Materials Literature
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Abstract In this study, three different polymers were blended: a racemic PMEPL (PMEPL‐RAC) which consists of a random distribution of repeat units of R or S configurations, an isotactic PMEPL made of repeat units of S configuration [PMEPL‐S(−)], and a second isotactic PMEPL made of repeat units of R configuration [PME…
Abstract This paper discusses the results of a detailed study of the relationships between molecular orientation, physical properties, and molecular weight of polyethylene terephthalate (PET), and their dependence on orientation variables. The molecular weight range of the samples used in this study included weight av…
A new type of electret transducer based on the use of an SiO2 backplate electret is presented. Frequency-response measurements on a prototype device demonstrate the feasibility of the design. Possible improvements and the main advantages of the new transducer principle are discussed.
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Yasufumi Otsubo, Kaoru Umeya; Rheological Properties of Silica Suspensions in Polyacrylamide Solu…
Ferroelectric tetragonal tungsten bronze (T.B.) family single crystals, e.g., SBN, BSKNN, KLN, SKN and PBN, have been grown and their ferroelectric properties have been investigated. The results show that the dielectric, piezoelectric, and electromechanical coupling coefficients are significantly large for these cryst…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrophilic polyurethane networks based on poly(ethylene oxide): synthesis, characterization, and properties. Potential applications as biomaterialsYves Gnanou, Gerard Hild, and Paul RemppCite this: Macromolecules 1984, 17, 4, 945–952Publication Date (Print):April 1, 1984Pub…
Soda‐silica and soda‐lime‐silica glasses were prepared with varying amounts of Si 3 N 4 , to produce oxynitride glasses with nitrogen contents up to 3.23 mol%. The glasses were analyzed by Fourier transform infrared spectroscopy and X‐ray photoelectron spectroscopy, and evidence for the formation of tricoordinated nit…
Abstract Solid-state 29 Si and 27 Al NMR spectroscopy with magic-angle spinning was used to study two smectites, two illites and a vermiculite. 27 Al NMR was able to directly observe the coordination of aluminium. 29 Si NMR was sensitive to both the chemical nature of the interlayer species and the presence of alumini…
Four series of polyurethane elastomers were synthesized using diphenylmethane diisocyanate (MDI) and castor oil as the polyol. Two types of MDI (crude and distilled) were used. The temperature of reaction and the effect of excess isocyanate above stoichiometric were also varied. The structure of the polyurethanes was…
The vacuoles of Neurospora crassa, grown in minimal medium, contain a 1:1 ratio of basic amino acids and phosphate, the latter in the form of long-chain, inorganic polyphosphate-P. Vacuoles isolated from cells depleted of polyphosphate retain basic amino acids despite the absence of over 90% of their polyphosphate. Th…
Abstract 1 H and 13 C NMR studies on magnesium anthracene ⋅ 3 THF ( 2a ), which can be recrystallized from THF, indicate that magnesium has the strongest interaction with the 9,10‐positions of anthracene. While the rate of formation of 2a from magnesium and anthracene in THF at 60°C is proportional to both anthracene…
The glass‐transition temperature ( T g ) is a fundamental property of all organic binders, It is illustrated with polyethylene glycol (PEG)‐plasticized polyvinyl alcohol (PVA) binder systems that densification is enhanced when the binder T g , is below the pressing temperature. This is a result of the increased deform…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectronic structures of transition-metal tetrachalcogenides (MSe4)nI (M = Nb, Ta)Pascal Gressier, Myung Hwan Whangbo, Alain Meerschaut, and Jean RouxelCite this: Inorg. Chem. 1984, 23, 9, 1221–1228Publication Date (Print):April 1, 1984Publication History Published online1 M…
The temperature dependence of the pyroelectric coefficient γd of (Na½Bi½)TiO3 ceramics has been measured. It was found that this crystal is a perspective material for using as a sensitive element of the pyroelectric radiation detectors steadily working in the temperature range of ∽ 20—60°C (γd = 2.5 ' 10-8C cm-2 °C-1;…
Abstract The creep behavior of ultrahigh‐modulus polyethylene monofilaments has been studied over the temperature range 20–70°C. A wide range of samples was examined in an attempt to determine the influence of draw ratio, molecular weight, copolymerization, and crosslinking by γ irradiation Prior to drawing. Results a…
Angle-resolved ultraviolet photoemission spectroscopy (ARUPS) has been used to study the p(2×1) oxygen-induced reconstruction of Cu(110). While there is agreement between experimental groups that the O atoms sit in the long-bridge site along the 〈001〉 Cu directions, there are two proposed models for the reconstruction…
Abstract Thin films of polystyrene (PS) are bonded to copper grids and crosslinked with electron irradiation. When the films are strained in tension regions of local plastic deformation, either crazed or plane stress deformation zones (DZs), nucleate and grow from dust particles. the nature of the local deformation, a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNovel triicosahedral structure of the largest metal alloy cluster: hexachlorododecakis(triphenylphosphine)-gold-silver cluster [(Ph3P)12Au13Ag12Cl6]m+Boon K. Teo and Kelly KeatingCite this: J. Am. Chem. Soc. 1984, 106, 7, 2224–2226Publication Date (Print):April 1, 1984Publicatio…
A new method has been developed to study non-equilibrium transport and energy relaxation phenomena in disordered organic and inorganic semiconductors. Given a distribution of localized states, the mean-square displacement and average energy of the excitation may be evaluated as functions of initial energy and time. Th…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase transformations of liquid crystalline side-chain oligomersH. Stevens, G. Rehage, and H. FinkelmannCite this: Macromolecules 1984, 17, 4, 851–856Publication Date (Print):April 1, 1984Publication History Published online1 May 2002Published inissue 1 April 1984https://pub…