scholarly journals Correlating 3D porous structure in polymer films with mass transport properties using FIB-SEM tomography

2021 ◽  
pp. 100109
Author(s):  
C. Fager ◽  
T. Gebäck ◽  
J. Hjärtstam ◽  
M. Röding ◽  
A. Olsson ◽  
...  
Keyword(s):  
Mass Transport ◽  
Porous Structure ◽  
Transport Properties ◽  
Polymer Films

Novel Method for Visualizing Water Transport Through Phase-Separated Polymer Films

2014 ◽  
Vol 20 (2) ◽  
pp. 394-406 ◽  
Author(s):  
Anna Jansson ◽  
Catherine Boissier ◽  
Mariagrazia Marucci ◽  
Mark Nicholas ◽  
Stefan Gustafsson ◽  
...  
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Water Transport ◽  
Polymer Films ◽  
Visual Information ◽  
Water Soluble ◽  
Polymeric Coating ◽  
Coating Film ◽  
Coating Films ◽  
Novel Method

AbstractDrug release from oral pharmaceutical formulations can be modified by applying a polymeric coating film with controlled mass transport properties. Interaction of the coating film with water may crucially influence its composition and permeability to both water and drug. Understanding this interaction between film microstructure, wetting, and mass transport is important for the development of new coatings. We present a novel method for controlled wetting of polymer coating films in an environmental scanning electron microscope, providing direct visual information about the processes occurring as the film goes from dry to wet. Free films made of phase-separated blends of water-insoluble ethyl cellulose (EC) and water-soluble hydroxypropyl cellulose (HPC) were used as a model system, and the blend ratio was varied to study the effect on the water transport properties. Local variations in water transport through the EC/HPC films were directly observed, enabling the immediate analysis of the structure–mass transport relationships. The leaching of HPC could be studied by evaporating water from the films in situ. Significant differences were observed between films of varying composition. The method provides a valuable complement to the current approach of making distinct diffusion and microscopy experiments for studying the dynamic interaction of polymer films with water.

Porous Structure and Transport Properties of a Carbonized Phenolic Resin

1995 ◽  
Vol 60 (2) ◽  
pp. 172-187 ◽  
Author(s):  
Pavel Fott ◽  
František Kolář ◽  
Zuzana Weishauptová
Keyword(s):  
Porous Structure ◽  
Transport Properties ◽  
Phenolic Resin ◽  
Arrhenius Equation ◽  
Mercury Porosimetry ◽  
Micropore Volume ◽  
Microporous Structure ◽  
Wetting And Drying ◽  
Phenolic Resins ◽  
Kinetics Of

On carbonizing phenolic resins, the development of porous structure takes place which influences the transport properties of carbonized materials. To give a true picture of this effect, specimens in the shape of plates were prepared and carbonized at various temperatures. The carbonizates obtained were studied by adsorption methods, electron microscopy, and mercury porosimetry. Diffusivities were evaluated in terms of measuring the kinetics of wetting and drying. It was found out that the porous structure of specimens in different stages of carbonization is formed mostly by micropores whose volumes were within 0.06 to 0.22 cm3/g. The maximum micropore volume is reached at the temperature of 750 °C. The dependence of diffusivity on the carbonization temperature is nearly constant at first, begins to increase in the vicinity of 400 °C, and at 600 °C attains its maximum. The experimental results reached are in agreement with the conception of the development and gradual closing of the microporous structure in the course of carbonization. The dependence of diffusivity on temperature can be expressed by the Arrhenius equation. In this connection, two possible models of mass transport were discussed.

A Novel Manganese(II) MOCVD Precursor: Synthesis, Characterization, and Mass Transport Properties of Mn(hfa)2•tmeda

2013 ◽  
Vol 19 (1-3) ◽  
pp. 22-28 ◽  
Author(s):  
Zaira Lipani ◽  
Maria R. Catalano ◽  
Patrizia Rossi ◽  
Paola Paoli ◽  
Graziella Malandrino
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Precursor Synthesis ◽  
Mocvd Precursor

Effect of confining pressure and microcracks on mass transport properties of concrete

2014 ◽  
Vol 113 (8) ◽  
pp. 485-495 ◽  
Author(s):  
Z. Wu ◽  
H. S. Wong ◽  
N. R. Buenfeld
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Confining Pressure

Charge and mass transport properties of LiI-P(EO)n-Al2O3-based composite polymer electrolytes

1998 ◽  
Vol 43 (10-11) ◽  
pp. 1315-1320 ◽  
Author(s):  
E Strauss ◽  
D Golodnitsky ◽  
G Ardel ◽  
E Peled
Keyword(s):  
Mass Transport ◽  
Transport Properties ◽  
Polymer Electrolytes ◽  
Composite Polymer ◽  
Composite Polymer Electrolytes

Prediction of transport properties of permeants through polymer films: A simple gravimetric experiment

1988 ◽  
Vol 65 (4) ◽  
pp. 368 ◽  
Author(s):  
L. N. Britton ◽  
R- B. Ashman ◽  
T. M. Aminahhavi ◽  
P. E. Cassidy
Keyword(s):  
Transport Properties ◽  
Polymer Films

Mass Transport Properties of Ionized Dilute Electrolytes

1971 ◽  
pp. 61-116 ◽  
Author(s):  
H. FALKENHAGEN ◽  
W. EBELING ◽  
W.D. KRAEFT
Keyword(s):  
Mass Transport ◽  
Transport Properties
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