Materials Literature
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The Cahn-Hilliard system, a natural extension of the single Cahn-Hilliard equation in the case of multicomponent alloys, will be shown to generate a dissipative semigroup on the phase space ℋ = [ H 2 (Ω)] m . Following Hale's ideas and based on the existence and form of the Lyapunov functional, our main result will be…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric Relaxation Studies of Annealed Short Side Chain Perfluorosulfonate IonomersShunfua Su and Kenneth A. MauritzCite this: Macromolecules 1994, 27, 8, 2079–2086Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 Apri…
Abstract This paper presents the development of a model for free radical initiated polypropylene degradation during reactive extrusion that combines a kinetic model of the polypropylene degradation reaction with a simplified model of the melting mechanism in the extruder. The free radical initiated degradation of poly…
Abstract In this paper we address the aspects associated with shear modification of low density polyethylene by extrusion. By successive passes of the polymer through an extruder it can be shown that both the melt viscosity and melt elasticity are reduced by shear modification. These reversible variations are not acco…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-Phase Ion Chemistry of Boron Hydride AnionsMichele Krempp, Robert Damrauer, Charles H. DePuy, and Yeghis KeheyanCite this: J. Am. Chem. Soc. 1994, 116, 8, 3629–3630Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 Apr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTelechelic Polymers between Two Impenetrable Adsorbing SurfacesSanjay Misra and Wayne L. MatticeCite this: Macromolecules 1994, 27, 8, 2058–2065Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 April 1994https://pubs.acs.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalorimetric Investigation of an Exothermic Reaction: kinetic and Heat Flow ModelingRalph N. Landau, Donna G. Blackmond, and Hsien-Hsin TungCite this: Ind. Eng. Chem. Res. 1994, 33, 4, 814–820Publication Date (Print):April 1, 1994Publication History Published online1 May 200…
The construction, operation, and potential scope of application of a simple electrochemical cell that can be used to synthesize polyalanine and exhibit its electrochromic properties.
Abstract The Raman spectra of diethylenetriammonium chlorocadmate [(denH 3 )CdCl 5 ] single crystals were studied in the Raman shift range from 250 to 500 cm −1 for temperatures between 10 and 428 K. A phase transition at T c = 168 K was observed and characterized. In particular, two Raman bands were sensitive to temp…
A series of tetra(hydroxyphenyl)-(2-, 3- and 4-hydroxy; THPP) and tetrakis(dihydroxyphenyl)porphyrins (2,3-, 2,4-, 2,5-, 3,4-, and 3.5-dihydroxy; TDHPP) was synthesized and tested for toxicity in HeLa cells and human melanoma cell lines. Irradiation of drug-treated cells with > 600 nm light greatly increased the toxic…
In order to develop reduced-activation ferritic/martensitic steels potentially suitable for fusion reactor applications, the effect of principal alloying elements Cr, W and V on the micro- structural evolution, toughness and high-temperature creep strength was systematically investigated for relatively simple Cr-W-V s…
Identification of critical values for soil tests is a fundamental step in using soil testing to guide fertilization. Critical values usually are selected to attain a desired percentage of maximum yield. Here we demonstrate how critical values can be selected to maximize profits. Twenty‐eight response trials with corn…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic Studies of Manganese Oxide Octahedral Molecular Sieves: A New Class of Spin GlassesSteven L. Suib and Lennox E. ItonCite this: Chem. Mater. 1994, 6, 4, 429–433Publication Date (Print):April 1, 1994Publication History Published online1 May 2002Published inissue 1 Apr…
ABSTRACT The Greater Yellowstone Area ecosystem experienced major wildfires in 1988, resulting in a substantial number of catchments being burned. We studied diatom assemblage structure at 14 sites over 5 years in catchments ranging from 0 to over 90% burned. Coefficients of variation for selected physical measures pr…
Abstract The sequential reaction of selected polycyclic aromatic hydrocarbons with butyllithium/TMEDA/hexane and sulfur allows preparation of ring‐fused dithiins, dithioles, and thiophenes. In this manner, phenanthrene has been converted to phenanthro[4,5‐cde][1,2]dithiin and phenanthro[1,10cd]‐1,2‐dithiole. Yellow cr…
The geometric moisture diffusivity model developed by this research indicates that fiber volume fraction and shape coefficient are the most important structural parameters affecting water vapor diffusivity through nonhydrophilic nonwoven fabrics. Water vapor diffusivity decreases with increasing fiber volume fraction…
Abstract The thermal degradation processes which occur in poly(ether‐sulfone) (PES) and poly(phenylene oxide) (PPO) have been studied by Direct Pyrolysis‐Mass Spectrometry (DPMS). The pyrolysis mass spectra of PES and PPO contain molecular ions up to m/z 700, corresponding to pyrolysis compounds of sufficient size to…
Abstract The reaction between 4,5( E )‐epoxy‐2( E )‐heptenal (EH) and l ‐lysine was studied to characterize some of the compounds that may be produced when proteins react with peroxidizing lipids. A mixture of EH and lysine was incubated overnight at room temperature and then fractionated by high‐performance liquid ch…
Results of X-ray and ellipsometric studies on self-assembled monolayer films of three fluorinated chlorosilanes are presented. By inferring an index of refraction, the monolayer thicknesses obtained from both these types of studies are self-consistent. The tilt of the molecules with respect to the layer normal is foun…
The gas phase thermal decomposition rates of the C1 and C2-substituted peroxyacyl nitrates (RC(O)OONO2), PAN (R = CH3), PPN (R = C2H5) and vinyl-PAN (R = CH2 = CH-) have been measured at ambient temperature (288 - 299 K) and 1 atm. of air. Our results for PAN (k = A exp (-Ea/RT), log10 (A, s-1) = 16.2 ± 1.6, Ea = 26.9…