Department of Chemistry and Biochemistry and Optoelectron…