Determination of diffusion coefficient of water in polymer films by TGA

Autor:	Toshio Ogawa, Toshio Nagata, Yoshikazu Hamada
Rok vydání:	1993
Předmět:	chemistry.chemical_classification Thermogravimetric analysis Polymers and Plastics Sample Weight Diffusion Analytical chemistry Humidity General Chemistry Polymer Activation energy Surfaces Coatings and Films Cylinder (engine) law.invention Thermogravimetry chemistry law Materials Chemistry
Zdroj:	Journal of Applied Polymer Science. 50:981-987
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1993.070500607
Popis:	This study is concerned with the determination of the diffusion coefficient of water into polymer films using a thermogravimetric analyzer (TGA). First, the sample film in the sample chamber was dried completely by N2 gas supplied by a cylinder. Next, the mixture of air and N2 gas having a given humidity was introduced into the sample chamber of the TGA. The sample weight was recorded as a function of time. The diffusion coefficient was calculated from the initial slope of weight vs. the square root of the time curve. The results were consistent with those obtained using Prager and Long's method. © 1993 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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