PMMA microspheres prepared by photopolymerization under green LED irradiation Siyuan Yu , Jinfeng Xing School of Chemical Engineering and Technology, Tianjin University, China Poly(methyl methacrylate) (PMMA) microspheres are a synthetic polymer synthesized from its monomer methyl methacrylate (MMA) and can be used in various fields such as optics, coatings, cosmetics, and biomedicine [1]. Traditional preparation methods for PMMA microspheres rely on continuous heating at high temperatures over a long period [2]. Photopolymerization can be carried out at or below ambient temperature [3]. Among different types of visible light sources, LED is environmentally friendly and long-lived [4]. Herein, two facile approaches for preparing PMMA microspheres based on photopolymerization under green LED irradiation were designed. Firstly, in-situ generation of potassium oleate and miniemulsion photopolymerization were combined, and PMMA microspheres with a uniform size of 100 nm were prepared [5]. Besides, dispersion photopolymerization was carried out to rapidly prepare monodisperse PMMA microspheres using a high-efficient three-component initiating system [6]. We aim at providing a more green and efficient route for the preparation of PMMA microspheres. References 1. Ali, U.; Abd Karim, K.J.B.; Buang, N.A. A Review of the Properties and Applications of Poly (Methyl Methacrylate) (PMMA), Polym. Rev. 2015, 55, 678-705.¬ 2. Liu. Y.D.; Quan. X.M.; Choi. H.J. Synthesis and characteristics of snowman-like fluorescent PMMA microbeads. Colloid Polym. Sci. 2012, 290, 1703-1706. 3. Bongiovanni. R.; Dalle Vacche. S.; Vitale. A. Photoinduced Processes as a Way to Sustainable Polymers and Innovation in Polymer Materials. Polymers 2021, 13, 2293. 4. Le Quemener, F.; Subervie, D.; Morlet-Savary, F.; Lalevee, J.; Lansalot, M.; Bourgeat-Lami, E.; Lacote, E. Visible-Light Emulsion Photopolymerization of Styrene, Angew. Chem. Int. Edit. 2018, 57, 957-961. 5. Yu, S.Y.; Zhang, T.Y.; Xing, J.F. A facile approach preparing PMMA nanospheres through in-situ surfactant miniemulsion photopolymerization under green LED irradiation, Polymer 2022, 249 124838. 6. Yu, S.Y.; Zhou Y.T.; Zhao C.Y.; Liu, H.; Xue, Z.Y.; Xing, J.F. Rapid fabrication of monodisperse PMMA microspheres through dispersion photopolymerization under green LED irradiation, React. Funct. Polym. 2023, 188, 105594.
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