Synthesis of PLA-g-NR by Peroxide-Induced Melt-Grafting as a Biobased Impact Modifier for Poly (Lactic Acid)
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Abstract
A toughening agent from natural rubber grafted with poly (lactic acid) (PLA-g-NR) was prepared through melt grafting technique. The weight ratio of natural rubber (NR) to poly (lactic acid) (PLA) was 2 : 1, with di-tert-butyl peroxide (DTBP) as an initiator at 0–0.5 parts per hundred parts of rubber (phr). The structure of PLA-g-NR characterized by FTIR and 1H-NMR confirmed that PLA was successfully grafted onto NR. The rheological properties of PLA-g-NR were also different from those of the unreacted PLA-NR blend, indicating the presence of grafted structures. It was also found that this grafted PLA-g-NR possessed higher resistance to thermal degradation. The blending of the synthesized toughening agents with PLA at the content of 15 wt% revealed that the use of PLA-g-NR with 0.4 phr DTBP provided better dispersion of NR with a smaller rubber domain size than that in the unmodified PLA/NR blend. This indicated better phase compatibility between NR and PLA, which also resulted in an improvement in impact strength of the blend.
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