Compatibility Enhancement of the Polylactic Acid/Polystyrene Immiscible Blend Using Reactive Graphene.

Area of Science:

• Materials Science
• Polymer Science
• Nanotechnology

Background:

• Graphene as an additive can improve composite properties by stabilizing morphology in bicontinuous blends.
• Selective localization of graphene can create novel porous materials and reduce percolation thresholds.
• Understanding graphene's interaction with immiscible polymer blends is crucial for advanced material development.

Purpose of the Study:

• To investigate the effect of reactive graphene on the morphology and properties of immiscible polystyrene/polylactic acid (PS/PLA) blends.
• To determine if reactive graphene can stabilize the bicontinuous structure of PS/PLA blends.
• To assess the impact of reactive graphene on the electrical conductivity and rheological behavior of the PS/PLA system.

Main Methods:

• Utilized transmission electron microscopy (TEM) and scanning electron microscopy (SEM) to observe blend morphology.
• Performed dynamic rheological measurements to analyze the elastic properties of the composites.
• Investigated the formation and recovery of conductive networks using electrical conductivity measurements.

Main Results:

• Reactive graphene selectively localized at the PS/PLA interface, stabilizing the morphology during static annealing.
• The addition of reactive graphene significantly enhanced the elastic properties of the PS/PLA blend.
• A percolated conductive network was formed by reactive graphene, exhibiting significant recovery after microstructural disruption.

Conclusions:

• Reactive graphene effectively stabilizes the morphology of immiscible PS/PLA blends by interfacial localization.
• The incorporation of reactive graphene imparts significant improvements in elastic properties and electrical conductivity.
• This study demonstrates the potential of reactive graphene as a multifunctional additive for creating advanced polymer composites with tunable properties.