Effect of Dicumyl Peroxide on a Poly(lactic acid) (PLA)/Poly(butylenesuccinate) (PBS)/Functionalized Chitosan-Based Nanobiocompositefor Packaging: A Reactive Extrusion Study

摘要

Nanobiocomposites with balanced mechanical characteristics arefabricated from poly(lactic acid) (PLA)/poly(butylene succinate) (PBS)blend at aweight ratio of 80/20 in association with varying concentrations of functionalizedchitosan (FCH) through reactive extrusion at a temperature of 185 °C. Thecombined effect of FCH and dicumyl peroxide (DCP) showed insignificantchange in tensile strength with a remarkable increase in % elongation at break(～45%) values. Addition of DCP also caused increase in the molecular weight(Mw ～ 22%) of the PLA/PBS/1DFCH nanobiocomposite, which is attributed tothe cross-linking/branching effect of FCH on the polymers. The interfacialpolymer?filler adhesion is also improved, which is observed from the fieldemission scanning electron microscopy images of PLA/PBS/1DFCH. For PLA/PBS/1DFCH, the crystallization rate and nucleation density of PLA are increasedbecause of cross-linked/branched structures are developed, which acted asnucleating sites. Therefore, the present work facilitates a simple extrusionprocessing with a combination of balanced thermal and mechanical properties, improved hydrophobicity (～27%), and UV-Cblocking efficiency, which draw the possibility for the utilization of the ecofriendly nanobiocomposite in the packing of UVsensitive materials on a commercial level.