2 edition of Radiotracer studies of diffusion through polymer films found in the catalog.
Radiotracer studies of diffusion through polymer films
Thesis (M.Sc) - University of Birmingham, School of Chemistry, 1992.
|Statement||by Jerome Bera.|
Moisture diffusion in thin polymer films is of special interest to a wide range of industrial sectors, including membrane technologies and packaging materials. Method. Diffusion equations first utilized by Crank and Park are used to compute the diffusion constants for the thin films . Get print book. No eBook available. ; Barnes&; Read, highlight, and take notes, across web, tablet, and phone. Go to Google Play Now» Diffusion in Polymers. John Crank. Academic Press, - Diffusion - pages. 0 Reviews. What people are saying - Write a review. We haven't found any reviews in the usual places.
One type of diffusion, is one where we're looking at a particular polymer that is diffusing through a solution. So here is an example of this polymer chain and what we're going to look at is this structure is a coiled structure, and it's coiled because of entropic effects. Print book: EnglishView all Emphasizing the importance of fundamental studies throughout, Diffusion in Polymers considers the statistical mechanics of polymers membrane architectures introduces the study of melts discusses polymer molecules of unusual shapes analyzes the diffusion of one polymer in another and more.\/span>\"@ en.
Estimated and Experimental Diffusion Coefficient for Ar, O 2, N 2, CO, and CH 4 in amorphous cis-PBDa a Units of Diffusion Coefficients, D ( cm2/s). fig. 3 Arrhenius plot of the diffusion coefficients of methane and second order polynomial fit. Crosses and line fit, this work; circles.3 fig. 1. Density variation as a function of polymer. solution semi-dilute or concentrated; under those conditions diffusion of solvent as well as polymer is adequately described by the free-volume theory (see below). In higher-M polymers the most general case is that of ternary systems, in which monodisperse linear molecules of mass M diffuse through a host consisting of a fully.
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Radiotracer self-diffusion measurements have been made for norbornane (bicyclo[2,2,1]heptane) and norbornylene (bicyclo[2,2,1]heptene) in their h.c.p. plastic crystalline phases. In the case of norbornane the measurements were limited by the poor quality of the Cited by: 8.
Diffusion of organic molecules through epoxy/acrylic copolymer films. European Polymer Journal32 (5), DOI: /(95)Cited by: The amount of radon passing through a unit area of film per unit time is proportional to the thickness of the film and the diffision coefficient.
The amount of radioactivity detected is automatically recorded by a computer. DESIGN GOAL This project developed and evaluated a method to measure the diffusion of radon through thin polymer films.
Diffusion-out experiments Diffusion-out experiments are those in which the additive is allowed to diffuse from an initially uniform concentration in a polymer film into a contacting, additive-free medium.
Polymer films were prepared by compression moulding of power which had been impregnated with the u.v. stabilizer from by: Diffusion profiles of the radiotracer atoms in the polymer films Figure Cross-sectional TEM micrographs showing the striking differences in the copper diffusion characteristics between Cu deposition at room temperature (8 nm at nm/min.) followed by subsequent annealing at °C for 30 min.
(top) and very slow evaporation of Cu (4 nm Cited by: 8. Studies were performed to investigate the effect of curing on the diffusion coefficients of water, as measured via the sorption technique, in acrylate polymeric films. Garth Spencer and I. Ibrahim, Diffusion coefficients in water vapor–poly(vinyl alcohol) systems.
Application of sorption‐rate and multifilm‐permeation methods, Journal of Polymer Science Part A Polymer Physics, 6, 12, (), (). For more than 30 years, Polymer Engineering & Science has been one of the most highly regarded journals in the field, serving as a forum for authors of treatises on the cutting edge of polymer.
GCH Polymer – Diffusion PM Wood-Adams 15 Permselectivity of polymer membranes and gas separations If the permeabilities of 2 gases in one polymer are different then this polymer may be used to separate the gases to some extent.
This is property of the polymer described by the gas selectivity, α A/B. B A A B P P α. Examines various aspects of diffusion in polymers that are being quantitatively described and engineered--detailing the phenomenology of diffusion and outlining areas for future research.
Emphasizing the importance of fundamental studies throughout. C.M. Balik, W.H. Simendinger, An attenuated total reflectance cell for analysis of small molecule diffusion in polymer thin films with Fourier-transform infrared spectroscopy, Polymer, /S(97), 39, 20, (), ().
The first chapter introduces the basic techniques of measurement and computation. Subsequent chapters deal with the diffusion of gases and vapor including influence of inhomogeneities in the medium, followed by a chapter addressing measurement of polymer solution rates and application of diffusion Reviews: 1.
Fesia Lestari Laksmana, Paul Jean Antoine Hartman Kok, Herman Vromans, Kees Van der Voort Maarschalk, Predicting the diffusion coefficient of water vapor through glassy HPMC films at different environmental conditions using the free volume additivity approach, European Journal of Pharmaceutical Sciences, /, 37, 5, ( Energy Transfer Studies of Polymer Diffusion 29 Polymer Diffusion in P(BAMMA39) Films at Different Temperatures 31 Polymer Diffusion in Different Composition P(BA-MMA) Films 35 Temperature Dependence of the Viscoelastic.
Molecular diffusion in polymeric systems J. Duda Chemical Engineering Department, The Pennsylvania State University, University Park, PAU.S.A. Abstract - Molecular diffusion of polymer chains and low molecular weight constituents and impurities can be an important process in the formation and application of polymer composites.
Diffusion at the polymer/polymer interface was probed by small-amplitude oscillatory shear measurements carried out on polystyrene (PS)/polystyrene (PS) sandwich-like assembly as a function of the time of welding in the molten state. It was found that the dynamic complex shear modulus G*(t) at a fixed frequency increases with the time of contact in two time regimes.
Physical Picture for Diffusion of Polymers • Low Molecular Weight (M M e) • Entanglements in a polymer melt (a short portion of one chain is outlined in bold). The Case II diffusion is the second most impo rtant mechanism of diffusion for the polymer.
This is a process of moving boundaries and a linear sorption kinetics, which is opposed to Fickian. Wedescribe energy transfer (ET)measurements to follow polymer diffusion, as well as oscillatory dynamic mechanical measurements and tensile measurements, on films prepared from structured and unstructured latex particles consisting of a copolymer of butyl methacrylate and butyl acrylate with a Tg of 20°C.
Structure was introduced in the form of a low level (1 mol%) of crosslinking, using. The Use of Radiotracer Diffusion to Investigate Ionic Transport in Polymer Electrolytes: Examples, Effects, and Their Evaluation Stolwijk, N. / Wiencierz, M.
Gradient Driven Diffusion through Polymers Molecular Diffusion in Resist Polymer Films a Chain Diffusion in Dense Polymer Systems a Solvent-Polymer Interdiffusion - Fickian Diffusion. a Effect of Bending and Torsion Rigidity on Self-Diffusion in Polymer Melts.
Materials Science Diffusion Problem that considers the flux of a chemical through a polymer film. It assumes a linear gradient.The review deals specifically with liquid transport into and through polymer matrices.
It attempts to point out the accuracy of experimental observations and the ability of different theories to explain them. Most often the rates of diffusion (or time dependence of diffusion distance) are measured.
The results are usually interpreted using Fick.