Synthesis of new compatibilizers to poly(lactic acid) blends

Authors

  • R. Gallego,

    1. Department of Materials-Process-Product Foundation for Research and Development in Transport and Energy (CIDAUT), Parque Tecnológico de Boecillo, 47151, Boecillo, Valladolid, Spain
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  • S. López-Quintana,

    1. Materials area Miranda de Ebro's Technology Center (CTME), 09200, Miranda de Ebro, Burgos, Spain
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  • F. Basurto,

    1. Departament of Condensed Matter Physics, Escuela de Ingenierías Industriales, University of Valladolid, Valladolid, Spain
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  • K. Núñez,

    Corresponding author
    1. Departament of Condensed Matter Physics, Escuela de Ingenierías Industriales, University of Valladolid, Valladolid, Spain
    • Departament of Condensed Matter Physics, Escuela de Ingenierías Industriales, University of Valladolid, Paseo del Cauce, 59, 47011, Valladolid, Spain. E-mail: karnun@cidaut.es

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  • N. Villarreal,

    1. Department of Materials-Process-Product Foundation for Research and Development in Transport and Energy (CIDAUT), Parque Tecnológico de Boecillo, 47151, Boecillo, Valladolid, Spain
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  • J.C. Merino

    1. Department of Materials-Process-Product Foundation for Research and Development in Transport and Energy (CIDAUT), Parque Tecnológico de Boecillo, 47151, Boecillo, Valladolid, Spain
    2. Departament of Condensed Matter Physics, Escuela de Ingenierías Industriales, University of Valladolid, Valladolid, Spain
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Abstract

In this study, the effectiveness of three random copolymers based on blocks of poly(lactic acid) and polyethylene (PLA-PE) used as compatibilizer in PLA and high density polyethylene blends (PLA/HDPE) was evaluated in terms of thermal and mechanical properties. The compatibilizers were synthesized by different ways: reactive extrusion (C1), ring opening polymerization of lactide with PE with —OH substituent group (PE-OH) as initiator (C2) and polycondensation of lactic acid in presence of PE grafted with maleic anhydride (PE-g-MAH) (C3). The compatibilizers were used in two different proportions (5 and 15 wt%) and their efficiency was compared with a commercial compatibilizer (C0). The blends with C2 compatibilizer exhibited the highest tensile toughness (350% of increment compared with neat PLA/PE) because of the morphology attained. However, it was found that a relationship exists between the improvement of the compatibility and the loss of the thermal stability (−28°C) in PLA/HDPE blends. POLYM. ENG. SCI., 54:522–530, 2014. © 2013 Society of Plastics Engineers

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