Coupling of poly(lactic acid) with a polyurethane elastomer by reactive processing

Dániel Bedő, Balázs Imre*, Attila Domján, Peter Schön, G. Julius Vancso, Béla Pukánszky

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

7 Citations (Scopus)
2 Downloads (Pure)

Abstract

A segmented polyurethane elastomer (PU) was synthesized in poly(lactic acid) (PLA) melt by reactive processing. The isocyanate component was anticipated to react with the end-groups of PLA resulting in the formation of block-copolymers. The stoichiometry of the functional groups was optimized in the preliminary experiments. Two different processing methods were compared in the further experiments: conventional mixing of PU with PLA (PLA/PU), and reactive blending (PLA-b-PU). The comparison of the structure and properties of compatibilized reactive blends and conventional physical blends clearly shows the benefits of reactive processing. Coupling resulted in a finer dispersion of the particles in the matrix leading to better mechanical properties in the reactive blend. The successful synthesis of PLA-b-PU block copolymers was confirmed by NMR spectroscopy. The isocyanate component was found to react only with the hydroxyl end-groups of PLA, while the formation of amide and acylurea groups was not detected on the carboxyl end.

Original languageEnglish
Pages (from-to)409-417
Number of pages9
JournalEuropean polymer journal
Volume97
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • Diffusion-ordered spectroscopy
  • Poly(lactic acid)
  • Reactive compatibilization
  • Segmented polyurethane elastomer

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