Materials Literature
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The evolution of chemical and physical properties in a series of minesoils aged between 0 and 5 years, developed from spoil materials of the Meirama opencast lignite mine in Galicia (NW Spain), was studied. The soils are recovered without use of top-soil and are subject to identical management. In the surface horizon…
Reversible thermal phase transition was observed for Y 4 Al 2 O 9 at 1377°C with a hysteresis width of 78°C using differential scanning calorimetry. The enthalpy of the transition (Δ H ) was about 300 cal/mol. Powder X‐ray diffraction peaks of the high‐temperature phase, as well as the peaks of the low‐temperature pha…
To quantify grain‐size‐dependent sliding wear of polycrystalline alumina induced by grain‐boundary microfracture, an attempt is made to extend and combine Cho et al. 's fracture mechanics analysis and Fu and Evans' simple micro‐cracking theory. An analytical equation is derived to relate wear with microstructural para…
A general constitutive theory governing the mechanical behavior of staple yarns and including the effect of fiber slippage during yarn extension is presented in this paper. A differential equation describing the stress transfer mechanism as well as the slippage influence in a staple yarn is applied by which both the d…
Sachse A, Leike J, Röβling G, Wagner S, Krause W. Preparation and evaluation of lyophilized iopromide-carrying liposomes for liver tumor detection. Invest Radiol 1993;28:838-844. rationale and objectives. The objective of the present investigation was to demonstrate a new method for the production of iopromide-carryin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, polymerization, and characterization of novel semifluorinated methacrylates, including novel liquid-crystalline materialsChetan P. Jariwala and Lon J. MathiasCite this: Macromolecules 1993, 26, 19, 5129–5136Publication Date (Print):September 1, 1993Publication His…
Theoretical equations for dielectric, elastic and electromechanical properties of PZT (Pb(Zr, Ti)O 3 ) ceramics with open pores are derived as afunction of porosity based on the 3-3 model. This theory is applied to previous obtained experimental results. Some of them agree well with the theoretical results based on th…
In order to better understand liquid crystal alignment on a rubbed polymer surface, the authors investigated the relationship between the orientation of polymer molecules and the surface anchoring strength of liquid crystals on a rubbed surface. Measuring the IR-absorption and the optical retardation, it was found tha…
Tin-doped indium oxide (ITO) films, prepared by dc magnetron sputtering, were characterized by (photo)electrochemical measurements in aqueous H2SO4 solutions. Wavelength dependent photocurrent measurements were used to determine the optical band gap energy of these films. Electron excitation from the valence band to l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSlow dielectric relaxation of entangled linear cis-polyisoprenes with asymmetrically inverted dipoles. 1. Bulk systemsHiroshi Watanabe, Osamu Urakawa, and Tadao KotakaCite this: Macromolecules 1993, 26, 19, 5073–5083Publication Date (Print):September 1, 1993Publication Histo…
Abstract A new amphiphilic polymer, i.e., poly(ethylene oxide) (PEO)‐grafted butyl rubber (IIR‐g‐PEO), was synthesized by chemical modification of chlorinated butyl rubber (CIIR). This synthesis was based on the reaction between chlorine in CIIR and potassium salt of polyethylene glycol monomethyl ether (PEGM). PEGM's…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDeposition of copper sulfide on the surface of poly(ethylene terephthalate) and poly(vinyl alcohol) films in aqueous solution to give electrically conductive filmsTakakazu Yamamoto, Kuniaki Tanaka, Etsuo Kubota, and Kohtaro OsakadaCite this: Chem. Mater. 1993, 5, 9, 1352–135…
Abstract Polysiloxanes with covalently attached oligo ethylene oxide and di‐ t ‐butylphenol ( I ), naphthol ( II ), and hexafluoropropanol ( III ) were synthesized. The crosslinked polymers with a hexamethylene spacer were also prepared. The ion conductivities of the Li, Na, and K salts were measured as a function of…
Many discussions on packaging lead to undue expectations regarding the usability of degradable materials. There is also considerable misuse of the term “biodegradable.” The manufacture of a new foamed material based on native starch is discussed. The structure forms by water evaporation and gelatinization of starch du…
Tunable near-infrared optical parametric oscillation in an organic crystal has been achieved for the first time to our knowledge. A 1.9-mm-thick nonlinear molecular crystal of N-(4-nitrophenyl)-l-prolinol was pumped at a wavelength of 0.5927 μm and a pulse duration of 1 ns (FWHM). Tunability from 0.9 to 1.7 μm and a m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic reactions involving palladium(II) octabutoxynaphthalocyanine and molecular oxygenBoris D. Rihter, Malcolm E. Kenney, William E. Ford, and Michael A. J. RodgersCite this: J. Am. Chem. Soc. 1993, 115, 18, 8146–8152Publication Date (Print):September 1, 1993Publicat…
The crystal structure of PbTiO 3 film, which was prepared on a Pt/SiO 2 /Si substrate by metal organic chemical vapor deposition, was investigated along with its dielectric properties. The relative dielectric constant increased with increasing film thickness. Crystal structure difference was observed below 0.3 µm of f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of poly(p-phenylene-cis-benzobisoxazole) in methanesulfonic acidD. B. Roitman, R. A. Wessling, and J. McAlisterCite this: Macromolecules 1993, 26, 19, 5174–5184Publication Date (Print):September 1, 1993Publication History Published online1 May 2002Published…
After some introductory remarks on cellulose as a renewable and biodegradable polymer and the relevance of new nonaqueous solvent systems for its processing, a survey is presented on the composition, the method of action and potential applications of these solvent systems, with a distinction between “derivatizing” and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structural and magnetic studies of diazine-bridged complexes of copper(II) cyanate. Crystal structure of poly[bis(cyanato-N)bis(.mu.-methylpyrazine)copper(II)]Tom Otieno, Steven J. Rettig, Robert C. Thompson, and James TrotterCite this: Inorg. Chem. 1993, 32, 2…