Materials Literature
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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…
Fine‐grained β‐Ca 2 SiO 4 containing small amounts of sodium was fabricated as an analogue to tetragonal zirconia polycrystals (TZP) in order to study the stress‐induced β→γ transformation. This avoided the problems associated with the fabrication and evaluation of composites containing β‐Ca 2 SiO 4 . The microstructu…
The spin-lattice relaxation time ${\mathrm{\ensuremath{\tau}}}_{\mathit{s}\mathit{l}}$ is the characteristic time needed for the energy transfer between the lattice and the spin system. It is demonstrated that ${\mathrm{\ensuremath{\tau}}}_{\mathit{s}\mathit{l}}$ can be determined with laser-induced spin-polarized pho…
Transparent lead lanthanum zirconate titanate (PLZT) ceramics were fabricated from fine powders using an inexpensive two‐stage sintering technique. The powders were prepared by hydrolysis from low‐cost inorganic precursors. In the two‐stage sintering method, uniaxially pressed green pellets were densified to nearly th…
A model of magnetoelasticity based on the differential susceptibility, stress effective magnetic field, and stress demagnetization in conjunction with appropriate rules of hysteresis is presented and compared to experimental data for high-strength steels for several magnetoelastic processes. The authors observe a decr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of a bidisperse polymer brush: Monte Carlo simulation and self-consistent field resultsPik Yin Lai and E. B. ZhulinaCite this: Macromolecules 1992, 25, 20, 5201–5207Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDelocalization mechanism of ferromagnetic exchange interactions in complexes of copper(II) with nitroxyl radicalsR. N. Musin, P. V. Schastnev, and S. A. MalinovskayaCite this: Inorg. Chem. 1992, 31, 20, 4118–4121Publication Date (Print):September 1, 1992Publication History P…
Various spectra of Raman for different grain sizes of diamond powder have been studied. The spectra are also correlated to the results of transmission electron diffraction, transmission electron microscopy, scanning electron microscopy, and x-ray photoelectron spectroscopy. When the Raman peak intensity was decreased,…
A Bi 2 O 3 -TiO 2 phase diagram was determined using differential thermal analysis (DTA) apparatus. Bi 4 Ti 3 O 12 (BIT) micalike single crystals grown by a flux method were clear and slightly grayish in color. Ferroelectric and dielectric properties of BIT crystals were observed from measurements of electric displace…