Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalculation of the phase separation behavior of sheared polymer blendsR. Horst and B. A. WolfCite this: Macromolecules 1992, 25, 20, 5291–5296Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pub…
Raman spectra are reported for fresnoite (Ba 2 Ti(Si,Ge) 2 O 8 glasses, and comparison is made between the Raman spectra of the corresponding crystalline powders and glasses of Ba 2 TiSi 2 O 8 and Ba 2 TiGe 2 O 8 . The Ba 2 TiGe 2 O 8 glass spectra show correspondence with the Ba 2 TiGe 2 O 8 crystalline Raman spectra…
Introduction of silver into a silicate glass often leads to reduction and coloration. The electron required for silver reduction is extracted from a nonbridging oxygen atom. The use of high-field-strength ions limits the number of nonbridging oxygens and silver reduction.
We present a phenomenological Landau–de Gennes-type theory of strain effects on concentration fluctuations in "soft" elastic two-component solids. Introducing concentration-dependent elastic moduli and a coupling between the strain and concentration fields we find that, for systems which exhibit nearly linear elastic…
Small droplets in size of 20--1000 \ensuremath{\mu}m of Al-Mn alloys have been undercooled by containerless solidification during free fall in a drop tube or by melt atomization. The as-solidified droplets were analyzed with respect to the phases formed from the undercooled melt by electron microscopy, x-ray diffracti…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDirect hydroxylation at the meso position of gold(III) tetraphenylporphyrin by nucleophilic addition: novel hydroxyphlorin derivativesHiroshi Segawa, Reiko Azumi, and Takeo ShimidzuCite this: J. Am. Chem. Soc. 1992, 114, 19, 7564–7565Publication Date (Print):September 1, 199…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical study of chemisorption of carbon monoxide on copper clustersMartin A. Nygren and Per E. M. SiegbahnCite this: J. Phys. Chem. 1992, 96, 19, 7579–7584Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 Septemb…
The cubic magnetic anisotropy constants of ${\mathrm{Fe}}_{3(1\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}})}$${\mathrm{O}}_{4}$ single crystals (with 0.0000.006), obtained by curve fitting of the respective magnetization curves, are reported between room temperature and the isotropic point (\ensuremath{\sim}130…
The mixed chain triacylglycerol 1,2-dipalmitoyl-3-acetyl-sn-glycerol was synthesized and its crystal structure was determined to a final reliability factor (R) of 0.11. Two molecules are present in the monoclinic unit cell: space group P2(1); a = 5.375(1), b = 8.286(2), c = 42.96(1) A; beta = 93.30(2) degrees, V = 191…
We analyze the transverse dielectric response function and the collective excitations in a strongly coupled one-component plasma (OCP). The collective modes are either photonlike or phononlike. The latter, which are maintained by shear, are unique to the strongly coupled system. We employ the recently established quas…
Abstract Thermal properties of Fortron® ®Registered trademark of Hoechst Celanese Corporation. poly(phenylene sulfide) (PPS) polymers of different molecular weights were studied by DSC. Crystallization studies revealed that the ability of these polymers to crystallize decreases with increasing molecular weight. The Av…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh molar mass polysilazane: a new polymerEtienne Duguet, Michele Schappacher, and Alain SoumCite this: Macromolecules 1992, 25, 19, 4835–4839Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September 1992https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMono- and dinuclear titanium(III)/titanium(IV) complexes with 1,4,7-trimethyl-1,4,7-triazacyclononane (L). Crystal structures of a compositionally disordered green and a blue form of [LTiCl3]. Structures of [LTi(O)(NCS)2], [LTi(OCH3)Br2](ClO4), and [L2Ti2(O)2F2(.mu.-F)](PF6)…
New annelated terheterocycles have been synthesized and their properties compared with those of the parent systems. The new compounds have mixed structural elements coming from benzo[c]heterocycles, which combine an o ‐quinoidal π‐system. The preceding article in this issue, from Lorcy and Cava, describes similar but…
A realistic computer model is presented for calculating the time‐dependent volume fraction transformed during the devitrification of glasses, assuming the classical theory of nucleation and continuous growth. Time‐ and cluster‐dependent nucleation rates are calculated by modeling directly the evolving cluster distribu…
Packing energy calculations have been performed on both alpha and gamma forms of crystalline isotactic polypropylene with the following objectives: (a) to compare the stability of the two crystal lattices; (b) to compare the effects of the up-down statistical disorder in the two polymorphs; (c) to investigate the stab…
The acoustic emission (AE) response of a low-carbon type 304 stainless steel (SS) (UNS S30400) during pitting and transgranular stress corrosion cracking (TGSCC) has been measured. Tests were conducted in 0.01 and 1 M NaCl with the pH adjusted to 1 with HCl at potentials of –380 mV and 0 mV (SCE) for no applied stress…
The first polyhydroxyalkanoic acid (PHA) synthase gene (phbCRr) of a Gram-positive bacterium was cloned from a genomic library of Rhodococcus ruber in the broad-host-range plasmid vector pRK404. The hybrid plasmid harboring phbCRr allowed the expression of polyhydroxybutyric acid (PHB) synthase activity and restored t…
Abstract The development of integrated soil fertility programs will involve the consideration of mineralogical and taxonomical classifications of soils. The objective of this work was to investigate K and Mg release from silt and clay fractions of four Québec soils. All soils were characterized by a mixed clay mineral…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of poly(ethylene ether carbonate) diols: proposed mechanism and kinetic analysisRobson F. Storey and Douglas C. HoffmanCite this: Macromolecules 1992, 25, 20, 5369–5382Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published…