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The later-stage spinodal decomposition (SD) of polymer mixtures at deep quenches were investigated by time-resolved light scattering. The scaled structure factor F(x)≡qm (t,T)3I(x) with x≡q/qm (t,T) was analyzed as a function of time t or reduced time τ during the SD at various temperatures T’s, where qm (t,T) is the…
The feasibility of making multilayer optical filters using polymerized solgel solutions was demonstrated. Theoretical modeling was done to determine the expected optical response of multilayer coatings with various index profiles to select a coating design which was achievable using current technology and which would…
Abstract Stable, three-dimensionally ordered complexes were formed from synthetically hydrated, highly ordered kaolinite (d(001) = 8.4 Å) and several organic compounds. Removal of the intercalated organic compound by drying or by water washing recovered the 8.4-Å hydrate with its ordered layer stacking essentially unc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular encapsulation of transition-metal complexes in cyclodextrins. 1. Synthesis and x-ray crystal structure of [(.eta.5-C5H5)Fe(.eta.6-C6H6)]PF6.cntdot.2.alpha.-CD.cntdot.8H2OBernd Klingert and Grety RihsCite this: Organometallics 1990, 9, 4, 1135–1141Publication Date (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-resolution solid-state carbon-13 nuclear magnetic resonance study of polybenzimidazole/polyimide blendsJanusz Grobelny, David M. Rice, Frank E. Karasz, and William J. MacKnightCite this: Macromolecules 1990, 23, 8, 2139–2144Publication Date (Print):April 1, 1990Publicat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT.pi.-Bonding in four-coordinate aluminum aryloxide compoundsMatthew D. Healy, Joseph W. Ziller, and Andrew R. BarronCite this: J. Am. Chem. Soc. 1990, 112, 8, 2949–2954Publication Date (Print):April 1, 1990Publication History Published online1 May 2002Published inissue 1 Apr…
Glasses having the composition (AgI${)}_{\mathit{x}}$-(${\mathrm{Ag}}_{2}$O-n${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$, where x is in the range from 0 to 0.7 and n is either 1 or 2, have conductivities as high as ${10}^{\mathrm{\ensuremath{-}}2}$ S/cm at room temperature. NMR line-…
Tetraarylporphyrins substituted with nitro groups at beta-pyrrolic positions are potential candidates for electron-accepting pigments in model systems for photosynthesis. The photophysics of 2-nitro-5,10,15,20-tetra-p-tolylporphyrin and its zinc analog have been studied in order to evaluate this potential. The ground…
Several new classes of low polarity, low viscosity and optically weakly anisotropic two and three ring fluorinated liquid crystals with alkenyl side chains are presented. Synergisms which lead to a number of favourable material properties are shown to result from systematic changes of (a) para and lateral fluorination…
Abstract The effect of mixing intensity (power input) on the precipitation/crystallization of barium sulfate in a two‐feedstream (sodium sulfate, barium chloride) continuous stirred‐tank crystallizer with mixed product removal was investigated through experiments and companion mathematical models. Crystal growth rate…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of formation and dissociation of the 1,4,7-triazacyclononane-N,N',N"-triacetate complexes of cerium(III), gadolinium(III), and erbium(III) ionsErno Brucher and A. Dean SherryCite this: Inorg. Chem. 1990, 29, 8, 1555–1559Publication Date (Print):April 1, 1990Publicat…
The structural phases of sodium-doped polyparaphenylene vinylene have been investigated by in situ x-ray-diffraction methods using oriented polymer samples. Complete doping is achieved and, at doping concentrations of approximately 55% per mole weight of sodium, a crystalline hexagonal phase is found. This phase is ch…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe interplay between geometric and electronic structures in polyisothianaphthene, polyisonaphthothiophene, polythieno(3,4-b)pyrazine, and polythieno(3,4-b)quinoxalineKasinath Nayak and Dennis S. MarynickCite this: Macromolecules 1990, 23, 8, 2237–2245Publication Date (Print…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of lithium niobium ethoxide (LiNb(OCH2CH3)6: a precursor for lithium niobate ceramicsDennis J. Eichorst, Kevin E. Howard, David A. Payne, and Scott R. WilsonCite this: Inorg. Chem. 1990, 29, 8, 1458–1459Publication Date (Print):April 1, 1990Publication Hist…
Ultraviolet photoelectron spectroscopy (UPS) has been applied to the investigation of the electronic structure of oligothiophenes with 4–8 thiophene rings. In a series of α-linked oligomers (αn with n being the number of rings), a systematic evolution of the π band is observed. Several peaks which correspond to the π…
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Thermally stimulated polarization and depolarization current (TSPC/TSDC) measurements were made on lead halide silicate glasses having compositions (65 − x )PbO· x PbX 2 ·35SiO 2 where x = 0, 0.1, 2, 10 and X = F, CI, Br, and I. The addition of halogen ions to lead silicate glasses gives rise to a new high‐temperature…
Equilibrium constants are reported for reaction of Lewis bases, including H2O, with ( thf )( tpp ) CrOFe ( salmah ) in tetrahydrofuran and toluene solutions [ tpp = dianion of 5,10,15,20- tetraphenylporphyrin ; salmah = dianion of N,N?-(4-methyl-4-azaheptane-1,7-diyl) bis ( salicyli - deneimine )]. Mossbauer spectra o…
It is shown that high‐quality IR specular reflectance spectra can be obtained from polished surfaces of dense ceramics. The reflectance spectra can be deconvoluted by the Kramers‐Kronig transformation to yield absorption spectra or the real and imaginary parts of the dielectric function. IR line shapes and peak wavenu…
Disordered crystals show excess absorption in the far infrared and millimetre range in addition to one- and multi-phonon absorption processes. The effect is investigated in non–ferroelectric order-disorder systems (KSCN, NH4Br:) and in weakly disordered and modulated improper and pseudoproper ferroelectrics ((NH4)2SO4…