First, using Isopropyl alcohol as the solvent, I synthesized the copolymer by Methyl methacrylate and Acrylic acid. After copolymerization, at 70 C-degree, the copolymer dissolved into IPA. Afterward, I added ZnO powder into the solution with vigorous agitation. While the system got back to room-temp, I had ZnO/Poly(MMA-co-AA) composite precipitated at bottom. The problem is ~ ZnO particles couldn't well-dispersed in copolymer <the ZnO/Poly(MMA-co-AA) composite wasn't transparent, and ZnO particle size was around 80 nm.> It seemed that ZnO doesn't disperse in IPA, so I couldn't make ZnO well-dispersed into copolymer at blending process, while copolymer and IPA were totally transparent solution at 70C. So, how can I make ZnO well-dispersed in copolymer by blending ? Change the solvent from IPA ?! (but the solvent chosen has to be suitable for the copolymerization of MMA & AA.) Or, get ZnO surface modified ?! this my headache ~ thanks anyway !!