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Contribution of Catalytic Transesterification Reactions to the Compatibilization of Poly(lactic acid)/Polycarbonate Blends: Thermal, Morphological and Viscoelastic Characterization

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Abstract

Samarium acetylacetonate (Sm-Acac) was added to catalyze interchange reactions between poly(lactic acid) (PLA) and polycarbonate (PC) in order to promote compatibilization and enhance the performances of the PLA/PC blend. The effects of the composition and catalyzed transesterification reactions were investigated using differential scanning calorimetry (DSC), thermogravimetry (TG), dynamic mechanical thermal analysis (DMTA) and scanning electron microscopy (SEM). DMTA and DSC analysis revealed the immiscibility of the uncatalyzed PLA/PC blends for the studied compositions because the glass transition temperatures of PC and PLA were unchanged after blending. In the PLA glassy region, PLA/PC blends exhibited lower storage moduli which increased upon heating due to the cold crystallization process. During melt mixing with Sm-Acac catalyst, PLA/PC blends were submitted to two competing processes. In one hand, Sm-Acac acted as a plasticizer and contributed in decreasing significantly the glass transition, crystallization and melting temperatures of PLA phase. In the other hand, Sm-Acac proved its efficiency in catalyzing the transesterification reactions that were evidenced by the decrease of the PLA aptitude to crystallization due to the hindering effect of the PC units inserted into the PLA chains. PLA/PC blends melt mixed with 0.25% of Sm-Acac showed a significant strengthening effect, corresponding to an increase in the storage modulus in the temperature range comprised between 70 and 90 °C. This indicated the formation of a copolymer at the interface and the promotion of adhesion as it is confirmed from the decrease in the height of the PLA Tan δ peak. At 0.5% of Sm-Acac, (90/10) PLA/PC blend revealed a new peak assigned to the glass transition of the PLA-PC copolymer, whereas the (50/50) PLA/PC blend was converted into a new random copolymer. TG analysis proved the presence of a copolymer structure presenting an intermediate thermal stability in both the catalyzed and uncatalyzed blends.

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Authors and Affiliations

  1. Laboratoire de Physico-Chimie des Hauts Polymères (LPCHP), Département de Génie des Procédés, Faculté de Technologie, Université Ferhat ABBAS Sétif1, Sétif, Algeria

    Nadjat Chelghoum, Melia Guessoum & Nacerddine Haddaoui

  2. Centre d’Etudes et de Recherche en Thermique, Environnement et Système (CERTES EA-3481), Université Paris Est Créteil, Créteil, France

    Magali Fois

Authors
  1. Nadjat Chelghoum
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  2. Melia Guessoum
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  3. Magali Fois
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  4. Nacerddine Haddaoui
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Correspondence to Melia Guessoum.

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Chelghoum, N., Guessoum, M., Fois, M. et al. Contribution of Catalytic Transesterification Reactions to the Compatibilization of Poly(lactic acid)/Polycarbonate Blends: Thermal, Morphological and Viscoelastic Characterization. J Polym Environ 26, 342–354 (2018). https://doi.org/10.1007/s10924-017-0950-4

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  • DOI: https://doi.org/10.1007/s10924-017-0950-4

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