Materials Literature
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Among the vinyl monomers, acrylonitrile is the only monomer used for the production of synthetic fibers. Other vinyl monomers lack cohesive forces between the molecular chains of their polymers and, hence, can not compete with acrylonitrile [1]. Acrylic fiber has replaced wool in many major applications, particularly…
The metastable chiral smectic C phases of the compounds have been made technically useful by alloying to different two- and three-component systems with enantiotropic behaviour. These systems can serve as a base for multi-component systems of higher order for optimizing various properties. In a similar way, the inconv…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtection and polymerization of functional monomers. 10. Synthesis of well-defined poly(4-vinylbenzaldehyde) by the anionic living polymerization of N-[(4-ethenylphenyl)methylene]cyclohexamineAkira Hirao and Seiichi NakahamaCite this: Macromolecules 1987, 20, 12, 2968–2972P…
Oxycarbide glasses in the Mg‐Al‐Si‐O‐C system and oxynitride glasses in the Mg‐Al‐Si‐O‐N system were synthesized by conventional melting techniques, chemically analyzed, and evaluated for selected mechanical properties as a function of carbon or nitrogen content. Both glass systems exhibited increases in density, Youn…
Abstract The combustion activities of various oxide catalysts were investigated using BaO·6Al2O3 as support. Conventional impregnation of oxide catalysts only lead to a decrease in surface area of the support. Cation-substituted barium hexaaluminates generally retained the large surface area. In particular, BaMnAl11O1…
Important cellular characteristics, including selective adhesion, growth rate, motility, and differentiation, are controlled, in part, by signals received at the cell surface. The molecular mechanisms for the cell surface control of these cell behaviors are largely unknown. In order to probe the role of specific extra…
Abstract Diffraction patterns of oriented blends of isotactic polypropylene (iPP) and polyethylene (PE) published recently by several authors are analyzed on the basis of a unique epitaxial relationship between the iPP and PE crystal lattices. The contact planes are (100) PE and (010) iPP , and the PE chains lie at 50…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and crystal structures of (Te2Se8)(AsF6)2, (Te4.5Se5.5)(AsF6)2, and (Te2Se6)(Te2Se8)(AsF6)4(SO2)2Michael J. Collins, Ronald J. Gillespie, and Jeffery F. SawyerCite this: Inorg. Chem. 1987, 26, 10, 1476–1481Publication Date (Print):May 1, 1987Publication History P…
Formation of a bienzyme complex of pig heart mitochondrial malate dehydrogenase and citrate synthase in a buffered system is demonstrated by means of a covalently attached fluorescent probe to citrate synthase. Assuming 1:1 stoichiometry of the enzymes in the complex, an apparent dissociation constant of 10(-6) M was…
Using an assay based on polypeptide mobility in one- and two-dimensional polyacrylamide electropherograms, we purified the Salmonella typhimurium cysB protein from an Escherichia coli strain carrying plasmid pGBK14, in which the S. typhimurium cysB gene is under transcriptional control of the strong promoter PL from p…
Abstract A novel heteropolytungstate salt [(CH3)4N]6[H3BiW18O60] is prepared and its crystal structure is determined : monoclinic, P21/c, a=13.986(7) Å, b=15,134(2), c=23.250(8), β=115.32(3)°, Z=2. The anion has the same framework as that found in 18-tungstoarsenate(III)(AsW18O60). The Bi atom is coordinated by three…
A method for evaluating stresses in coatings on brittle substrates by indentation is described. The basis for evaluations is fracture mechanics model of the radial crack system in the Vickers geometary, incorpeorating the effects of a thin surface demonstrate the methodology. The crack size on these coated specimens a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of thermal decomposition of nylon 66Alberto Ballistreri, Domenico Garozzo, Mario Giuffrida, and Giorgio MontaudoCite this: Macromolecules 1987, 20, 12, 2991–2997Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 Ma…
Absorption and scattering losses of visible radiation in nematic liquid crystals (LCs) were measured by an improved transmission technique. The absorption loss of the E-7 LC mixture was found to be ~1 order of magnitude larger than the scattering in the isotropic state. On the contrary, light scattering surpasses abso…
Benzo[a]pyrene-7,8-diol-9,10 epoxide (BPDE)-DNA adducts have been analyzed by surface-enhanced Raman scattering (SERS) spectrometry. BPDE is the ultimate carcinogenic metabolite of benzo[a]pyrene. The SERS measurements were performed with the use of a silver-coated cellulose material as the SERS-active substrate. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of morphology on the transport of gases in block copolymersDavid J. Kinning, Edwin L. Thomas, and Julio M. OttinoCite this: Macromolecules 1987, 20, 5, 1129–1133Publication Date (Print):May 1, 1987Publication History Published online1 May 2002Published inissue 1 May 1…
We now report the results of kinetic and trapping experiments performed in acetylene/benzene and acetylene/toluene mixtures above 820 K by modulated beam dynamic mass spectrometry which provide direct evidence of vinylidene participation in chemical reactions. Under such conditions the fast equilibrium \nHC=CH ⇌…
Measurements were made of the enthalpy changes, using sorption isotherms, and of the changes in dielectric response of microcrystalline cellulose discs when different amounts of water were added. The results are explained by means of a molecular model in which the water is sorbed in a step-wise process of hydrogen bon…
Abstract In summary, the solid-state C-13 NMR technique has proven to be a significant method for the detection of crosslinks and other structural modifications in sulfur-vulcanized NR systems. The use of sulfur as a crosslinking agent by itself generates a considerable amount of main-chain structural modifications. C…
Abstract The pore-size and particle-size distributions as well as the surface areas of Cs3PW12O40 and Cs3PMo12O40 have been determined by N2 adsorption and electron micrograph. It was first demonstrated by the quantitative comparison of these data that their micro-and/ or mesopores which gave these compounds very high…