Simultaneous control of copolymer composition and MWD in emulsion copolymerization

Authors

  • M. Vicente,

    1. Institute for Polymer Materials (POLYMAT) and Grupo de Ingeniería Química, Dpto. de Química Aplicada, Facultad de Ciencias Químicas, The University of the Basque Country, Donostia-San Sebastián 20018, Spain
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  • J. R. Leiza,

    1. Institute for Polymer Materials (POLYMAT) and Grupo de Ingeniería Química, Dpto. de Química Aplicada, Facultad de Ciencias Químicas, The University of the Basque Country, Donostia-San Sebastián 20018, Spain
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  • J. M. Asua

    Corresponding author
    1. Institute for Polymer Materials (POLYMAT) and Grupo de Ingeniería Química, Dpto. de Química Aplicada, Facultad de Ciencias Químicas, The University of the Basque Country, Donostia-San Sebastián 20018, Spain
    • Institute for Polymer Materials (POLYMAT) and Grupo de Ingeniería Química, Dpto. de Química Aplicada, Facultad de Ciencias Químicas, The University of the Basque Country, Donostia-San Sebastián 20018, Spain
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Abstract

Copolymer composition and molecular-weight distribution of linear copolymers were controlled simultaneously by maintaining concentrations of the monomers and chain-transfer agent (CTA) at calculated values. The unreacted amounts of monomers and CTA were inferred by on-line measurements of the reaction heat. Styrene/n-butylacrylate emulsion copolymers of predefined constant compositions and MWDs (narrow and broad monomodal, and bimodal with different polydispersities index in each mode) were obtained by this control approach using tertdodecyl mercaptan as CTA.

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