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Synergistic Effect of P[MPEGMA-IL] Modified Graphene on Morphology and Dielectric Properties of PLA/PCL Blends

To investigate the combined effect of graphene (Gra) and poly(methoxy poly(ethylene glycol) monomethacrylate-co-1-vinyl3-ethylimidazolium bromide) (P[MPEGMA-IL]) on the morphology, crystallization behavior and dielectric properties for polylactide (PLA)/poly(-caprolactone) (PCL) blends, a series of PLA/PCL blend based composites have been prepared using solution-cast method. The P[MPEGMA-IL] modified Gra could be mainly localized in the PCL domains, and improved the dispersibility of PCL phase in the composites. Due to the heterogeneous nucleation of Gra and ion cluster of P[MPEGMA-IL], the crystallinity of PLA and PCL were improved simultaneously with the increase of modified Gra content. The good conductivity of Gra and the better dispersion of PCL made the PLA/PCL blends with higher dielectric permittivity owing to the increase of the mobile charge carriers at the interfaces.