Materials Literature
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P(VDF-TrFE) copolymers with approximately 30 mol% of TrFE content exhibit above room temperature a ferroelectric transition of first order type with a large thermal hysteresis. We present recent investigations of the ferroelectric phase and of the phase transition using several techniques: second harmonic generation o…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe biosynthesis and characterization of poly(β-hydroxyalkanoates) produced by Pseudomonas oleovoransRichard A. Gross, Christopher DeMello, Robert W. Lenz, Helmut Brandl, and R. Clinton FullerCite this: Macromolecules 1989, 22, 3, 1106–1115Publication Date (Print):March 1, 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCompatibilizing effect of block copolymers added to the polymer/polymer interfaceSpiros H. Anastasiadis, Irena Gancarz, and Jeffrey T. KobersteinCite this: Macromolecules 1989, 22, 3, 1449–1453Publication Date (Print):March 1, 1989Publication History Published online1 May 20…
Abstract Most of the industrial plastics used up to now consist of flexible macromolecules in which the repeat units are joined together in a nonlinear fashion by rotating bonds. Stiff‐chain polymers, which in the ideal case have a rodlike shape, have received much less attention. The reason for this is that such poly…
Redox titration results and electronic spectral evidence show that the oxidation state of the “emeraldine” base form of polyaniline can vary depending on whether its synthesis is performed in the presence or absence of air. Chemical doping of leucoemeraldine, the completely reduced form of polyaniline, to selected oxi…
Most solids begin to melt at temperatures well below the bulk transition, by forming surface layers of liquid a few molecules thick. Although it is difficult to detect by direct observation, the phenomenon known as surface melting is believed to play important roles in many technical and natural processes, including t…
Extractos de los artículos publicados en el n.° 398 de "Informes de la Construcción", número especial dedicado a conmemorar el 40 aniversario de la revista.
This work presents the methodological procedure done on the analysis of ancient mortars from two middle-age castles, the one of Camargo (Vlll century) and the Torrejón at Las Henestrosas (XIII century), both in Cantabria. The analysis pretends to get complementary information to the previous one obtained from the arch…
The tricalcium silicate (alite) hydration velocity in cements with and without additives is studied in the presence of "Las Carolinas" quarry tuffs from Cienfuegos province, Cuba, the alite hydration velocity is enhanced reaching velocity constants 1.5 higher than in the standard cement.
Low calcium fly ash has demonstrated to be an effective pozzolan to improve sulfate resistance of ordinary portland cement (type I). In this paper physico-chemical effects that produce this pozzolan in the mortar exposed to sulfate attack are studied. Dilution and dispersion affects are analyzed using mixes of cement…
En este trabajo se estudia la influencia de la presencia de rocas silíceas opalinas, procedentes de las provincias de Salamanca, Zamora y Avila, en las propiedades de los cementos mixtos fabricados con cemento portland y proporciones variables de estas rocas utilizadas como adiciones activas. La caracterización de est…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructural changes accompanying hydration in nylon 6N. S. Murthy, M. Stamm, J. P. Sibilia, and S. KrimmCite this: Macromolecules 1989, 22, 3, 1261–1267Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published inissue 1 March 1989https://pu…
Abstract Homogeneous and heterogeneous phase relationships in the alkali feldspars are reviewed, and behaviour diagrams developed. Al,Si ordering is almost certainly continuous and higher order in both albite and potassium feldspar and has been established reversibly or nearly so down to below 500°C in albite and poss…
Abstract The non‐Newtonian viscosities of polymerically stabilized colloidal suspensions are usually predicted and correlated on the basis of data and scaling principles for Brownian hard spheres. Here, the specific effect of the stabilizer layer is investigated using suspensions of monodisperse PMMA particles with a…
An approximate analytical formulation is presented that allows for the calculation of acoustic pressure thresholds for transient cavitation over a variety of frequencies and host fluid parameters. Specifically, R.E. Apfel's (1986) theory is extended to include an estimate of the time delay associated with the Laplace…
Electrochemical and iodometric measurements on anodically charged thin film nickel hydroxide electrodes indicated an average nickel valence of . In situ visible spectroscopy of nickel hydroxide deposited on optically transparent electrodes featured one strong and broad absorption band with an intensity proportional to…
Polyethylene oxide(PEO)-containing nonionic polymeric surfactants were studied as a possible means to produce PEO-rich surfaces by a simple coating treatment of a common hydrophobic medical material--polyethylene. Surface tension and adsorption properties of PEO/polypropylene oxide(PPO) and PEO/polybutylene oxide(PBO)…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStarburst dendrimers. 5. Molecular shape controlAdel M. Naylor, William A. Goddard III, Garry E. Kiefer, and Donald A. TomaliaCite this: J. Am. Chem. Soc. 1989, 111, 6, 2339–2341Publication Date (Print):March 1, 1989Publication History Published online1 May 2002Published ini…