Synthesis and utilization of low dispersity acrylic macromonomer as dispersant for non-aqueous dispersion polymerization

Conference Dates

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.[1] 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,[2] no such study exists for dispersion polymerization, which commences as a homogeneous solution.

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