Abstract
In order to evaluate the effect of the combination of micro-sized calcium carbonate (MCC) and nano-sized calcium carbonate (NCC) on the performance of poly(butylene adipate-co-terephthalate)/poly(lactic acid)/calcium carbonate (PBAT/PLA/CaCO3) composites by using a comparative approach, the composites were prepared by melt mixing. The melting and crystallization of the composites were investigated by differential scanning calorimetry. The non-isothermal crystallization kinetics was investigated by using Jeziorny and Mo methods. The mechanical properties of the composites were test and the fracture surfaces were observed by scanning electron microscopy. Nano and micron calcium carbonates (nano-CaCO3 and micro-CaCO3) together improved the heat resistance of the composites more effectively than them alone. Mo method indicated that the crystallization rate of the composites containing both nano-CaCO3 and micro-CaCO3 was between the nano-CaCO3 composites and the micro-CaCO3 composites. The composite containing both 5 parts nano-CaCO3 and 10 parts micro-CaCO3 had the highest tensile, yield and impact strengths among the composites, but the composite containing both 11 parts nano-CaCO3 and 5 parts micro-CaCO3 had the lowest. SEM displayed that the morphology of the dispersed PLA in the composites with both nano-CaCO3 and micro-CaCO3 was different from that in the composites with nano-CaCO3 and micro-CaCO3 alone. Controlling the ratio of nano-CaCO3 and micro-CaCO3 achieved the synergistic enhancement in PBAT/PLA/CaCO3 composites.
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This study was supported by the Scientific Project of Luohe Medical College (Grant No. 2020-LYZZHXM010 and 2019-LYZZHYB024).
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**e, J. Effect of mixing strategy on thermal and mechanical properties of poly(butylene adipate-co-terephthalate)/poly(lactic acid) incorporated with CaCO3 fillers. J Polym Res 30, 229 (2023). https://doi.org/10.1007/s10965-023-03618-5
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DOI: https://doi.org/10.1007/s10965-023-03618-5