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PEG-DAc microparticles were formed at various concentration of PEG-DAc 3400 by UV photoinitiation with DMPAP and acrylic acid as a co-monomer. The formed microparticles were washed with DI water and collected by centrifugation. The mass remaining after freeze drying was compared to the starting mass of PEG-DAc. Error bars are standard deviations, n = 3 for each condition, except 3.0% (n=2). *p < 0.05 versus 2.5%.
