Conductivity via Continuous Polymer Blends: A Little Graphene Goes a Long Way

Seminars
14.01.2018
14:30
David Wang Auditorium, 3rd floor Dalia Maydan Bldg.
Prof. Chris Macosko

Prof. Chris Macosko

Department of Chemical Engineering and Materials Science University of MInnesota 421 Washington Ave Minneapolis, MN 55455 macosko@umn.edu

Conductive polymer composites have been developed for electrostatic discharge and electromagnetic interference shielding.
Loadings of >10% conductive fillers are typically required, but such loading levels result in high melt viscosity, poor appearance, contamination by sloughed off fillers and high material cost.
We have found that small amounts of graphene nanoplatelets, 0.06 wt%, if located at the interfaces in a cocontinuous polymer blend can percolate resulting in useful conductive composites.
We will show how wetting properties as well as the kinetics of graphene movement during melt mixing can help to explain graphene jamming in the interfaces.

Presented in cooperation with the Interdepartmental Program in Polymer Engineering.