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This study introduces a simple technique that can be used to quantitatively probe interparticle polymer diffusion (IPD) between adjacent particles in a latex film using pyrene excimer fluorescence (PEF). To demonstrate the validity of the technique, four latexes were prepared: two pyrene-labeled poly(n-butyl methacrylate) (Py-PBMA) latexes and two nonfluorescent PBMA latexes. The two pairs of Py-PBMA and PBMA latexes had similar distributions of polymer molecular weight and particle diameters. Mixtures of latex dispersions having a composition of 5 wt % Py-PBMA latex and 95 wt % nonfluorescent PBMA latex were cast into films. Fluorescence spectra of the films were acquired, and the ratio of the fluorescence intensities for the pyrene monomer (IM) and excimer (IE) was calculated to determine the IE/IM ratio. The latex films were then annealed at a constant temperature set between 75 and 119 °C. The fraction of mixing (fm), representing the amount of polymer having diffused out of a particle, was determined...

Using Pyrene Excimer Fluorescence To Probe Polymer Diffusion in Latex Films