Determination of Concentration-Dependent Diffusion Coefficients in Polymer–Solvent Systems: Analysis of Concentration Profiles Measured by Raman Spectroscopy during Single Drying Experiments Excluding Boundary Conditions and Phase Equilibrium

2015 ◽  
Vol 48 (23) ◽  
pp. 8608-8614 ◽  
Author(s):  
David Siebel ◽  
Philip Scharfer ◽  
Wilhelm Schabel
Keyword(s):  
Raman Spectroscopy ◽  
Phase Equilibrium ◽  
Boundary Conditions ◽  
Systems Analysis ◽  
Diffusion Coefficients ◽  
Concentration Profiles ◽  
Solvent Systems ◽  
Polymer Solvent

scholarly journals Determination of Binary Interaction Parameters for Ternary Polymer–Polymer–Solvent Systems Using Raman Spectroscopy

2020 ◽  
pp. 2000149
Author(s):  
Víctor‐Alfonso Gracia‐Medrano‐Bravo ◽  
Lisa Merklein ◽  
Nikolas Oberle ◽  
Manuel Batora ◽  
Philip Scharfer ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Interaction Parameters ◽  
Binary Interaction ◽  
Binary Interaction Parameters ◽  
Solvent Systems ◽  
Ternary Polymer ◽  
Polymer Solvent

scholarly journals Migration of mineral oil in elastomers

2021 ◽  
Author(s):  
Tobias Förster ◽  
Artur Blivernitz
Keyword(s):  
Diffusion Coefficients ◽  
Mineral Oil ◽  
Activation Energies ◽  
Concentration Profiles ◽  
Small Reservoir ◽  
Experimental Procedure ◽  
Mineral Oils ◽  
The Absolute ◽  
Suitable Measure

AbstractThis work describes a newly introduced experimental procedure to quantify the diffusion progress of mineral oils locally resolved in NBR. Diffusion of reference oils IRM 901, IRM 902 and IRM 903 in NBR with various acrylonitrile contents was investigated. Classical sorption experiments were performed as a basic characterization and compared to the newly introduced method. Here, elastomer specimens are only being dipped with the bottom in a relatively small reservoir of mineral oil. This provides a determination of locally resolved concentration profiles of mineral oils, and the calculation of diffusion coefficients. These diffusion coefficients follow the same trends like those determined via sorption experiments. Despite differences in the absolute numbers, activation energies of diffusion can be applied as a suitable measure for the compatibility of elastomers and fluids.

scholarly journals Determination of Diffusion Coefficients Using Thermogravimetric Measurements during High Temperature Oxidation

2012 ◽  
Vol 323-325 ◽  
pp. 289-294
Author(s):  
Patrice Berthod ◽  
Lionel Aranda
Keyword(s):  
Diffusion Coefficient ◽  
High Temperature ◽  
Diffusion Coefficients ◽  
High Temperature Oxidation ◽  
Concentration Profiles ◽  
Metallic Elements ◽  
Chromium Diffusion ◽  
Temperature Oxidation ◽  
Iron Based

Thermogravimetry measurements associated to concentration profiles allow determining a diffusion coefficient at high temperature of the most oxidable one among the metallic elements belonging to the chemical composition of an alloy. In this work the employed method is described and applied to chromia-forming alloys essentially based on nickel but also to selected cobalt-based and iron-based alloys. More precisely DCrvalues were estimated for chromium diffusing through the carbide-free zones developed during high temperature oxidation. The effects of the base element, of the chromium carbides density and of the dendritic orientations on the chromium diffusion were evidenced.

scholarly journals Model of Cu-Al-Fe-Ni Bronze Crystallization

2013 ◽  
Vol 13 (3) ◽  
pp. 72-79 ◽  
Author(s):  
B. P. Pisarek
Keyword(s):  
Phase Transformation ◽  
Phase Equilibrium ◽  
Systems Analysis ◽  
Thermal Effects ◽  
Original Model ◽  
High Quality ◽  
Current State ◽  
Derivative Analysis ◽  
Phase Sequence

Abstract According to the analysis of the current state of the knowledge shows that there is little information on the process of phase transformations that occur during the cooling Cu-Al-Fe-Ni hypo-eutectoid bronzes with additions of Cr, Mo and/or W, made additions individually or together, for the determination of: the type of crystallizing phases, crystallizing phases, order and place of their nucleation. On the basis of recorded using thermal and derivative analysis of thermal effects phases crystallization or their systems, analysis of the microstructure formed during crystallization - observed on the metallographic specimen casting ATD10-PŁ probe, analysis of the existing phase equilibrium diagrams forming elements tested Cu-Al-Fe-Ni bronze, with additions of Cr, Mo, W and/or Si developed an original model of crystallization and phase transformation in the solid state, the casting of high quality Cu-Al-Fe-Ni bronze comprising: crystallizing type phase, crystallizing phase sequence, place of nucleation.

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