Journal of Chemical Process and Material Technology http://publikasiilmiah.unwahas.ac.id Purnavita et.al., vol(1), 10-17, 2022 Chemical Engineering-UNIVERSITAS WAHID HASYIM 10 Polymerization of Poly Methyl Methacrylate Using Emulsion Method and H2O2 as Initiator Sari Purnavita 1* , Cyrilla Oktaviananda 2 , Sri Sutanti 3 , Herman Yoseph Sriyana 4 , Antonius Prihanto 5 1,2,3,4,5 Program Studi D3 Teknik Kimia, Politeknik Katolik Mangunwijaya * Corresponding Author: cyrillaoktaviananda.28@gmail.com Abstract Polymethyl Methacrylate is a synthetic polymer prepared by free radical addition and polymerization. By emulsion polymerization, polymethyl methacrylate can be applied as paints, adhesives, and coatings. The amount of polymer produced from a reaction will be influenced by the type of initiator according to the characteristics of the monomer and the amount of initiator added. Therefore, research is needed to study the effect of the number of initiators (H2O2) on the amount of polymer formed. The independent variables in this study were H2O2 by 1%, 2%, 3%, and 4%. This research procedure was carried out in a two-stage process. The first stage is the process of separating the inhibitor contained in the methyl methacrylate monomer by adding a 1 N concentration of NaOH solution while stirring until evenly distributed, then put into a separating funnel to separate pure methyl methacrylate from the inhibitor dissolved in alkaline solution. The second stage is the polymerization reaction process using the emulsion method. Dissolve polyvinyl alcohol in hot water at 70 o C, put the polyvinyl alcohol solution into a three- neck flask equipped with a stirrer and a hot plate heater, add the initiator to 60 o C, then add methyl methacrylate monomer while stirring and heating at room temperature 100 o C for 1 hour. . The resulting product is a thick poly methyl methacrylate emulsion, and milky white. The results showed that the more initiators were added, the higher the viscosity and the higher the solids content. Keywords: Initiator; Methyl Methacrylate, Emulsion INTRODUCTION Polymethyl methacrylate is clear, colorless transparent plastic with a higher softening point, better impact strength, and better wearability. It is available in molding and extrusion compositions, syrups, cast sheets, rods, and tubes. Perhaps the outstanding property of poly methyl methacrylate is its optical clarity and lack of color (Billmeyer, 1994). PMMA (IUPAC name: poly [1-(methoxycarbonyl)-1-methyl ethylene]) is a synthetic polymer prepared by the free radical addition and polymerization of methyl methacrylate (C5H2O8) to poly methyl methacrylate (C5O2H8)n (Zafar, 2020). Polymethyl