Abstract
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.
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