The effect of thermoplastic starch on the properties of HDPE/TPS blends during UV-accelerated aging

Abstract

The influence of thermoplastic starch (TPS) on the properties of UV-irradiated TPS/high-density polyethylene (HDPE) blends was investigated. Changes in chemical structure, molecular weight, crystallinity, and mechanical properties, as a function of exposure time, were determined using FTIR-spectroscopy, gel permeation chromatography (GPC), differential scanning calorimetry (DSC), and tensile tests. The inclusion of TPS influence neither the evolution of carbonyl index nor the molecular weight reduction of HDPE/TPS. In contrast, the presence of TPS in the blends increased the fusion enthalpy because of starch retrogradation. This increasing resulted in a corresponding increase of Young’s modulus of HDPE/TPS blends.

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Acknowledgments

This work was supported by the Mexican Council of Science and Technology (CONACyT), Project SEP2004-C01-46045. Dr. Méndez-Hernández also thanks CONACYT for a scholarship to carry out her PhD studies. Finally, authors wish to thank J. F. Zendejo and J. Rodriguez-Velazquez for their technical support.

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Correspondence to F. J. Rodríguez-González.

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Méndez-Hernández, M.L., Tena-Salcido, C.S., Sandoval-Arellano, Z. et al. The effect of thermoplastic starch on the properties of HDPE/TPS blends during UV-accelerated aging. Polym. Bull. 67, 903 (2011). https://doi.org/10.1007/s00289-011-0501-4

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Keywords

  • Thermoplastic starch
  • Polymer blends
  • Photodegradation
  • Carbonyl index
  • Molecular weight
  • Crystallinity
  • Tensile properties