Structure of absorbed water in cis-1,4-polyisoprene rubber and its effect on properties of polymers

[Display omitted] •Structures of absorbed water in cis-1,4-polyisoprene rubber were analyzed using DSC method.•Absorbed water exists as nanometer-sized droplets in cis-1,4-polyisoprene rubber.•Water droplets affect the thermal properties of cis-1,4-polyisoprene rubber. To investigate the structures...

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Bibliographic Details
Published in:Chemical physics letters 2023-09, Vol.827, p.140694, Article 140694
Main Authors: Sato, Kazuaki, Ikeda-Fukazawa, Tomoko
Format: Article
Language:English
Subjects:
cis-1,4-polyisoprene
Differential scanning calorimetry (DSC)
Rubber
Water
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Summary:[Display omitted] •Structures of absorbed water in cis-1,4-polyisoprene rubber were analyzed using DSC method.•Absorbed water exists as nanometer-sized droplets in cis-1,4-polyisoprene rubber.•Water droplets affect the thermal properties of cis-1,4-polyisoprene rubber. To investigate the structures of absorbed water in cis-1,4-polyisoprene rubber (IPR) and their effects on the properties of IPR, differential scanning calorimetric (DSC) measurements were performed with heating from 200 K to 298 K. The result shows that the melting point of water and glass transition point of IPR depend on water content. The shift of the melting point indicates that the water exists as nanometer-sized droplets in IPR. The glass transition point of IPR changes with the specific surface area of the water droplets. It is concluded that absorbed water in hydrophobic rubbers affects thermal properties of the rubbers.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2023.140694