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Effect of temperature and molecular weight on the interfacial tension of PS/PDMS blends

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Abstract.

The imbedded-fiber retraction (IFR) method was used to study the effect of temperature and PDMS molecular weight on the interfacial tension of PS/PDMS blends. The interfacial tension decreased with increasing temperature and analysis of the temperature dependence using a simple linear fit gave –dγ/dT value of 0.058±0.010 dyn/cm-deg. Reported –dγ/dT values of PS/PDMS blends are highly dependent on the molecular weights of the polymers and can have values that are <0, 0, or >0. Our interfacial tension values were independent of the molecular weight of PDMS and this was attributed to the molecular weights studied here being well above the entanglement values of both polymers. However, analysis of interfacial tension data from this work and the literature showed the following empirical relationship between apparent blend molecular weight, Mb, and interfacial tension of PS/PDMS blends with a correlation of 0.94: γ12=γ0+k2Mb (–2/3), where γ0=7.3±0.3 dyn/cm; k2=–517±41 (dyn/cm)(g/mol)2/3.

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Acknowledgements.

We would like to thank A.R. Loffredo, A.J. Lulay, and A.J. Thomas for their help with obtaining the viscosity and interfacial tension data, and Dr. E.B. Bagley for reviewing and commenting on this manuscript.

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Authors and Affiliations

  1. Biomaterials Processing Research Unit, National Center for Agricultural Utilization Research, Agricultural Research Service, United States Department of Agriculture, 1815 N. University Street, Peoria IL 61604, USA

    Girma Biresaw & Craig J. Carriere

  2. Materials Science Group, Corporate R&D, The Dow Chemical Company, 1702 Building, Midland MI 48674, USA

    Robert L. Sammler

Authors
  1. Girma Biresaw
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  2. Craig J. Carriere
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  3. Robert L. Sammler
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Correspondence to Girma Biresaw.

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Biresaw, G., Carriere, C.J. & Sammler, R.L. Effect of temperature and molecular weight on the interfacial tension of PS/PDMS blends. Rheol Acta 42, 142–147 (2003). https://doi.org/10.1007/s00397-002-0265-8

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  • DOI: https://doi.org/10.1007/s00397-002-0265-8

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