Materials Literature
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A study of the dielectric response as a function of frequency (${10}^{2--}$${10}^{6}$ Hz) and temperature (4.2--300 K) in ceramic and c-axis-oriented single-crystal samples of ${\mathrm{PrBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{\mathit{x}}$ reveals dielectric constants >${10}^{3}$ at low frequencies in both case…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFrequency-resolved faradaic processes in polypyrrole films observed by electromodulation techniques: electrochemical impedance and color impedance spectroscopiesT. Amemiya, K. Hashimoto, and A. FujishimaCite this: J. Phys. Chem. 1993, 97, 16, 4187–4191Publication Date (Print…
Abstract The effect of structure on the sorption kinetics of water and of various organic solutes into polyimide (PMDA‐ODA) thin films was studied. The major techniques employed include measurements of sorption kinetics, density, and dielectric relaxation. More solute uptake, lower densities and higher diffusivities w…
Abstract To elucidate the effect of tin compounds in the ring‐opening polymerization of lactides and lactones, D,L‐dilactide was taken as an example, and its reaction with different tin compounds at a molar ratio of 1:1 as well as the polymer formation and degradation in dependence of its concentration has been invest…
Author: Kannan, R. M. et al.; Genre: Journal Article; Issued: 1993; Title: RHEOLOGY OF SIDE-GROUP LIQUID-CRYSTALLINE POLYMERS - EFFECT OF ISOTROPIC<br/> NEMATIC TRANSITION AND EVIDENCE OF FLOW-ALIGNMENT
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel controlled luminescence of tris(2,2'-bipyridine)ruthenium(II) intercalated in a fluortetrasilicic mica with poly(vinylpyrrolidone)Makoto Ogawa, Misako Inagaki, Nobuhiro Kodama, Kazuyuki Kuroda, and Chuzo KatoCite this: J. Phys. Chem. 1993, 97, 15, 3819–3823Publication…
A new type of photochromic compounds, diarylethene derivatives, has been developed for optical data storage media. The photochromic dye - polymer media had read-out stability more than 106 times, and write/erase cycles could be repeated 3 × 103 times without loss of performance.
In this paper we describe the solvent extraction behaviour of three calixarene-type cyclophanes towards trivalent lanthanides Ln3+ (Ln = La, Nd, Eu, Er and Yb). By using p-tert-butylcalix/6/arene hexacarboxylic acid (LI), the lanthanides were extracted from the aqueous phase at pH 2 to 3.5 into chloroform according to…
The maximum-entropy method (MEM) is a very powerful method for deriving accurate electron-density distributions from X-ray diffraction data. The success of the method depends on the fact that the electron density is always positive. In order to analyse neutron diffraction data by the MEM, it is necessary to overcome t…
ABSTRACT: The ability of terminal model kinetics to predict copolymer microstructure was tested for the styrenemethyl methacrylate system copolymerized at 40 O C at various fractions of monomers. Carbon-13 NMR studies (in the accompanying paper) showed that previous peak assignments of the spectra of statistical styre…
Abstract The clay mineralogy of tuffs from Yucca Mountain, Nevada, the potential site of the nation's first high-level radioactive waste repository, has been studied in order to understand the alteration history of the rocks and to predict potential future alterations. Bulk-rock samples and clay-mineral separates from…
A series of atomistic calculations is performed in order to evaluate the effects of several physical factors on dislocation emission in a model hexagonal lattice. The method of calculation is the lattice Green's-function method, together with several pair potentials with variable parameters. The physical factors of in…
The third‐order nonlinear optical susceptibilities, X (3) , of the xLaO 1.5 ·(100 – x)TeO 2 binary glasses have been measured by the third harmonic generation (THG) method. In order to investigate the origin of high‐intensity third harmonic generation, the various optical properties, such as nonlinear refractive index…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, properties, and characterization of nanometer-size metal particles by homogeneous reduction with alkalides and electrides in aprotic solventsKuo Lih Tsai and James L. DyeCite this: Chem. Mater. 1993, 5, 4, 540–546Publication Date (Print):April 1, 1993Publication H…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization and extremely low defect density hexadecanethiol monolayers on mercury surfacesAlebachew Demoz and D. Jed HarrisonCite this: Langmuir 1993, 9, 4, 1046–1050Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInterfacial phase transitions in block copolymer/homopolymer blendsKenneth R. ShullCite this: Macromolecules 1993, 26, 9, 2346–2360Publication Date (Print):April 1, 1993Publication History Published online1 May 2002Published inissue 1 April 1993https://pubs.acs.org/doi/10.10…
Abstract Neben den Polyisoprenoiden, Polypeptiden, Polysacchariden und Polynucleotiden kommt in der Natur eine weitere Gruppe von Biopolymeren, die Poly(hydroxyfettsäureester), vor. Obwohl der häufigste Vertreter, Poly[(R)‐3‐hydroxybuttersäure| P(3‐HB), von Lemoigne schon in den zwanziger Jahren als Speichermaterial d…
Large cavities with segregated hydrophobic and hydrophilic domains result from the inclusion of inorganic and organic canons in the hydrothermal synthesis of the blue compound 1. Its structure is shown in the picture on the right.
The orientation characteristics of polypropylene are studied with respect to annealing temperature, orientation temperature, stretch ratio and mode of extension, in order to determine optimum orientation conditions.
Polyimides containing imide and (p-phenoxy)imide side groups were obtained by the interaction of new aromatic tetramines, bis[3-amino-4-(p-aminophenoxy)]arylenes, with equimolar amounts of aromatic tetracarboxylic acid dianhydrides and twofold molar amounts of aromatic dicarboxylic acids anhydrides. Structures and pro…