Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass transition and melting behavior of poly(ethylene 2,6-naphthalenedicarboxylate)Stephen Z. D. Cheng and Bernhard WunderlichCite this: Macromolecules 1988, 21, 3, 789–797Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular ferromagnetsJoel S. Miller, Arthur J. Epstein, and William M. ReiffCite this: Acc. Chem. Res. 1988, 21, 3, 114–120Publication Date (Print):March 1, 1988Publication History Published online1 May 2002Published inissue 1 March 1988https://doi.org/10.1021/ar00147a004Re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructure of isotactic polypropylene prepared with homogeneous catalysis: stereoregularity, regioregularity, and 1,3 insertionAlfonso Grassi, Adolfo Zambelli, Luigi Resconi, Enrico Albizzati, and Romano MazzocchiCite this: Macromolecules 1988, 21, 3, 617–622Publication…
Abstract Intercalated compounds of montmorillonite and poly-6-amide were prepared by heating mixtures of ɛ-caprolactam and 5, 10, 15 and 30 wt% of montmorillonite, cation-exchanged with NH3+(CH 2 ) 11 COOH, at 250°C in a nitrogen atmosphere, and examined by X-ray powder diffraction (XRD), transmission electron microsc…
Abstract We discuss some theoretical aspects of interfacial and emulsifying activity of block copolymers A‐B in incompatible blends of homopolymers A and B. We predict the reduction in interfacial tension due to equilibrium adsorption of copolymers at the interface. It is shown that for an appropriate choice of block…
This research work, which will include four publications, was done as a result of the discussions, doubts and controversies which were originated some time ago about the ASTM C 452 method and specially on its 7.0% SO3 content. To clarify this two portland cements P-1 (14.11% C3A) and P-31 (7.62% C3), all it industriéi…
In this works, we have modified a bitumen from Amposta by using the Friedel and Crafts reaction with toluylene-2,4-diisocyanate in presence of aluminium trichloride, presenting as well as the characteristics of the original bitumen as the ones of the modification products. We have made technological test, aging of thi…
The purpose of this study is the characterization of fly ashes produced by Spanish thermoelectric power plants, according to sampling taken in 1981 and 1982. The study takes in the following characteristics: physical characteristics (size distribution of particles, ...); chemical ones (chemical analysis...); and miner…
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A procedure for the determination of sulphides attackable by HCI (1 :3) in cements by means of a potentiometric determination with a selective electrodo of sulphides, is proposed.
The relaxivity, biodistribution, and toxicity of the gadolinium-tetraazacyclododecanetetraacetic acid (Gd-DOTA) complex were evaluated. This cyclic complex has much greater in vitro stability (10(28)) than similar noncyclic complexes such as gadolinium-diethylenetriaminepentaacetic acid (Gd-DTPA) (10(23)) or gadoliniu…
For a solid containing preexisting flaws, overall nonlinear constitutive relations are developed on the basis of a model which endows a preexisting flaw with frictional and cohesive resistance, and which includes nucleation and growth of tension cracks at the preexisting flaw, as it deforms under the action of an over…
Abstract Results are given of an assessment of a Rietveld-type X-ray powder diffraction pattern fitting structure refinement technique for assaying powdered mixtures as an alternative to conventional discrete peak empirical methods of the type described by Klug and Alexander (1974) and Chung (1974). The values obtaine…
Abstract Oxygen semipermeability of LnCoO3-based perovskite-type oxides changed drastically by the partial substitution of A site and B site cations, Ba and Cu being the most effective substituents, respectively. Host rare earth cations (Ln) also affected the oxygen semipermeability, which increased with a decrease in…
We study the statistics of a grafted polymer brush, consisting of a set of monodisperse chains in solution, each attached irreversibly by one end to a flat surface. We use a self-consistent field method, valid in the limit of weak excluded volume and at moderately high surface coverage. Exploiting the fact that the ch…
Three methods have been used to extract iron (Fe) and aluminium (Al) from a wide range of soils. The three extractants were pyrophosphate reagent (p), acid-oxalate reagent (o), and dithionite-citrate reagent (d), and each reagent is thought to extract different forms of Fe and Al. The forms of Fe in the soils were stu…
The phase diagram and dynamical properties of systems of particles interacting through a repulsive screened Coulomb (Yukawa) potential have been calculated using molecular and lattice dynamics techniques. The phase diagram contains both a melting transition and a transition from fcc to bcc crystalline phases. These ph…
Continuum Damage Mechanics (C.D.M.) has developed continuously since the early works of Kachanov and Rabotnov. It constitutes a practical tool to take into account the various damaging processes in materials and structures at a macroscopic continuum level. The main basic features of C.D.M. are considered in the first…