Abstract
Poly(vinyl acetate) particles were prepared by dispersion polymerization in isooctane using a copolymer of 2-ethylhexyl methacrylate [EHMA] and 2-isocyanatoethyl methacrylate as a steric stabilizer. These reactive particles were singly or doubly labeled specifically in the stabilizer phase. Donor fluorescence decay profiles were measured, and the data were fitted to the Klafter-Blumen model for energy transfer on fractal surfaces. The finding that the effective dimensionality d=2 for this energy transfer process is interpreted in terms of a crossover in a restricted geometry: the PEHMA domains in this material are characterized by at least one linear dimension that is small and on the order of the characteristic distance (Ro=26A) for the energy transfer
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