Department of Chemistry and Biochemistry Seminar with the Materials Science Program
- Friday, November 16, 2018 at 3:10pm
- Chemistry & Biochemistry Building, Byker - view map
Dr. Cecily Ryan, Assistant Professor in the Department of Mechanical and Industrial Engineering (MSU) will present "Tailoring the Mechanical and Electrical Properties of Biopolymer Blends via the Incorporation of Carbon Nanofillers."
Biobased fillers, such as bio-derived cellulose, lignin byproducts, and biochar, can be used to modify the thermal, mechanical, and electrical properties of polymer composites. We are interested in using char from lignin and agricultural byproducts to enhance the thermal and electrical conductivities in biopolymer composites. Biochar processed from these feedstocks can potentially serve as a bioderived graphitic carbon alternative for certain composite applications. In this work, we investigate a blended biopolymer system, polyhydroxybutyrate-co-hydroxyvalerate (PHBV) with polylactide (PLA), to control the partitioning of electrically conductive nanofiller, carbon black (CB) and biochar. CB, a commonly used petroleum-derived functional nanofiller, serves as a comparison for our work on the incorporation of biochar into composites. Kraft lignin is the feedstock for the biochar. Particulate affinity for the polymer phases affects nanofiller dispersion. I will present surface energy calculations and experimental results for phase-separation and nanofiller phase affinity in this system and how that modifies the percolation behavior in a phase-separated system. I will also show our initial results for electrical conductivity and mechanical behavior of the mixed-phase nanofilled composites.
- Department of Chemistry and Biochemistry