Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric normal mode spectroscopy in the ordered and disordered states of diblock copolymersB. Stuehn and F. StickelCite this: Macromolecules 1992, 25, 20, 5306–5312Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1…
Three {V3O13} units linked to form a ring that encloses the central V atom are found in the VV title compound. The VIV/VV cluster consists of a layered structure composed of three {V2As2O4} rings. These are further examples of the exotic structures which are par for polyoxometalates. They show the profound influence t…
Abstract Oligomers of α‐pinene ( 1 ) with relatively high molecular weight (number‐average molecular weight M n = 1140, weight‐average molecular weight M w = 2590) were obtained with the binary catalyst AlCl 3 /SbCl 3 in toluene at − 15°C ([AlCl 3 ] 0 = 42,5 mmol · L −1 , mole ratio SbCl 3 /AlCl 3 = 0,50). The yield w…
The anomalous dielectric absorption current of BaTiO 3 ceramics when an electric field is applied at above the Curie point was measured. The results cannot be explained by the famous Maxwell-Wagner double layer theory. The total charge of the charging and discharging absorption current was more than 1000 µC/cm 2 . The…
Abstract An improved procedure for the anionic polymerization of hexamethylcyclotrisiloxane (D 3 ) initiated by a monofunctional lithium derivative is reported. The initiator seeding solution is preferably prepared in benzene, and tetrahydrofuran is used as a cosolvent which makes the presence of additional promoters…
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…