INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
SEMIBATCH ACRYLIC ACID POLYMERIZATION CONTROLLED BY REDOX INITIATION
Autor/es:
G CÁCERES MONTENEGRO; VEGA, J. R.; GUTIERREZ C. G.; GUGLIOTTA, L. M.; MINARI, R. J.
Lugar:
Bahía Blanca
Reunión:
Congreso; X Congreso Argentino de Ingeniería Química; 2017
Institución organizadora:
Asociación Argentina de Ingeniería Química
Resumen:
Low molar mass Poly(acrylic acid) (PAA) is generally obtained by radical polymerization of acrylic acid (AA) in aqueous solution, using thermal initiators and chain transfer agents (CTA). This strategy is not enough to reach the low molar masses required for the final product to act as a dispersant. In this work, the semibatch polymerization ofAA at 45 ºC was considered, using potassium persulfate (KPS) and sodium metabisulfite(KPS / NaMBS), or KPS and sodium hypophosphite (KPS / NaHP) as redox initiators to produce PAA of low molar mass (MM). These initiation systems enables to obtain PAA with Mn ≈ 2.0 KDa, relatively narrow MMD (Mw/Mn≈2), and a low branching degree (BD) per molecule. Typically, the polymerization reactions reach an almost complete conversion (≥ 94%), and both NaMBS and NaHP also behave as CTA. Results indicate that the two couple redox allow obtaining polymers with acceptable deflocculant capacities.