Colloid and Polymer Science

, Volume 276, Issue 3, pp 197–205

The effect of a polymeric additive on the evaporation of organic aerocolloidal droplets

  • J. F. Widmann
  • C. M. Heusmann
  • E. James Davis
ORIGINAL CONTRIBUTION

DOI: 10.1007/s003960050229

Cite this article as:
Widmann, J., Heusmann, C. & Davis, E. Colloid Polym Sci (1998) 276: 197. doi:10.1007/s003960050229

Abstract

 The evaporation of single triethyl phosphate (TEP) micro-droplets containing a high molecular weight polymer, poly(methyl methacrylate) (PMAA), was inves-tigated using an electrodynamic trap and light scattering measurements to explore the suppression of evaporation by the additive. Pure-component evaporation rates were measured to determine the vapor pressure over a range of temperatures, and the polymer was found to significantly decrease the evaporation rate. A numerical solution of the problem of simultaneous solvent evaporation and polymer diffusion within the droplet indicated a rapid build-up of PMMA at the surface of the drop, but vapor/liquid thermodynamic considerations alone do not account for the observed reduction in the evaporation rate for the droplets containing PMMA. After significant evaporation of TEP occurred, the ultra-low evaporation rate was measured using changes in the Raman spectra associated with morphology-dependent resonances. The evaporation in this regime appears to be controlled by the rate of solvent molecules diffusing through the polymer matrix.

Key words Microdropletspolymer solutionstriethyl phosphatepoly(methyl methacrylate)electrodynamic balance

Copyright information

© Steinkopff Verlag 1998

Authors and Affiliations

  • J. F. Widmann
    • 1
  • C. M. Heusmann
    • 1
  • E. James Davis
    • 1
  1. 1.Department of Chemical Engineering Box 351750 University of Washington Seattle, WA 98195-1750 USAUS