CANCELLED: BPI SEMINAR BY DR. BORTNER

THIS EVENT HAS BEEN CANCELLED.

TITLE

Rheology Considerations for Additive Manufacturing with Nanocellulose

DATE & TIME

September 6th Tuesday 11:00 AM - 12:00 PM PDT

LOCATION

CHBE Room 202, 2360 East Mall, Vancouver, BC V6T 1Z3

ABOUT THE EVENT

Cellulose nanocrystals (CNCs) and nanofibrils (CNF) are biorenewable resources derived from the cell walls of many different biological sources and offer significant promise for a broad variety of applications, including in developing advanced materials and structures through additive manufacturing. Whether used in an aqueous suspension or as a reinforcing filler in a polymeric matrix, cellulose nanocrystals present unique rheological considerations for translation to AM processes.

In this talk, we will touch on the importance of rheological considerations for implementing CNCs into multiple AM modalities including material extrusion additive manufacturing, which encompasses direct ink write and fused filament fabrication, and material jetting. The unique properties of CNCs present interesting rheological challenges associated with each of the different modes of AM. However, these same CNC properties also offer the most exciting opportunities to develop voxel based, preferentially aligned and compositionally/functionally graded structures. 

We will touch on various aspects of aqueous CNC suspension rheology, where hydrodynamic orientation and liquid crystalline phase formation drive different process dynamics. We will also discuss CNC reinforced thermoplastic polyurethane, which enables a moisture responsive mechanically adaptive material, but with significant consideration paid to the thermal stability, corresponding chemorheology, and the interplay between thermal history and shear induced particle orientation on the dynamic modulus change.

AGENDA

• Introduction by Dr. Orlando Rojas, UBC
• Keynote Presentation by Dr. Michael Bortner, Virginia Tech
• Q&A / Discussion moderated by Dr. Orlando Rojas, UBC

ABOUT THE SPEAKER

Michael J. Bortner is an associate professor in Chemical Engineering, a Faculty Fellow in the College of Engineering at Virginia Tech, and part of the Virginia Tech Advanced Manufacturing Team (AMT) and the Macromolecules Innovation Institute (MII). His research is in the areas of polymer and composite rheology, and process-structure-property relationships.  He earned his B.S. in Chemical Engineering with a Polymer Option at Penn State, and his Ph.D. in Chemical Engineering at Virginia Tech.  Mike spent 10 years in industry focusing on manufacturing process development for novel polymer nanocomposites. His current research efforts at Virginia Tech are focused on the development of materials and process technologies, and computational methodologies, to advance the state of the art in 1) polymer-based additive manufacturing, 2) cellulose nanocrystals: production, characterization, rheology and CNC/polymer composite materials development, and 3) fiber reinforced polymer matrix composites.