Materials Literature
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The first measurements are reported of the electrical conductivity of semiconducting molybdenum tellurite glasses of various compositions over the temperature range 100-500 K. The electrical data have been analysed in the light of polaronic conduction models. The analysis shows that the adiabatic hopping theory is mos…
Long-rod composite insulators, having weather sheds made of room-temperature vulcanizing silicon rubber compounds (RTV) were exposed for many years to HVAC (high-voltage AC) and HVDC (high-voltage DC) under realistic conditions and natural pollution. It was found that the shed material, contrary to the experience gain…
Abstract
Apatite formation from organic matter (ribonucleic acid) and calcium carbonate (cuttlebone) requires intervention of microorganisms. We have attempted to characterize this mineral formation process by locating the alkaline phosphatase and the crystals formed. Alkaline phosphatase, which is important for the liberation…
Cascade molecules have been synthesized in which the initiation core and branch points of the cascade structure are quaternary phosphonium ion sites.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInstability of the nitrite/iron(III) porphyrinate systemMichael G. Finnegan, A. G. Lappin, and W. Robert ScheidtCite this: Inorg. Chem. 1990, 29, 2, 181–185Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990h…
Abstract Organoammonium-montmorillonites were formed from dehydrated sodium montmorillonite and organoammonium halides by solid-solid reactions. The formation depended on the sizes and counter anions of the ammonium ions used. The behavior was different from that observed in a conventional solution method.
Investigations of hexagonal ferrites as a gyromagnetic medium allow the analysis of phenomena related to ferromagnetic resonance (FMR) in ferrites with high internal anisotropy. In the present work, (Sc)- and (CoTi)-substituted M-type hexaferrite powders are examined on the basis of the general formula BaM/sub x/Fe/su…
Abstract The gelation of mixed solutions of silk fibroin (SF)/syndiotactic‐rich poly(vinyl alcohol) ( s ‐PVA), the thermal analysis of dry‐gels, and the various properties of blend films were investigated. The rate of gelation of a mixed solution was lower than that of each SF or s ‐PVA solution of the same concentrat…
An enhanced coercivity of sintered Nd-Fe-B permanent magnets by Al or Ga additions that is associated with a change in microstructure has been demonstrated. These microstructural modifications were detected by energy dispersive X-ray analysis (EDX)-assisted transmission electron microscopy (TEM). Two new ternary phase…
Different solvated charge-transfer salts between quinolin-8-ol (Hquin) and phosphotungstic acid have been synthesized and characterized. Spectroscopic data support the presence of a sizeable electronic interaction between electron-rich aromatic organics and the inorganic acid, both in the solid state and in solution,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDistribution of activation enthalpies in viscoelastic relaxationsHoward W. Starkweather Jr.Cite this: Macromolecules 1990, 23, 1, 328–332Publication Date (Print):January 1, 1990Publication History Published online1 May 2002Published inissue 1 January 1990https://pubs.acs.org…
Poly (L-lactic acid) [L-PLA] microcapsules containing phenobarbitone were prepared from a w/o emulsion system, using light liquid paraffin as the continuum and a solution of phenobarbitone and L-PLA in acetonitrile as the disperse phase. Increasing stirring rate and emulsifying agent concentration were found to reduce…
Water-soluble conducting poly(aniline propane sulphonic acid) and its sodium salt have been synthesized by derivatization of polyaniline; multiple and reversible colour changes were observed for polymer films on indium–tin oxide coated glass dipped in a LiClO4/acetonitrile solution between –0.4 and 1.2 V vs. Ag/AgCl,…
The need for resistance to surface tracking and erosion partially differentiates outdoor insulation from indoor insulation. A review of the current status of development of standards for testing these properties worldwide on materials and components is presented. Of special interest is the self-restoration of the hydr…
Three-dimensional (3-D) braiding technology using high-performance fibres for advanced composite structures is receiving great attention as a result of the outstanding mechanical and thermoelastic properties of the materials produced. There are now mainly two groups of 3-D braiding techniques, namely, the four-step an…
Experimental and theoretical results on polyimide-to-metal and -ceramic adhesion are briefly reviewed. In general, the polyimide-on-metal interfaces have stronger interactions vis-a-vis the metal-on-polyimide interfaces. A section is also devoted to adhesion promoters and their effect on the adhesion. Data from the li…
We present the phase diagram of a system of hard spherocylinders, including the isotropic liquid and the nematic and smectic-A liquid crystals, calculated with a nonlocal-density-functional model for the free energy. We get first- and second-order nematic--smectic-A transitions, with a tricritical point at L/D=50, and…
The reaction of [(cyclo-C6H11)7Si7O9(OSiMe3)(OH)2] with CrO3 leads to the formation of [(cyclo-C6H11)7Si7O11(OSiMe3)CrO2], a new crystallographically characterized silyl-chromate complex that catalyses the polymerization of ethylene in the presence of trialkylaluminium reagents.
Abstract A new method omitting oxygen removal procedures from polymerization mixtures was developed for graft polymerization of acrylamide (AAm) onto the surface of poly(ethylene terephthalate) (PET) film with the simultaneous UV irradiation method without photo‐sensitizer. UV irradiation of the PET film with a high p…