Condensed Tannin-Based Polyurethane as Functional Modifier of PLA-Composites. Issue 8 (24th May 2018)

• Record Type: Journal Article
• Authors: García, Danny Eugenio; Salazar, Juan Pablo; Riquelme, Sebastian; Delgado, Nacarid; Paczkowski, Sebastian
• Is Part Of: Polymer-plastics technology and engineering. Volume 57:Issue 8(2018)
• Page Start: 709
• Page End: 726
• Publication Date: 2018-05-24
• Subjects: Hydroxypropyl tannin -- PLA -- polymer -- polyurethane -- radiata pine; Polymers -- Periodicals; Polymerization -- Periodicals; Polymers -- Periodicals; Engineering -- Periodicals; Plastics -- Periodicals; 668.9
• DOI: 10.1080/03602559.2017.1344855
• Languages: English
• ISSNs: 0360-2559

Abstract

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. GRAPHICAL ABSTRACT: