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Water Vapor Permeability of Polypropylene

Yuka Togashi, Masanori Hara

Fusion Science and Technology / Volume 60 / Number 4 / November 2011 / Pages 1471-1474

Interaction with Materials / Proceedings of the Ninth International Conference on Tritium Science and Technology (Part 2)

To understand the water vapor transport through a polypropylene film at near ambient temperature, water vapor permeation and sorption measurements were carried out using tritiated water as tracer. The activation energy and frequency factor of the permeability were found to be 11 kJ/mol and 1.5 x 10-10 cm3(STP) cm cm-2 s-1 Pa-1, respectively. The corresponding values of the solubility were determined to be -30 kJ/mol and 2.9 x 10-10 cm3(STP) cm-3 Pa-1. Because the permeation can be described by a one-dimensional diffusion model, the diffusion coefficient was evaluated from the quotient of permeability and solubility. The activation energy of water diffusion through polypropylene was calculated to be 41 kJ/mol.

 
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