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The formation of microstructured systems of methyl methacrylate (MMA) with ethylene glycol dimethacrylate (EGDMA) in water using potassium 10-undecenoate (PUD) as the surface-active agent was investigated. Phase behavior studies for this system were conducted. Characterization of the thermodynamically stable single phase domain of the phase diagram indicated microstructural order similar to Winsor-IV microemulsions at certain compositions and lyotropic liquid crystalline behavior at higher PUD concentrations. Photoinitiated polymerizations of certain microemulsion compositions from the single phase region were conducted. Investigation of the morphology of the polymerized samples by scanning electron microscopy revealed the existence of a microporous porous structure. The continuity of the pore structure in the polymer was shown to be dependent on the microstructure of the monomer system using …