Abstract
We have studied the influence of the chemical structures of thermoplastic polyurethane elastomers (TPUs) on their permeability to carbon dioxide and oxygen. The gas permeability of a TPU was dependent on the chemical structures not only of the soft segments but also of the hard segments. A TPU whose soft segment consists of poly(oxytetramethylene) exhibited a higher carbon dioxide permeability than does a TPU with ester bonds in the soft segment. The introduction of poly(dimethylsiloxane) chains into the TPU markedly enhanced the carbon dioxide permeability. In a series of TPUs containing poly(oxytetramethylene)glycol (PTMG), the gas permeability increased with the chain length of the soft segments. In the dissolution–diffusion process of gas permeation, the diffusion process predominated.
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Matsunaga, K., Sato, K., Tajima, M. et al. Gas Permeability of Thermoplastic Polyurethane Elastomers. Polym J 37, 413–417 (2005). https://doi.org/10.1295/polymj.37.413
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DOI: https://doi.org/10.1295/polymj.37.413
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