Materials Literature
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Cavitation in a liquid is known for its deleterious effects, namely erosion, noise and loss of performance. In a mechanical heart valve, stresses generated by cavitation could lead to catastrophic failure. These deleterious effects are directly connected to the dynamics of pre-existing microscopic nuclei in the liquid…
Dielectric, elastic and piezoelectric measurement was performed on Li 2 B 4 O 7 in the temperature range from 4 K to 900 K. Superionic properties along the c -axis above 400 K were reconfirmed by dielectric measurement. Temperature dependences of the elastic compliance coefficients s 11 and s 22 , the elastic stiffnes…
Abstract A dynamic model of a seeded batch crystallizer is used to investigate the process‐dependent aspects of nucleation and growth kinetic parameter estimation by computer simulation. The satisfactory identification of all parameters in power‐law‐type kinetics with respect to supersaturation requires the use of non…
Although duplex stainless steels (SS) exhibit good performance in many severe corrosive environments, their corrosion resistance can be hampered by precipitation of chromium (Cr)- and molybdenum (Mo)-rich phases during heat treatments. The influence of aging treatments on intergranular corrosion (IGC) of a commercial…
Study of charge trapping and conduction in pure and iodine doped biaxially oriented polypropylene (BOPP) is presented. Structural and chemical modifications induced by iodine were investigated using X-ray, optical and infrared methods. Optical spectra of doped BOPP show absorption at 290 nm from charge transfer comple…
Polypropylene sheet composites were produced by both the melt consoli dation and slurry deposition processes. The resulting composites had comparable flexural properties, based on the efficiency of the glass fiber reinforcement, but dissimilar impact strengths. The impact strength of the composites was found to be rel…
The classical method of integral equations was applied to determine the electrostatic field distribution on an insulator coated with a thin homogeneous surface layer. Results of calculations of the electric potential and the electric field on both uniformly and nonuniformly polluted model insulators coated with layers…
Polymer distribution in rigid PU foams is a complex, position de pendent parameter which can be described in terms of: 1) the overall density and density distribution, 2) the average cellsize and cellsize distribution, 3) cell elonga tion and orientation and 4) the material distribution between struts and windows with…
A grain rotation model first described by Jeffery is applied to quantitatively predict texture development and texture heterogeneity in hot‐worked β‐Si 3 . Comparison of model predictions and experimental results indicates that such models can successfully priedict the texture developed in β‐Si 3 N 4 with significant…
The Hall effect of the quasi-one-dimensional compound ${\mathrm{Tl}}_{2}$${\mathrm{Mo}}_{6}$${\mathrm{Se}}_{6}$ undergoes a progressive transition between an electronlike metallic regime at 300 K and a holelike semimetallic regime just above the superconducting transition (${\mathit{T}}_{\mathit{c}}$\ensuremath{\appro…
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…