<em>Ab initio</em> RAFT emulsion polymerization of SBR mediated by poly(acrylic acid-<em>b</em>-styrene) trithiocarbonate
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Emulsion styrene butadiene rubber (E-SBR) is widely used in industries such as tire manufacturing and automotive applications due to its cost-effectiveness and environmental benefits, as it utilizes water as a solvent. However, the broad molecular weight distribution (MWD) of ESBR leads to energy loss and negatively impacts its dynamic viscoelastic properties. The surfactants used to form micelles adversely affect the physical properties of ESBR compounds and lead to environmental pollution. We present the ab initio reversible addition-fragmentation chain transfer (RAFT) emulsion polymerization of SBR using poly(acrylic acid-b-styrene) trithiocarbonate as a surfactant and macroRAFT agent. Through RAFT polymerization, we synthesized SBR with a narrow MWD. Fourier transform infrared (FTIR) and 1H NMR spectroscopy confirmed the successful RAFT polymerization of ESBR. A narrow particle size distribution of ESBR with 112 nm in diameter was confirmed using dynamic light scattering (DLS).