Mechanism of Reactive Compatibilization of PLLA/PVDF Blends Investigated by Scanning Transmission Electron Microscopy with Energy-Dispersive X-ray Spectrometry and Electron Energy Loss Spectroscopy AITranslate

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DOI：https://doi.org/10.1021/acsapm.9b00061

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The localization of reactive compatibilizers at the interfaces in polymer blends of PLLA (poly(l-lactic acid)) and PVDF (poly(vinylidene fluoride)) was investigated by scanning transmission electron microscopy (STEM) combined with energy-dispersive X-ray spectrometry (EDX) and electron energy loss spectroscopy (EELS). Polyhedral oligomeric silsesquioxane (POSS) functionalized with epoxide groups and poly(methyl methacrylate) (PMMA) chains was applied as compatibilizer in the immiscible PLLA/PVDF (50/50 wt %) blend. The blends were successfully compatibilized by adding the functionalized POSS through the chemical reaction of epoxide group with PLLA and the dissolution of PMMA into PVDF phase. The localization behaviors of the POSS compatibilizers at the PLLA/PVDF interfaces, which were influenced by melt-blend conditions, were characterized by EDX elemental analysis. We also investigated the local chemical structures in the interfacial regions by energy-loss near edged fine structure in EELS. We proposed the mechanism of the reactive compatibilization of immiscible polymer blends by the STEM-EDX/EELS analysis of the PLLA/PVDF interfaces compatibilized with the POSS derivatives.