Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPillared clays as superior catalysts for selective catalytic reduction of nitric oxide with ammoniaR. T. Yang, J. P. Chen, E. S. Kikkinides, L. S. Cheng, and J. E. CichanowiczCite this: Ind. Eng. Chem. Res. 1992, 31, 6, 1440–1445Publication Date (Print):June 1, 1992Publicati…
Abstract The characteristic ratio C ∞ and the entanglement molecular weight M e are two key molecular parameters that control melt viscoelasticity, solid mechanical (brittle/ductile) behavior, and adhesion of polymers. We show that the characteristic ratio C ∞ and the entanglement molecular weight M e can be predicted…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSquaraine chemistry. Synthesis, characterization, and optical properties of a class of novel unsymmetrical squaraines: [4-(dimethylamino)phenyl](4'-methoxyphenyl)squaraine and its derivativesKock Yee Law and F. Court BaileyCite this: J. Org. Chem. 1992, 57, 12, 3278–3286Publ…
The reaction between SiC and SiO 2 has been studied in the temperature range 1400–1600 K. A Knudsen cell in conjunction with a vacuum microbalance and a high‐temperature mass spectrometer was used for this study. Two systems were studied—1:1 SiC (2 wt% excess carbon) and SiO 2 ; and 1:1:1 SiC, carbon, and SiO 2 . In b…
Finite element calculations have been carried out for spherical unit cells containing a concentric spherical hole to characterize the power law creep of a material containing voids. Axisymmetric states of macroscopic stress were applied to the unit cells ranging from purely hydrostatic loading to purely deviatoric str…
Abstract The melting behavior of poly(butylene terephthalate) (PBT) has been investigated, and a simulation has been performed to determine whether the multiple melting endotherms observed during the thermal analysis of PBT can be explained by the simultaneous melting and recrystallization of an initial distribution o…
We develop here an empirical procedure for constructing embedded-atom-method (EAM) interatomic potentials for hcp metals. This is based on fitting perfect-crystal lattice properties. The contribution of the lattice inner degrees of freedom, due to the two atoms per lattice site, is included into the elastic response o…
Room temperature vulcanizing (RTV) silicone rubber coatings are applied to electrical insulators to improve their subsequent insulation strength, particularly under wet conditions. Under prolonged wetting the hydrophobicity of the coating is reduced temporarily and the insulator protection is lost. After a dry period,…
The structure and function of the xylose (glucose) isomerase from Actinoplanes missouriensis have been analyzed by X-ray crystallography and site-directed mutagenesis after cloning and overexpression in Escherichia coli. The crystal structure of wild-type enzyme has been refined to an R factor of 15.2% against diffrac…
The spreading of a drop of viscous fluid on a horizontal surface by capillarity has been studied by a number of authors. Different hypotheses have been advanced for the crucial questions of the contact angle at the moving rim of the drop. It is argued that there is one model that agrees with experiments and is economi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyimides derived from 2,2'-bis(trifluoromethyl)-4,4'-diaminobiphenyl. 2. Synthesis and characterization of polyimides prepared from fluorinated benzenetetracarboxylic dianhydridesTohru Matsuura, Maki Ishizawa, Yoshinori Hasuda, and Shiro NishiCite this: Macromolecules 1992…
Artificial substrata are increasingly used to study periphyton, but their ability to reproduce natural substrata remains controversial. Although many studies have made contemporaneous comparisons of periphyton assemblages on artificial and natural substrata at one or a few sites, no broadly based comparison exists. We…
Raman scattering of ${\mathrm{B}}_{2}$${\mathrm{O}}_{3}$ has been performed from room temperature to 1273 K to study structural changes as the glass transforms into the melt via the supercooled regime. It is found that a structural model containing threefold six-member planar boroxol rings and chains of ${\mathrm{BO}}…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNickel(II) ion-support interactions as a function of preparation method of silica-supported nickel materialsOlivier Clause, Maggy Kermarec, Laurent Bonneviot, Francois Villain, and Michel CheCite this: J. Am. Chem. Soc. 1992, 114, 12, 4709–4717Publication Date (Print):June 1…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLyotropic liquid crystalline hyperbranched aromatic polyamidesYoung H. KimCite this: J. Am. Chem. Soc. 1992, 114, 12, 4947–4948Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/doi/10.1021/ja0…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, characterization, and properties of poly(N-alkylanilines)Jean Wilbert Chevalier, Jean Yves Bergeron, and Le H. DaoCite this: Macromolecules 1992, 25, 13, 3325–3331Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal properties and orientational behavior of a liquid-crystalline ion complex polymerSeiji Ujiie and Kazuyoshi IimuraCite this: Macromolecules 1992, 25, 12, 3174–3178Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 Ju…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCylindrical micelles in rigid-flexible diblock copolymersD. R. M. Williams and G. H. FredricksonCite this: Macromolecules 1992, 25, 13, 3561–3568Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://doi.org/10…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPentacoordinate anionic bis(siliconates) containing a fluorine bridge between two silicon atoms. Synthesis, solid-state structures, and dynamic behavior in solutionKohei Tamao, Takashi Hayashi, Yoshihiko Ito, and Motoo ShiroCite this: Organometallics 1992, 11, 6, 2099–2114Pu…
A mathematical model is presented that investigates the diffusive reequilibratrion of chemical species in melt inclusions with external melt through the host crystal. Analytic solution of the differential equations reveals that reequilibration is easier (1) for species with higher diffusivities in the host crystal, (2…