Materials Literature
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Abstract The structure of rigid-chain polyesters and polyamides which possess flexible side chains consisting of methylene or 1,4,7-trioxaoctyl oxide units have been investigated by means of X-ray scattering. The X-ray studies were performed on fibres and monodomains. Additional information was gained from calorimetri…
Unusual regioselectivity towards internal allylic double bonds in preference to terminal allylic double bonds is displayed using the newly synthesized vanadium-pillared montmorillonite catalyst.
Abstract Phase behavior of blends of bisphenol A polycarbonate (PC) with polystyrene (PS), poly(styrene‐co‐acrylonitrile) (SAN), poly(acrylonitrile‐butadiene‐styrene) (ABS), poly(methyl methacrylate) (PMMA), poly(ethylene terephthalate) (PET), and poly(butylene terephthalate) (PBT) has been investigated. Blends were p…
Part 1 Introduction to basic concepts of LPE: epitaxy phase equilibria choice of LPE growth temperature basic LPE growth processes impurity segregation advantages and disadvantages of LPE as a growth technique for device materials. Part 2 Short summary of LPE apparatus and techniques: LPE growth systems and boat desig…
Techniques that can be used to provide corrosion-resistant layers for NdFeB magnets are discussed along with methods of assessing the long-term reliability of coatings. Tests show good results with IVD (ion-vapor-deposited) aluminum and cathodic electropaint deposited coatings, with significantly less corrosion protec…
In the CANDU nuclear reactor, pressure tubes made from Zr-2·5 Nb contain the fuel and the heat-transport heavy water. At each end, the tube is connected to a stainless steel end fitting by a rolled joint. A thin Zircaloy tube surrounds the pressure tube and the annular space between the tubes contains an inert gas. If…
Rhombohedral calcite crystals grown from supersaturated solutions undergo an unusual and specific morphological change in the presence of Li; the doped crystals are structurally invariant but exhibit well-developed basal (001) faces indicating that these relatively high energy crystal surfaces are stabilised by the in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses and thermal properties of new liquid crystals bearing a crown ether ring: cation binding in the nematic phaseGong Xin He, Fumio Wada, Kiyoshi Kikukawa, Seiji Shinkai, and Tsutomu MatsudaCite this: J. Org. Chem. 1990, 55, 2, 541–548Publication Date (Print):January 1…
Abstract
Joining technologies of ceramics to metals have been advanced in recent few years. There have a lot of difficult problems to be overcome in developing joining techniques. To control the chemistry of interfaces is, of course, one of the big key points. The active metal brazing has been established for solving this prob…
Advances in the theory and practice of stress corrosion cracking (SCC) are reviewed for the period 1965–1990. The proceedings of two landmark conferences are used as a basis for discussion: Ohio State University (1967) and Kohler, WI (1988). The discussion is developed around the following topics: metal–environment co…
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…