title: Analysis of semibatch emulsion polymerization: role of ultrasound and initiator.
abstract: In this work semibatch miniemulsion was carried out wherein the effect of free radicals produced by ultrasound and an external addition of initiator was examined. Influence of different variables on polymerization rate and polymer particle size has also been investigated. Over a range of 0-4% (by wt) initiator, the polymerization rate was found to increase over a range of 0.56-1.33 g L(-1) min(-1). Similarly monomer concentration range (7.2-15 wt.%) changed the polymerization rate from 1.33 to 2.61 g L(-1) min(-1). Under optimum parametric conditions polymer particle size 50 nm were obtained with a narrow size distribution. Syndiotactic phase of PMMA was observed by controlling the formulation recipe. Although, number of reports could be found in the literature [9,13,17,18,20,22] related to batch emulsion polymerization, this experimental data could be useful for the production of large scale monodispersed PMMA latex as all of the scale-up and design parameters have been qualitatively addressed.
authors.affiliation: Vishwakarma Institute of Technology, 666, Upper Indira Nagar, Pune 411 037, India.
authors.forename: B A
authors.initials: BA
authors.lastname: Bhanvase
authors.forename: D V
authors.initials: DV
authors.lastname: Pinjari
authors.forename: S H
authors.initials: SH
authors.lastname: Sonawane
authors.forename: P R
authors.initials: PR
authors.lastname: Gogate
authors.forename: A B
authors.initials: AB
authors.lastname: Pandit
mesh_terms: D004655:Emulsions / Q000138:chemical synthesis / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry; D010316:Particle Size; D019904:Polymethyl Methacrylate / Q000138:chemical synthesis* / Q000737:chemistry; D013499:Surface Properties; D013501:Surface-Active Agents / Q000737:chemistry; D013696:Temperature; D014465:Ultrasonics
chemical_list: D004655:Emulsions; D013501:Surface-Active Agents; D019904:Polymethyl Methacrylate