Gas, Vapor and Water Transport in Polymer Films

1973 ◽  
pp. 321-338 ◽  
Author(s):  
V. Stannett ◽  
H. B. Hopfenberg ◽  
J. L. Williams
Keyword(s):  
Water Transport ◽  
Polymer Films

Ideal laminate theory for water transport analysis of metal-coated polymer films

2008 ◽  
Vol 93 (13) ◽  
pp. 133307 ◽  
Author(s):  
Changsoo Jang ◽  
Young-Rae Cho ◽  
Bongtae Han
Keyword(s):  
Water Transport ◽  
Polymer Films ◽  
Laminate Theory ◽  
Transport Analysis

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.

Surface-Induced Nanostructure and Water Transport of Thin Proton-Conducting Polymer Films

2013 ◽  
Vol 46 (14) ◽  
pp. 5630-5637 ◽  
Author(s):  
Sangcheol Kim ◽  
Joseph A. Dura ◽  
Kirt A. Page ◽  
Brandon W. Rowe ◽  
Kevin G. Yager ◽  
...  
Keyword(s):  
Conducting Polymer ◽  
Water Transport ◽  
Polymer Films ◽  
Proton Conducting ◽  
Conducting Polymer Films

Gum arabic helps prepare better lacey polymer films for specimen support in electron microscopy

1993 ◽  
Vol 51 ◽  
pp. 240-241
Author(s):  
Shailesh R. Sheth ◽  
Jayesh R. Bellare
Keyword(s):  
Electron Microscopy ◽  
Polymer Films ◽  
Gum Arabic ◽  
Complete Removal ◽  
Ammonium Bromide ◽  
Release Agent ◽  
Astigmatism Correction ◽  
Long Time ◽  
Micro Holes ◽  
Cetyl Trimethyl Ammonium

Specimen support and astigmatism correction in Electron Microscopy are at least two areas in which lacey polymer films find extensive applications. Although their preparation has been studied for a very long time, present techniques still suffer from incomplete release of the film from its substrate and presence of a large number of pseudo holes in the film. Our method ensures complete removal of the entire lacey film from the substrate and fewer pseudo holes by pre-treating the substrate with Gum Arabic, which acts as a film release agent.The method is based on the classical condensation technique for preparing lacey films which is essentially deposition of minute water or ice droplets on the substrate and laying the polymer film over it, so that micro holes are formed corresponding to the droplets. A microscope glass slide (the substrate) is immersed in 2.0% (w/v) aq. CTAB (cetyl trimethyl ammonium bromide)-0.22% (w/v) aq.

Is the chain dynamics in thin polymer films isotropic ?

2000 ◽  
Vol 10 (PR7) ◽  
pp. Pr7-233-Pr7-237 ◽  
Author(s):  
S. Rivillon ◽  
P. Auroy ◽  
B. Deloche
Keyword(s):  
Polymer Films ◽  
Thin Polymer Films ◽  
Chain Dynamics ◽  
Thin Polymer

Influence of magnetic field to the allocation of imputiry molecules in the structure of optically transparent polymer films

2016 ◽  
Vol 38 (3) ◽  
pp. 205-210
Author(s):  
L.A. Bulavin ◽  
◽  
Yu.F. Zabashta ◽  
О.О. Brovko ◽  
L.Yu. Vergun ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Polymer Films ◽  
Optically Transparent

Scanning-tunneling spectroscopy on conjugated polymer films

2003 ◽  
Vol 771 ◽  
Author(s):  
M. Kemerink ◽  
S.F. Alvarado ◽  
P.M. Koenraad ◽  
R.A.J. Janssen ◽  
H.W.M. Salemink ◽  
...  
Keyword(s):  
Polymer Films ◽  
Conjugated Polymer ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Direct Consequence ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Band Alignment ◽  
Scanning Tunneling ◽  
Order Of Magnitude

AbstractScanning-tunneling spectroscopy experiments have been performed on conjugated polymer films and have been compared to a three-dimensional numerical model for charge injection and transport. It is found that field enhancement near the tip apex leads to significant changes in the injected current, which can amount to more than an order of magnitude, and can even change the polarity of the dominant charge carrier. As a direct consequence, the single-particle band gap and band alignment of the organic material can be directly obtained from tip height-voltage (z-V) curves, provided that the tip has a sufficiently sharp apex.

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