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Bark polyflavonoids from Pinus radiata as functional building-blocks for polylactic acid (PLA)-based green composites

By D. E. Garcia, J. C. Carrasco, J. P. Salazar, M. A. Perez, R. A. Cancino and S. Riquelme

Abstract

Polylactic acid (PLA) was melt-blended with Pinus radiata unmodified and modified (hydroxypropyled) bark polyflavonoids in order to use such polyphenolic building-blocks as functional additives for envisaged applications. Rheological, morphological, molecular, thermal, and flexural properties were studied. Polyflavonoids improved blend processability in terms of short-time mixing. Furthermore, hydroxypropylated polyflavonoids improve miscibility in binary and ternary blends. Blend-composition affects crystallization-, melting-, and glass transition-temperature of PLA, as well as thermal resistance, and flexural properties of the blends. Polyflavonoids induced PLA-crystallization, and polymer-chain decomposition. Modified and unmodified bark polyflavonoids from radiata pine can be used successfully in PLA-based green composites beyond the food-packaging applications. The high compatibility between PLA and hydroxypropyled polyflavonoids highlights the potential of such phenolic derivatives for PLA-based material design

Topics: Polymer composites, Biopolymers, Material testing, Materials of engineering and construction. Mechanics of materials, TA401-492, Chemical technology, TP1-1185
Publisher: Budapest University of Technology
Year: 2016
DOI identifier: 10.3144/expresspolymlett.2016.78
OAI identifier: oai:doaj.org/article:36344c37f87741d9a6caa866c35ed508
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