Abstract
The kinetics of photochemically initiated polymerization of acrylamide and monomer-glycerol solution microdroplets has been explored by following the polymerization reaction by means of a fluorescent dye tracer, auramine-O. Polymerization rate constants have been estimated for the solutions by measuring the decrease in evaporation rate caused by polymerization, using a mathematical model of the simultaneous evaporation/polymerization process. Single charged droplets with initial diameters of order 50 μm were suspended in the paths of two laser beams by ac and dc electrical fields in a combination electrodynamic balance and light-scattering spectrometer. One laser beam was used to size the microsphere by elastic scattering measurements, and the second beam provided the excitation energy for fluorescence. Polymerization rate data and evaporation rate data and are presented for solid acrylamide microspheres and for solution microparticles for various system parameters.
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