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Thermal decomposition reaction of pinacolone diperoxide: its use as radical initiator in the styrene polymerization

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Abstract

Some commercial vinyl polymers such as polystyrene, polymethylmethacrylate and polyvinyl chloride have been synthetized through last years using new initiators, for example those with multiple active sites. Multifunctional initiators in radical polymerization of vinyl monomers allow us to obtain different behaviours during the process and changes in the properties of the final products. In this work, the kinetic study of the thermal decomposition of cyclic pinacolone diperoxide (PDP) in ethylbenzene and its use in the initiation step of the bulk free radical polymerization of styrene is reported. The activation parameters for the thermal decomposition reaction of PDP in styrene were worked out from Eyring equation (ΔH ‡ = 26.0 ± 1.2 kcal mol−1; ΔS ‡ = −9.5 ± 3.0 cal mol−1 K−1). In addition, the evolution of molecular weights during polymerization was studied showing an increase through the process.

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Acknowledgements

This research project was financially supported by UNCPBA, CICPBA, CONICET and CONACyT (Mexico). A.I.C, A.B., M. A. and G. B. are member of the Carrera del Investigador Cientifico y Tecnológico, CONICET, Argentina. G. M. is member of CONACyT, México.

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Authors and Affiliations

  1. Facultad de Ingeniería, CIFICEN (UNCPBA-CONICET-CICPBA), Avda. del Valle 5737, B7400JWI, Olavarría, Buenos Aires, Argentina

    Gladys N. Eyler, Celedonio Minellono, Gastón Barreto & Adriana Cañizo

  2. Centro de Investigación en Química Aplicada, Blvd. Enrique Reyna, No. 140, 25294, Saltillo, Coahuila, Mexico

    Graciela E. Morales

  3. PLAPIQUI, Camino La Carrindanga Km 7 E2, B8000CPB, Bahía Blanca, Buenos Aires, Argentina

    Adriana Brandolin & Mariano Asteasuain

Authors
  1. Gladys N. Eyler
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  2. Celedonio Minellono
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  3. Gastón Barreto
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  4. Adriana Cañizo
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  5. Graciela E. Morales
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  6. Adriana Brandolin
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  7. Mariano Asteasuain
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Correspondence to Gladys N. Eyler.

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Eyler, G.N., Minellono, C., Barreto, G. et al. Thermal decomposition reaction of pinacolone diperoxide: its use as radical initiator in the styrene polymerization. Polym. Bull. 74, 3545–3556 (2017). https://doi.org/10.1007/s00289-017-1908-3

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  • DOI: https://doi.org/10.1007/s00289-017-1908-3

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