Transformation of a Kurome natural lacquer film from glassy to rubbery polymer by the presence of moisture

[Display omitted] •Gas permeability through a Kurome natural lacquer film was investigated.•Gas permeation behavior in a dry state is indicative of glassy polymers.•Gas permeation behavior in a wet state is indicative of rubbery polymers.•Lacquer films can adapt to different environments in the pres...

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Bibliographic Details
Published in:Progress in organic coatings 2017-03, Vol.104, p.43-49
Main Authors: Sato, Shuichi, Ido, Ryohei, Ose, Takamasa, Takahashi, Yoichi, Kanehashi, Shinji, Ishimura, Takahisa, Honda, Takayuki, Miyakoshi, Tetsuo, Nagai, Kazukiyo
Format: Article
Language:English
Subjects:
Carbon dioxide
Dissolved gas
Emulsion polymerization
Gas permeability
Gas permeation
Kurome natural lacquer film
Moisture
Natural gas
Oxygen
Permeability
Polymer films
Polymers
Temperature dependence
Water vapor
Water vapor permeability
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Summary:[Display omitted] •Gas permeability through a Kurome natural lacquer film was investigated.•Gas permeation behavior in a dry state is indicative of glassy polymers.•Gas permeation behavior in a wet state is indicative of rubbery polymers.•Lacquer films can adapt to different environments in the presence of moisture. The permeabilities of gaseous and dissolved (in water) oxygen and carbon dioxide through a Kurome natural lacquer film, as well as the water vapor permeability, were systematically investigated. The Kurome lacquer films contained water in their oil emulsion structure, and the films had phase-separated structures with hydrophobic glassy (i.e., urushiol) and hydrophilic rubbery (i.e., polysaccharide) polymer components. The Kurome lacquer films exhibited a relatively higher permeability for water vapor than for oxygen and carbon dioxide, indicating that the presence of hydrophilic components influenced the water vapor permeability. The gas permeation behavior of the Kurome lacquer films revealed that they behave like glassy and rubbery polymers in the dry and wet states, respectively. Thus, Kurome lacquer films are polymer materials that adapt to different environments in the presence of moisture.
ISSN:0300-9440
1873-331X
DOI:10.1016/j.porgcoat.2016.12.003