Materials Literature
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Abstract The impact fracture mechanisms of rubber‐toughened nylon are analyzed by measuring the energy dissipated in several different processes during notched fracture. An energy balance is thus established for the impact fracture. The stress‐whitened zone is shown to be the energy dissipation zone, having an energy…
Abstract The impact failure of blends of nylon 6,6 and low density polyethylene grafted with maleic anhydride (PEgMA) is discussed in terms of fracture morphology, composition, and particle adhesion and dispersion. Basic criteria for effective impact modification of these materials are developed. A numerical model for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDioxygen and carbonyl binding to iron(II) porphyrins: a comparison of the "picket fence" and "pocket" porphyrinsJames P. Collman, John I. Brauman, Brent L. Iverson, Jonathan L. Sessler, Roger M. Morris, and Quentin H. GibsonCite this: J. Am. Chem. Soc. 1983, 105, 10, 3052–30…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic aspects of the catalytic reduction of dioxygen by cofacial metalloporphyrinsRichard R. Durand Jr., C. Susana Bencosme, James P. Collman, and Fred C. AnsonCite this: J. Am. Chem. Soc. 1983, 105, 9, 2710–2718Publication Date (Print):May 1, 1983Publication History P…
Intima collagen was studied by electron microscopy (rotary shadowing and negative staining) and by analytical ultracentrifugation. It was found that the monomeric unit (Mr 170 000) consists of a 105 nm-long triple helix terminated by a small globular domain (Mr about 30 000) at one end and a large globular domain (Mr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of polystyrene, poly(2,6-dimethyl-1,4-phenylene oxide), and their brominated derivativesRoger P. Kambour, John T. Bendler, and R. C. BoppCite this: Macromolecules 1983, 16, 5, 753–757Publication Date (Print):May 1, 1983Publication History Published online1 May…
Abstract The ozonation products of a common rubber antiozonant, N-(1,3-dimethylbutyl)-N′-phenyl- p -phenylenediamine (HPPD), have been separated by liquid chromatography and identified by mass spectrometry. Three principal mechanisms appear to govern the ozonation of HPPD. Amine oxide formation leads to observed nitro…
Abstract Nickel compounds (NiCl2 and NiCl2(2,2′-bipyridine)) catalyze polycondensation of dihalothiophenes (2,5-dihalothiophenes, 2,4-dibromothiophene, and 3-methyl-2,5-dibromothiophene) by dehalogenation with magnesium to give the corresponding poly(thienylene) type polymers (poly(2,5-thienylene), poly(2,4-thienylene…
The growth of Pseudomonas oleovorans on n-octane was characterized by the formation of intracellular structures. These inclusions were isolated and characterized. Morphologically, they resembled the poly-beta-hydroxybutyrate granules found in Bacillus cereus, as shown by freeze-fracture electron microscopy. The elemen…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal decomposition of barium sulfate-vanadium pentoxide-silica glass mixtures for preparation of sulfur dioxide in sulfur isotope ratio measurementsFumitake. Yanagisawa and Hitoshi. SakaiCite this: Anal. Chem. 1983, 55, 6, 985–987Publication Date (Print):May 1, 1983Public…
The enhancements of normal Raman scattering, resonance Raman scattering, and fluorescence from molecules adsorbed on identical, well-characterized, silver-island films are reported. The enhancement arises from the electromagnetic interaction between the molecules and the electronic plasma resonance of the silver islan…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMorphology and properties of segmented polyether polyurethaneureasCarl B. Wang and S. L. CooperCite this: Macromolecules 1983, 16, 5, 775–786Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 May 1983https://pubs.acs.org/doi…
The contemporary state of the structural chemistry of the hydrides of intermetallic compounds is discussed. X-ray and neutron diffraction data on hydride phases are surveyed and critically analysed. Tetrahedral and octahedral coordination are shown to be most typical for hydrogen atoms in the structures of multi-compo…
Experiments involving competitive and cooperative adsorption of pyridine, ${\mathrm{Cl}}^{\ensuremath{-}}$, SC${\mathrm{N}}^{\ensuremath{-}}$, and Tl, and voltage induced resonance shifting show that the largest surface-enhanced Raman scattering intensity comes from complexes of these species adsorbed on defects which…
A simple empirical relation connects the critical temperature of the order-disorder transition ${T}_{c}$ to the dipolar reorientation rate ${\ensuremath{\tau}}^{\ensuremath{-}1}(T)$ of C${\mathrm{N}}^{\ensuremath{-}}$ molecules by the concept of a critical reorientation rate ${{\ensuremath{\tau}}_{c}}^{\ensuremath{-}1…
A new, semiempirical model of metals and impurities (embedded atom method) makes possible a static treatment of the brittle fracture of a transition metal in the presence of hydrogen. Results indicate that hydrogen can reduce the fracture stress in nickel.
Recent advances in the intercalation of metal complex cations in smectite clay minerals are leading to the development of new classes of selective heterogeneous catalysts. The selectivity of both metal-catalyzed and proton-catalyzed chemical conversions in clay intercalates can often be regulated by controlling surfac…
X-ray diffraction measurements have been made of the wavevector and intensity of satellite diffraction spots as a function of temperature in two examples of crystal B phases. In N-(5-n butyloxybenzylidene)-4-n-heptylaniline (5O.7) a simple sinusoidal layer modulation of fixed wavelength grows in amplitude with decreas…
For pt.II see ibid., vol.15, p.3445 (1982). The authors consider diffusion from a surface y=0 into a solid containing a regular array of d dislocations per unit area, all normal to the surface and each represented as a pipe of radius a within which the diffusion coefficient D' is very much greater than that, D, for di…
Calculations of the electronic structure of WO 3 suggest that the detailed crystallographic arrangement determines rather sensitively the size of the semiconducting energy gap. This increases from 1.6 eV in the perovskite-like cubic approximation to the structure, as used in the only previous study, to 2.4 eV in the f…