The Effect Of Emulsion Polymerization Technology On Large Scale

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Monodisperse sub-200nm polystyrene nanoparticles were synthesized by a facile one-step emulsion polymerization technology using sodium dodecyl sulfonate (SDS) and 2, 2′-azobis (2-methylpropionamide) dihydrochloride (AIBA) as the surfactant and initiator, respectively. The in situ neutralization between negatively charged surfactant SDS and positively charged AIBA was used to control the primary particle (or swollen micelle) volume and the extent of the particle coagulation. As the oligomeric radicals with cationic AIBA chain ends were captured by anionic swollen micelles, the electrostatic stability of swollen micelles gradually reduced, further promoting the primary particle coagulation. As a result, the initial particle number decreased with the addition of AIBA. The earlier primary particle coagulation not only enlarged the particle size, but also narrowed the particle size distribution of the final latex particles. This approach was easy to scale-up as a facile industrial technology to produce monodisperse polymeric nanoparticles on large scale. Keywords: Emulsion polymerization; Nanoparticle; Monodisperse; Particle coagulation; AIBA 1. Introduction Emulsion polymerization technology is widely applied in many fields including synthetic rubber, thermoplastics, coating, adhesive, and plastic modifier [1–4]. Much of the interest in it derives from the possibilities for the preparation of monodisperse or functional latex particles [5,6]. Until today, the challenges

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