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Characterization of Biochar Sourced from Lignin Used to Tune the Electrical
and Mechanical Properties of Biodegradable Polymer Blends
Seth KaneJesse Arroyo, Stephan Warnat, Cecily Ryan
Biochar & BioenergyJuly 3, 2019
PLA
PHBV
Carbon Black
e-PLA
PHBV
Biochar
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Motivation
https://www.epa.gov/smm/sustainable-materials-management-basicshttps://www.epa.gov/smm/sustainable-materials-management-basics
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MotivationComposite materials allow for the
tuning of material properties to the desired application
Composite materials are not commonly recycled
Nanofilled composites enable the creation of electrically semi-conductive materials
https://www.rockwestcomposites.com/
Ryan Lab Group, Unpublished 2019
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Why add biochar to bioplastics?3D printable, biodegradable, electrically
semi-conductive plastics!
Promising alternative to carbon black
Beneficial at end of life
https://www.blackmagic3d.com/
Biochar from lignin
Carbon black Vulcan XCMAX22
Arroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
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Why use a lignin sourced biochar?Waste product
High percentage carbon
https://en.wikipedia.org/wiki/LigninRyan Lab Group, Unpublished 2019
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Biodegradable polymersPoly(3-hydroxybutyrate-co-3- hydroxyvalerate) (PHBV)
Ryan Lab Group, Unpublished 2019
Polylactic acid (PLA)
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Why use a polymer blend?
Ryan, C., Unpublished, 2018
Nanofiller
occupies A or B
Nanofiller
localizes to A
Nanofiller
localizes to B
Nanofiller localizes
to interfaceArroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
PLA
PHBV
Nanofiller
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PHBV
PLA
Nanofiller
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Why use a polymer blend?
Ryan, C., Unpublished, 2018
Nanofiller
occupies A or B
Nanofiller
localizes to A
Nanofiller
localizes to B
Nanofiller localizes
to interfaceArroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
PLA
PHBV
Nanofiller
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PHBV
PLA
Nanofiller
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Why use a polymer blend?
Below c At/Above c
Percolation threshold c
Onset of connectivity
Add nanofiller
Change blend ratio
e-
e-
Ryan, C., Unpublished, 2018
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Why use a polymer blend?
Below c At/Above c
Percolation threshold c
Onset of connectivity
Add nanofiller
Change blend ratio
e-
e-
Ryan, C., Unpublished, 2018
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Arroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
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Arroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
Challenges for composite processing
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Research ObjectivesCharacterize the reaction occurring between biochar and biodegradable
polymers
Investigate how this reaction might be mitigated or eliminated via different sourcing or preprocessing
Characterize properties of resulting composite
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Biochar Production VariablesFeedstocks:
Ryan Lab Group, Unpublished 2019
Ryan Lab Group, Unpublished 2019
Pretreatment:Ball milled to ~1-10 µmDried at 110°C for >24 hrs
Alkaline Lignin Dealkaline Lignin Wheat Stems
Alkaline Lignin Pre-milled
Alkaline Lignin Milled
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Biochar Production VariablesHighest Treatment Temperature:700 °C, 900 °C, and 1100 °C
▪ Nitrogen flow▪ Heat at 10 °C/min to HTT▪ Hold 1 hr▪ Ramp down
Ryan Lab, Unpublished 2019
Biochar Production Tube Furnace
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Thermogravimetric Analysis: PHBV and Lignin
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Differential Scanning Calorimetry: PHBV & Biochar
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Similar trends seen in TGA of PLA…
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Initial ConclusionsReduction in thermal degradation temperature responsible for the
behavior seen
Present with biochar from multiple lignin feedstocks and wheat stems
Arroyo, J., & Ryan, C. (2018). https://doi.org/10.3390/polym10121371
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Next StepsCharacterize the reaction between biochar and plastics
How can we avoid this reaction?
Characterize the properties of resulting materialElectrical conductivity, mechanical properties, life cycle analysis
Biochar in other biodegradable plastic blends
Nanofiller
localizes to
interface
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Expected SignificanceA biodegradable replacement for carbon black would be highly
desirable as the market share of biodegradable plastics increases
Long termFully biodegradable and 3D printable semi-conductive materials
https://www.blackmagic3d.com/
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