DIFFUSION OF SMALL MOLECULES IN POLYMER SOLUTIONS NEAR THE GLASS TRANSITION TEMPERATURE.

J. Lee, T. Frick, M. R. Landry, M. Tirrell, T. P. Lodge

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The transient optical grating technique referred to as force Rayleigh scattering provides a means to measure the transport of small molecules in polymer systems, under a variety of equilibrium and nonequilibrium conditions. One appealing feature of the experiment is the possibility of measuring self-diffusion coefficients in the absence of macroscopic concentration gradients, in contrast to the more traditional sorption and permeation experiments. We have measured the diffusion coefficients of photochromic dye molecules present in trace amounts in polymer solutions, over a wide range of temperature and polymer concentration. The results are interpreted in terms of free-volume theories.

Original languageEnglish (US)
Title of host publicationUnknown Host Publication Title
PublisherPlastics & Rubber Inst
StatePublished - Dec 1 1986

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