INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
CONTROLLED ACRYLIC ACID POLYMERIZATION BY COMBINING REDOX INITIATION AND CHAIN TRANSFER
Autor/es:
CAROLINA G. GUTIERREZ; LUIS M. GUGLIOTTA; GERARDO CÁCERES MONTENEGRO; JORGE R. VEGA; ROQUE J. MINARI
Lugar:
Cancún
Reunión:
Simposio; XV Simposio Latinoamericano de Polímeros y XIII congreso Iberoamericano de Polímeros; 2016
Institución organizadora:
Sociedad Polimérica de México
Resumen:
Polyacrylic acid (PAA) of low molar mass (MM) (≈104 g.mol-1)1 is mainly obtained by polymerization of acrylic acid (AA) in aqueous solution using thermal initiators and a chain transfer agent (CTA)2. In this work, a "semibatch" AA polymerization at 45 °C is investigated to produce low MM PAA, by using redox initiators with an excess of reducing agent (RA), which also acts as CTA. Experiments were carried out at constant feed rates of AA, oxidizing agent and RA. A mathematical model was developed to estimate main reaction variables, with the following assumptions: homolytic decomposition of oxidizing agent, generation of secondary radical (SPR) carbon centered, intramolecular H transfer (backbiting), intermolecular transfer to the polymer giving tertiary radicals (MCR), propagation of MCR with AA, and termination of SPR and MCR by bimolecular combination. Termination by disproportionation was neglected.