Abstract
Investigating the compatibility mechanism of hybrid composites based on two polymers and one mineral nanofiller is a challenge that needs to be better understood. This study evaluates the effect of calcium carbonate (nCaCO3) nanoparticles as co-compatibilizers in a blend based on poly(lactic acid) (PLA), polyethylene from renewable sources (HDPE) and maleic anhydride grafting polyethylene (HDPE-g-MA or MA) using rheological and morphological analyses. Morphological assessment by scanning electron microscopy showed the formation of co-continuous-like phase morphology when nCaCO3 was added to the PLA/MA/HDPE blend, indicating that nCaCO3 affected the dispersion of PLA domains in the HDPE matrix. Rheological characterization carried out by stress relaxation and sweep frequency response analysis demonstrated that the addition of nCaCO3 improved the solid-like behavior of the blend, corroborating the morphological results. Additionally, an interaction mechanism of nCaCO3 as a co-compatibilizer was also proposed.
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Authors thank BRASKEM, CHEMTURA and LAGOS for HDPE, HDPE-g-MA and nCaCO3 donation, respectively, and CNPq for the scholarship grants.
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de Oliveira, A.G., Moreno, J.F., de Sousa, A.M.F. et al. Composites based on high-density polyethylene, polylactide and calcium carbonate: effect of calcium carbonate nanoparticles as co-compatibilizers. Polym. Bull. 77, 2889–2904 (2020). https://doi.org/10.1007/s00289-019-02887-9
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DOI: https://doi.org/10.1007/s00289-019-02887-9