Morphological and mechanical properties dependence of PLA amount in PET matrix processed by single-screw extrusion

A. M. Torres-Huerta, D. Del Angel-López, M. A. Domínguez-Crespo, D. Palma-Ramírez, M. E. Perales-Castro, A. Flores-Vela

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

ABSTRACT: In this study, the dependence on the morphology and mechanical properties was analyzed when different amounts of polylactic acid are added to the polyethylene terephthalate polymer matrix using single-screw extrusion. Thermograms of the polymer blends obtained by differential scanning calorimetry couple to thermal gravimetric analysis show a displacement in the glass transition temperature with the amount of polylactic acid (1, 2.5, 5, and 7.5 wt%) added to the polymer matrix. Scanning electron microscopy and atomic force microscopy images showed two different kinds of morphology, both characteristics of miscible and partially miscible polymer blends. Fourier transform infrared spectroscopy measurements confirmed a physical interaction by hydrogen bond in the polymer blends. The impact resistance and tensile strength are reduced with the polylactic acid addition and are influenced by the fraction of segments of hydrogen bonded in the polyethylene terephthalate/polylactic acid blends as well as their miscibility.

Original languageEnglish
Pages (from-to)672-683
Number of pages12
JournalPolymer - Plastics Technology and Engineering
Volume55
Issue number7
DOIs
StatePublished - 2 May 2016

Keywords

  • Extrusion method
  • Mechanical properties
  • Miscibility
  • PET/PLA blends

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