Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of narrow molecular-weight distribution fractions of poly(aryl ether ether ketone)Jacques Roovers, J. David Cooney, and Paul M. ToporowskiCite this: Macromolecules 1990, 23, 6, 1611–1618Publication Date (Print):March 1, 1990Publication History…
Abstract The conditions of polycondensation of dimethyl phosphonate ( 1 ) with different diols were elaborated, leading to polymers with molecular weights up to 3,3 · 10 4 . The novelty of the method is based on a two stage process. In the first stage an excess of 1 was used and short chains with methyl ester end grou…
By using α‐Si 3 N 4 and β‐Si 3 N 4 starting powders with similar particle size and distribution, the effect of α‐β (β') phase transition on densification and microstructure is investigated during the liquid‐phase sintering of 82Si 3 N 4 ·9Al 2 O 3 ·9Y 2 O 3 (wt%) and 80Si 3 N 4 ·13Al 2 O 3 ·5AIN·5AIN·2Y 2 O 3 . When α…
Four methods of force calculation are discussed and compared: equivalent current density, equivalent magnetic charges, the energy principle for both constant and field-dependent permeability, and Maxwell's stresses. Although the formulas for the surface force density are different, it can be shown that the same volume…
Castings to the ASME SA351 CF3 specification used in modern pressurised water reactor nuclear power stations are mainly austenitic, but contain up to 20% ferrite, and as a result are subject to loss of toughness in service at about 300°C. To show adequate end of life toughness, tests are being carried out on material…
Finite difference methods giving approximate solutions to the Cahn–Hilliard equation for phase separation in binary alloys and the results of numerical experiments in two dimensional space are described. Nucleation and growth and spinodal decomposition are considered.MST/1199
The thermodynamic properties of double oxides in rare earth‐transition metal (V and Mn)‐oxygen ternary systems have been collected and evaluated to examine their stability using chemical potential diagrams plotted as log (α A /α B ) vs log ( P (O 2 )). The thermodynamic regularities of perovskites, pyrochlores, and ot…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of nonionic hydrogel, lipogel, and amphigel by copolymerization of 2-oxazolines and a bisoxazolineYoshiki Chujo, Kazuki Sada, Kazuaki Matsumoto, and Takeo SaegusaCite this: Macromolecules 1990, 23, 5, 1234–1237Publication Date (Print):March 1, 1990Publication Histo…
Related DatabasesWeb of Science You must be logged in with an active subscription to view this.Article DataHistorySubmitted: 11 April 1988Accepted: 28 April 1989Published online: 17 February 2012Keywordskinetic undercooling, Stefan problem, supercooledAMS Subject Headings35K05, 35R35, 80A20Publication DataISSN (print)…
The Maier–Saupe theory for liquid crystals is extended to describe poling by an electric field of side-chain polymers with π-conjugated acceptor–donor molecules as pendant groups. Applications of the theory are in the field of nonlinear-optical materials. By using a quasi-one-dimensional description of the acceptor–do…
The reflection intensities of polyaniline films (PANI) in the range of 250–800 nm have been determined using a reflection spectrometer at different potentials and p Hs. The effect of potential and p H on the colors of PANI and the mechanism of the redox reactions have been discussed.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, crystal structure and magnetic properties of a pyrazolate-bridged binuclear copper(II) complexThompson N. Doman, Donald E. Williams, J. Fred Banks, Robert M. Buchanan, Hsiu Rong Chang, Robert J. Webb, and David N. HendricksonCite this: Inorg. Chem. 1990, 29, 5, 10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural coarsening of demixed polymer solutionsJ. H. AubertCite this: Macromolecules 1990, 23, 5, 1446–1452Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.org/doi/10.1021/ma00207a034https:/…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAromatic polyamide blends: enthalpy relaxation and its correlation with phase phenomenaThomas S. EllisCite this: Macromolecules 1990, 23, 5, 1494–1503Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pub…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrdered structure of thermotropic liquid-crystal polymer. 1. Characterization of liquid-crystal domain textureToshio Shiwaku, Akemi Nakai, Hirokazu Hasegawa, and Takeji HashimotoCite this: Macromolecules 1990, 23, 6, 1590–1599Publication Date (Print):March 1, 1990Publication…
Abstract The response of a HDPE, a L‐LDPE and a PP homopolymer to processing conditions and processing stabilizer formulations in the 220°C to 280°C temperature range was investigated. The technique of multiple extrusion was used. Melt flow and melt flow ratio were measured after the first, third and fifth extrusion p…
A new version of a corona triode setup, allowing charging dielectric foils with a constant current, was developed. The charging current is kept constant by controlling the grid voltage. We show that the sample surface potential can be inferred from the grid voltage and present results of the uniformity of charge depos…
A new model of interstellar silicon chemistry is presented that explains the lack of SiO detections in cold clouds and contains an exponential temperature dependence for the SiO abundance. A key aspect of the model is the sensitivity of SiO production by neutral silicon reactions to density and temperature, which aris…
A two-dimensional rhombus tiling model with a matching-rule-based energy is analyzed using real-space renormalization-group methods and Monte Carlo simulations. The model spans a range from T=0 quasiperiodic crystal (Penrose tiling) to a random-tiling quasicrystal at high temperatures. A heuristic picture for the diso…
L-Malate dehydrogenase from the extremely thermophilic mathanogen Methanothermus fervidus was isolated and its phenotypic properties were characterized. The primary structure of the protein was deducted from the coding gene. The enzyme is a homomeric dimer with a molecular mass of 70 kDa, possesses low specificity for…