LAUSR

Efficient synthesis of polymeric microspheres with high uniformity, well-defined surface functionality, and precise diameter and composition has long been a challenging goal in polymer science. Herein, we exploited photoinitiated reversible addition–fragmentation transfer (RAFT) dispersion polymerization of methyl methacrylate using poly(glycerol monomethacrylate)-based macromolecular chain transfer agents (macro-CTAs). We showed that the use of a binary mixture of macro-CTA and CTA with poor controllability was crucial for obtaining monodisperse poly(methyl methacrylate) (PMMA) microspheres. Evolution of PMMA microspheres during the polymerization was followed by scanning electron microscopy and 1H NMR spectroscopy, confirming a linear evolution of particle volume with monomer conversion. PMMA microspheres with better colloidal stability were obtained when increasing the amount of macro-CTA used in photoinitiated RAFT dispersion polymerization. Finally, a two-stage photoinitiated RAFT dispersion polymeri...