Materials Literature
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We report a detailed experimental study of a model hard-sphere colloid plus nonadsorbing polymer mixture in which the depletion effect causes phase separation. The key parameter that determines the topology of the phase diagram is the ratio \ensuremath{\xi}=${\mathit{r}}_{\mathit{g}}$/a of the radius of gyration (${\m…
Lactic acid has been an intermediate-volume specialty chemical (world production ∼ 40,000 tons/yr) used in a wide range of food processing and industrial applications. Lactic acid has the potential of becoming a very large volume, commodity-chemical intermediate produced from renewable carbohydrates for use as feedsto…
The XABS2 Fortran program calculates an empirical absorption correction based on minimization of the 2 differences between F2obs and F2calc. The basic algorithm has been used in the crystallography laboratory at the University of California, Davis for over a decade, in the form of the program XABS. XABS relied upon an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBasic Properties of Mg2+1-xAl3+x Layered Double Hydroxides Intercalated by Carbonate, Hydroxide, Chloride, and Sulfate AnionsVera R. L. Constantino and Thomas J. PinnavaiaCite this: Inorg. Chem. 1995, 34, 4, 883–892Publication Date (Print):February 1, 1995Publication History…
Simple scaling analysis of temperature- and stress-dependent viscosity convection with free-slip boundaries suggests three convective regimes: the small viscosity contrast regime which is similar to convection in a fluid whose viscosity does not depend on temperature, the transitional regime characterized by self-cont…
Other| February 01, 1995 Crystal chemistry of the monazite and xenotime structures Yunxiang Ni; Yunxiang Ni Miami University, Department of Geology, Oxford, OH, United States Search for other works by this author on: GSW Google Scholar John M. Hughes; John M. Hughes Search for other works by this author on: GSW Google…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemplate Synthesis of Electronically Conductive Polymer NanostructuresCharles R. MartinCite this: Acc. Chem. Res. 1995, 28, 2, 61–68Publication Date (Print):February 1, 1995Publication History Published online1 May 2002Published inissue 1 February 1995https://doi.org/10.1021…
A universal constitutive equation between the heat flux vector and the temperature gradient is proposed to cover the fundamental behaviors of diffusion (macroscopic in both space and time), wave (macroscopic in space but microscopic in time), phonon–electron interactions (microscopic in both space and time), and pure…
The structure of intermediate surface compounds in heterogeneous catalytic reactions involving H2, CO, and NO is discussed. The relative reliability of the role of various structures in catalysis is discussed. Schemes for the reaction mechanism which have been developed from information on the surface complexes are de…
Crystallographic and dispersion characteristics of mica at high (V—XI) reflection orders were investigated for the first time. Even the order-XI integral reflection was sufficiently strong to be used in experiments. High-precision bending of a mica crystal along a spherical surface with a small radius R = 100 mm and t…
Abstract We studied the late‐stage spinodal decomposition of the polystyrene–cyclohexanol system in relation to membrane formation. Phase separation was effected by the removal of thermal energy from the homogeneous polymer solution. The ultimate morphology of the phase‐separated systems has been studied using electro…
Abstract One of the main obstacles to the wider application of chitin in polymeric materials is its poor tractability due to unfavorable solubility properties. The solubility can be enhanced by introducing bulky acyl residues into the polymer (as in butyrylchitin and valeroylchitin). However, if modification is carrie…
Abstract The fractionation of polydimethylsiloxane (PDMS) using supercritical CO 2 was studied to determine the parameters of pressure and temperature required to separate specific molecular weights. On a laboratory scale, we show that this fractionation method can quickly provide gram quantities of the polymer with a…
Abstract The effect of Sb 2 O 3 , which is used as the main catalyst in the production of poly(ethylene terephthalate) (PET) by melt polymerization, was studied on solid‐state postpolycondensation. It was observed that the catalyst works efficiently even in the solid state. The number‐average molecular weight of a PET…
Abstract Polychloroprene and compounds of polychloroprene with ZnO and MgO were crosslinked by heating in a DSC at a programmed rate. The reaction was stopped at points along the thermogram and the crosslink density of the compound determined. The amount of chlorine evolved during reaction was measured as ZnCl 2 and/o…
Abstract The injection molding of an isotactic polypropylene was computer‐simulated with both quiescent and shear‐induced crystallization taken into account. A one‐dimensional finite difference model was used to simulate the filling, packing, and cooling stages of the injection‐molding cycle. The Spencer‐Gilmore equat…
Abstract Various material data for an isotactic polypropylene were acquired for the simulation of the injection molding of this material. Viscosity as a function of shear rate and temperature was measured using a capillary rheometer at high shear rates and a cone‐and‐plate rheometer at low shear rates. Heat‐flow prope…
Results of recent density functional theory calculations for alkali metal adsorbates on close-packed metal surfaces are discussed. Single adatoms on the (111) surface of Al and Cu are studied with the self-consistent surface Green-function method by which the pure adsorbate-substrate interaction may be analyzed. Highe…
Abstract A study was undertaken of the effect of sample preparation conditions, especially moisture content, annealing conditions, and degree of neutralization, on the dynamic mechanical properties of poly(styrene‐ co ‐sodium methacrylate) ionomers. Water plasticizes the ionic cores; however, very small amounts of wat…
Abstract Two stereoregular polygluconamides, one ( 3 ) of polypeptide‐type and the other ( 16 ) being a polycaproamide containing four stereocenters in the main chain of the repeating unit, have been prepared from D‐glucosamine and D‐glucose, respectively. The new polyamides were characterized by elemental analysis, a…