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Combination effects of reinforcing filler and impact modifier on the crystallization and toughening performances of poly(lactic acid)

2020; Budapest University of Technology and Economics; Volume: 14; Issue: 9 Linguagem: Inglês

10.3144/expresspolymlett.2020.70

1788-618X

Nawadon Petchwattana, Phisut Naknaen, Benjaporn Narupai,

Natural Fiber Reinforced Composites

In this research, poly(lactic acid) (PLA) was toughened and improved the crystallinity by rubber particles and inorganic filler.CaCO 3 was employed as a filler and nucleating agent while poly(methyl methacrylate)-poly(butadiene-styrene) (MBS) core-shell impact modifier was added as a toughening agent.Overall, the enhancements of both the toughness and crystallization of PLA with CaCO 3 and MBS were successfully achieved.The tensile modulus and strength of PLA increased with increasing CaCO 3 content from 10 to 30wt%.However, they decreased slightly when CaCO 3 loading reached 40 wt% due to particles agglomerations.With the addition of MBS rubber, the tensile modulus and strength of the PLA/CaCO 3 composites became lower than those observed for PLA/CaCO 3 composites due to the softening effect.Furthermore, the compositions with MBS showed superior toughness in terms of the tensile elongation at break and impact strength.CaCO 3 nucleated the PLA crystal which reflected as the increase in the degree of crystallinity (X c ) by at least 2 times for all formulations studied.The crystallization half-time (t 1/2 ) of PLA with 40 wt% CaCO 3 was dramatically reduced, from 26 min, in neat PLA, to 0.9 min.With the addition of MBS, it did at 2.7 min for the same CaCO 3 content.The maximum increment of heat distortion temperature (HDT), around 8 °C, was found for the PLA with 20 wt% CaCO 3 .