Preparation of functional polymer‐microspheres by suspension copolymerization of ethylene glycol dimethacrylate with hydrophilic monomers

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<jats:title>Abstract</jats:title><jats:p>A study was made of suspension copolymerization of ethylene glycol dimethacrylate (EDMA) with some hydrophilic monomers (M<jats:sub>2</jats:sub>) to prepare gel particles having a large number and various kind of functional groups on their surface. Delayed charge of M<jats:sub>2</jats:sub> to partially prepolymerized EDMA suspension resulted in the formation of favorable particles. The polymerization leveled off despite an appreciable amount of remaining M<jats:sub>2</jats:sub> in the aqueous phase, and the amount of copolymerized M<jats:sub>2</jats:sub> and the fraction of on‐surface M<jats:sub>2</jats:sub> units depended significantly on the kind of M<jats:sub>2</jats:sub> as well as the mode of M<jats:sub>2</jats:sub> charge. These dependences were explained in terms of the partition coefficient of M<jats:sub>2</jats:sub> between EDMA and water and the monomer reactivity ratio.</jats:p>

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