Materials Literature
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Abstract Sequential diblock copolymers composed of L ‐ and D ‐lactic acid residues were synthesized through a living ring‐opening polymerization of L ‐ and D ‐lactide initiated by aluminium tris(2‐propanolate). The composition of the block copolymers was varied by changing the reaction conditions and monomer over init…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRare-earth ions adsorbed onto porous glass: luminescence as a characterizing toolM. F. Hazenkamp and G. BlasseCite this: Chem. Mater. 1990, 2, 2, 105–110Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMonomeric and dimeric vanadium(IV) and -(V) complexes of N-(hydroxyalkyl)salicylideneamines: structures, magnetochemistry and reactivityCarl J. Carrano, Christine M. Nunn, Roger Quan, Joseph A. Bonadies, and Vincent L. PecoraroCite this: Inorg. Chem. 1990, 29, 5, 944–951Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBonding models for ligated and bare clustersD. Mike P. Mingos, Tom Slee, and Lin ZhenyangCite this: Chem. Rev. 1990, 90, 2, 383–402Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.org/doi/10.10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving pseudoanionic polymerization of iε-caprolactone. Poly(iε-caprolactone) free of cyclics and with controlled end groupsAndrzej Duda, Zbigniew Florjanczyk, Andrzej Hofman, Stanislaw Slomkowski, and Stanislaw PenczekCite this: Macromolecules 1990, 23, 6, 1640–1646Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSingle-crystal x-ray structures of the polyoxotungstate salts K8.3Na1.7[Cu4(H2O)2(PW9O34)2].cntdot.24H2O and Na14Cu[Cu4(H2O)2(P2W15O56)2].cntdot.53H2OTimothy J. R. Weakley and Richard G. FinkeCite this: Inorg. Chem. 1990, 29, 6, 1235–1241Publication Date (Print):March 1, 199…
It has been found that the respective substitutions of La and Ni in by small amounts of Zr and Al remarkably improved the cycle life of the alloy anode, scarcely causing a lowering of capacity. In order to clarify the mechanism, the relations between chemical compositions and anode properties for , such as capacity, c…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInteraction of metals and protons with algae. 2. Ion exchange in adsorption and metal displacement by protonsRay H. Crist, J. Robert Martin, Paul W. Guptill, Jill M. Eslinger, and DeLanson R. CristCite this: Environ. Sci. Technol. 1990, 24, 3, 337–342Publication Date (Print)…
Abstract In this paper, the approach of biodegradation to reduce the environmental impact of plastic wastes is reviewed. The mechanism of biodegradation and the processing and applications of these materials are also discussed in relation to the structural characters of their molecules. The synthetic biodegradable mat…
We discuss the motion of a triple line for a fluid spreading on a flat solid surface in conditions of partial wetting: the equilibrium contact angle θ e is assumed to be finite but small: 0 < θ e [Lt ] 1. We distinguish four regions: (1) a molecular domain of size a (≈ a few Ångströms) very near the triple line, wh…
We report a computer-simulation study of the phase diagram of a system of hard spherocylinders with aspect ratio L/D between 0 and 5. For L/D\ensuremath{\le}3 only isotropic liquid and crystalline solid phases can occur. For L/D=3 a mechanically stable smectic phase occurs, but it is thermodynamically unstable. For la…
A quantitative surface analysis by Auger-electron spectroscopy (AES) or x-ray photoelectron spectroscopy (XPS) requires a series of operations that typically includes instrument setup, specimen positioning, data acquisition, data manipulation, and data analysis. These operations involve a sequence of measurements whic…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTracer diffusion at the glass transitionDietmar Ehlich and Hans SillescuCite this: Macromolecules 1990, 23, 6, 1600–1610Publication Date (Print):March 1, 1990Publication History Published online1 May 2002Published inissue 1 March 1990https://pubs.acs.org/doi/10.1021/ma00208a…
Intense fluid motions can be generated by the solidification of a binary liquid. This review paper describes systematically some of the concepts involved in the fluid mechanics of solidification. It also presents quantitative calculations for the fluid motion, the rate of growth of solid and the evolution of both the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthetic and structural studies of sapphyrin, a 22-.pi.-electron pentapyrrolic "expanded porphyrin"Jonathan L. Sessler, Michael J. Cyr, Vincent Lynch, Ellen McGhee, and James A. IbersCite this: J. Am. Chem. Soc. 1990, 112, 7, 2810–2813Publication Date (Print):March 1, 1990P…
Laser granulometry is a rapid method for determination of particle size distribution in both dry and wet phases. The present paper, diffraction technique by laser beams is an application to the granulometric studies of pozzolanic materials in suspension. Theses granulometric analysis are compared to those obtained wit…
This article studies the influence of addition of different quantities of slag and compares this with the addition of fine particled silica sand. The mortar samples (1:3) of 1 x 1 x 6 cm —prepared with a sulphate-resistent portland cement, mixed with a selected slag and with silica sand were subjected to the action of…
The results of a series of laboratory tests, carried out on the bioclastic limestone used in the construction of the Murcia cathedral, are presented in this paper in order to evaluate the efficiency of certain treatment products, that eventually could be applied to that stone for improving their state of conservation.…
Important factors of deterioration which contribute significately to the worrying state of degradation of the petreous materials in the Cathedral of Seville, essentially those used for ornamental objects, are those of anthropogenic nature which through corrosion mechanisms (chemical deterioration) determine the main m…