Polycarboxylated Flavonoid Oligomers as Functional Additives for Polylactic Acid-, Polystyrene-, and PolyethyleneBased Composites

GARCÍA, D.:
Proceedings, Biocomp 2016: The 13th Pacific Rim Bio-Based Composite Symposium, 22-26 (2016).

Abstract

Polylactic acid (PLA)-, polystyrene (PS)-, and polyethylene (PE)-based blends were prepared with Pinus radiata modified/unmodified bark polyflavonoids. Esterification with maleic anhydride (20 ºC, 24h) of such polyphenol was performed in order to diversify functionalities in view of envisaged applications. Rheological, morphological, thermal, and mechanical properties of the blends were studied. Polyphenols affect the processability parameters in a high extent. Polymer-matrix type affects dramatically the granule morphology, and the dimentional features of the polyflavonoid particles. On the other hand, polyphenol-composition affects the blends thermal behavior significantly. The decreasing of decomposition temperature (Td) in function of the polyphenol-content was remarkable on PLA-based blends. The mechanical properties were significantly affected by the polyflavonids-content. Polyphenols increased the elasticity modulus (E) in PS-, and PLA-based blends as described in previous works. However, polyflavonoids degrade the E-values on PE-based blends in a high extent. Bark modified polyflavonoids from radiata pine might be used successfully for the designing of functional thermoplastic composites.

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