The Synthesis and Application of Water Vapor Permeable Polyurethane Film
Date Issued
2009
Date
2009
Author(s)
Lin, Chia-Yen
Abstract
The study is about hydrophilic polyurethane film and its properties and applications, and how its water vapor permeability can be controlled via temperature. We varied polyurethane formulations of hard segment concentration, hydrophilic segment concentration, and isocyanate index to see how these variables affect mechanical properties, thermal properties, morphology, and water vapor permeability of the hydrophilic polyurethane film. Also, water vapor permeability at different temperature is found to be temperature dependent following Arrhenius equation. However, the water vapor permeability near glass transition temperature exhibited very different behavior and does not follow the Arrhenius equation. An abrupt 3200 % water permeability increase is observed at the glass transition temperature region. And from the experiment data and AFM (Atomic Force Microscope) we found that polyethylene glycol (PEG) of soft domain plays a critical role in water vapor permeability.
Subjects
hydrophilic polyurethane film
hard segment
hydrophilic segment
water vapor permeability
glass transition temperature
Type
thesis
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