Condensed Tannin-Based Polyurethane as Functional Modifier of PLA-Composites

Danny Eugenio García, Juan Pablo Salazar, Sebastian Riquelme, Nacarid Delgado, Sebastian Paczkowski

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Novel polylactic acid-based composites were prepared for the first time by melt-blending urethanization using bark polyflavonoids, and polymeric methyl diisocyanate. Rheological, morphological, structural, thermal, and mechanical properties were studied. Polymerization between polyflavonoids and isocyanate during the melt-blending was demonstrated by spectroscopy, confocal microscopy, and thermal analysis. Polyflavonoids improved the blend processability and affected the polylactic acid-crystallization, blend-urethanization, and flexural features. Polyphenols act as nucleating agent, and the effect was highly influenced by the polymeric methyl diisocyanate-charge, and the polyflavonoids-content. Low polymeric methyl diisocyanate-loading (10 wt%) degrades the elasticity modulus (E), while the highest polymeric (20 wt%) improved the miscibility between the polylactic acid polymer-matrix and the polyflavonoids.

Original languageEnglish
Pages (from-to)709-726
Number of pages18
JournalPolymer - Plastics Technology and Engineering
Volume57
Issue number8
DOIs
Publication statusPublished - 24 May 2018

Keywords

  • Hydroxypropyl tannin
  • PLA
  • polymer
  • polyurethane
  • radiata pine

ASJC Scopus subject areas

  • Materials Science (miscellaneous)
  • Chemical Engineering(all)
  • Polymers and Plastics
  • Materials Chemistry

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