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

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 iso...

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Bibliographic Details
Published in:Polymer-plastics technology and engineering 2018-05, Vol.57 (8), p.709-726
Main Authors: García, Danny Eugenio, Salazar, Juan Pablo, Riquelme, Sebastian, Delgado, Nacarid, Paczkowski, Sebastian
Format: Article
Language:English
Subjects:
Bark
Biodegradable materials
Blending effects
Composite materials
Crystallization
Diisocyanates
Elasticity
Hydroxypropyl tannin
Isocyanates
Mechanical properties
Melt blending
Miscibility
PLA
Polylactic acid
polymer
Polymer matrix composites
Polyphenols
polyurethane
Polyurethane resins
radiata pine
Rheological properties
Thermal analysis
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Summary: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.
ISSN:0360-2559
1525-6111
DOI:10.1080/03602559.2017.1344855