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Transesterification of poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS) blends: variations in some processing parameters

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Abstract

The effects of different processing parameters of an internal mixer connected to a torque rheometer were studied on a blend containing 70% (by wt) poly(butylene succinate) (PBS) and 30% (by wt) poly(butylene adipate-co-terephthalate) (PBAT). Different conditions were evaluated for various processing parameters, such as temperature (120, 135, and 150 °C), mixing time (3, 4.5, and 6 min), and screw rotation (50, 75, and 100 rpm). The developed blends' rheological, structural and thermomechanical properties were analyzed through tensile strength, Fourier transform infrared spectroscopy (FTIR), parallel plate rheometry, differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMTA). The response graphics for the analysis of tensile strength tests suggested that lower temperature and screw rotation would favor transesterification. The rheological results showed higher storage modulus (G') and complex viscosity (ƞ*) values for the blend processed at a lower temperature (120 °C), screw rotation (50 rpm), and extended mixing time (6 min), corroborating with previous tensile strength test results. An increase in the carbonyl groups interaction was observed by FTIR spectrum, indicating that transesterification occurred. Blends’ crystallinity presented no significant change by DSC analysis. The improved thermomechanical properties suggested that transesterification occurred due to specific processing parameters. The increase in compatibility between the polymers led to improved thermomechanical and rheological properties without any significant changes in blends’ crystallinity.

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Acknowledgements

This work was supported by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Brasil (Capes), Finance Code 001.

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Authors and Affiliations

  1. Federal Universityof São Carlos, São Carlos, SP, CEP 13565-905, Brazil

    Henrique Solowej Medeiros Lopes, Gean Henrique Marcatto de Oliveira, Thiago Henrique Silveira Maia, Carmen Greice Renda & Alessandra de Almeida Lucas

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  1. Henrique Solowej Medeiros Lopes
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  2. Gean Henrique Marcatto de Oliveira
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  3. Thiago Henrique Silveira Maia
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  5. Alessandra de Almeida Lucas
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Correspondence to Henrique Solowej Medeiros Lopes.

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Lopes, H.S.M., de Oliveira, G.H.M., Maia, T.H.S. et al. Transesterification of poly(butylene adipate-co-terephthalate) (PBAT) and poly(butylene succinate) (PBS) blends: variations in some processing parameters. Iran Polym J 32, 313–324 (2023). https://doi.org/10.1007/s13726-022-01133-w

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  • DOI: https://doi.org/10.1007/s13726-022-01133-w

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