Redox-initiated poly(methyl methcrylate) emulsion polymerizations stabilized with block copolymers based on poly(ethylene oxide), e-caprolactone and linoleic acid

B.H. Tan, Tijs Nabuurs, Jan Feijen, Dirk W. Grijpma

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

A redox initiating system, consisting of t-butyl hydroperoxide (tBHPO), isoascorbic acid (iAA), and ethylenediaminetetraacetic acid ferric-sodium salt (FeEDTA) was employed in emulsion polymerizations of methyl methacrylate (MMA) at high solids contents of 30 wt % in water. The system was stabilized using, linoleic acid (LA)-functionalized and nonfunctionalized surfactants based on methoxy-PEG (MPEG) and ε-caprolactone (CL). To optimize polymerization conditions and to avoid coagulation and solidification during the reaction, the temperature, the amount of initiator, the chemical characteristics of the surfactant, and the surfactant to monomer ratio were varied. MPEO45-CL6.5-LA (the subscripts refer to the average number of repeating monomer units) was found to be the most suitable surfactant, as it performs adequately under suboptimal reaction conditions. In the emulsion polymerization of MMA in water at ∼30 wt %, best results were obtained at a reaction temperature of 60 °C, with an initiator system comprising tBHPO iAA and FeEDTA, and a surfactant to monomer ratio of 10/90 by weight or higher. Under these conditions, stable PMMA latices with average particle sizes of 200–300 nm were obtained at complete monomer conversion.
Original languageUndefined
Pages (from-to)4234-4244
JournalJournal of polymer science. Part A: Polymer chemistry
Volume47
Issue number17
DOIs
Publication statusPublished - 2009

Keywords

  • METIS-263351
  • reactive surfactant
  • block polymers
  • linoleic acid functionalization
  • polymethyl methacrylate
  • IR-72588
  • Block copolymeric surfactant
  • Emulsion polymerization
  • Stabilization
  • Surfactants

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