Synthesis and utilization of low dispersity acrylic macromonomer as dispersant for non-aqueous dispersion polymerization
May 20-25, 2018
Non-aqueous poly(acrylic) dispersions (NADs) used in automotive coating formulations are heterogeneous high-solids suspension of polymeric nano-size particles (< 200 nm) produced by radical polymerization in organic hydrocarbon medium. An important component of the system is the low molecular weight (MW) reactive polymeric dispersant (5000-6000 Da) that stabilizes the particles formed. A vinyl-terminated butyl methacrylate (BMA) macromonomer dispersant synthesized by cobalt chain transfer polymerization (CCTP) has been shown to be more effective at stabilizing the nanoparticles formed during the NAD process than a BMA based grafted dispersant with vinyl groups attached at random positions along the backbone. The macromonomer, although having controlled double-bond placement through CCT chemistry, still have a molecular weight dispersity of close to two (Figure 1A). While the role of dispersity of a self-assembling amphiphilic block copolymer has been studied in emulsion polymerization, no such study exists for dispersion polymerization, which commences as a homogeneous solution.
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Mingmin Zhang and Robin A. Hutchinson, "Synthesis and utilization of low dispersity acrylic macromonomer as dispersant for non-aqueous dispersion polymerization" in "Polymer Reaction Engineering X (PRE 10)", John Tsavalas, University of New Hampshire, USA Fouad Teymour, Illinois Institute of Technology, USA Jeffrey Stubbs, HP Inc., USA Jose R. Leiza, University of the Basque Country, Spain Eds, ECI Symposium Series, (2018). http://dc.engconfintl.org/prex/55