Journal
BIORESOURCES
Volume 13, Issue 2, Pages 3720-3739Publisher
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI
DOI: 10.15376/biores.13.2.3720-3739
Keywords
Carbon; Biocarbon; Nano-particles; Milling; Sizing; Composite; Additives
Categories
Funding
- Competitive Green Technologies through AgriInnovation Program [052882, 051910]
- Agriculture and Agri-Food Canada
- Ontario Ministry of Agriculture, Food, and Rural Affairs University of Guelph Bioeconomy Industrial Uses Research Program [030055]
- Natural Sciences and Engineering Research Council (NSERC), Canada [401111]
- NSERC Collaborative Research and Development (CRD) [401190]
- Ontario Centres of Excellence [053035]
- Competitive Green Technologies [053036]
- Ontario Ministry of Research, Innovation and Science [052665, 052644]
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The use of biocarbon derived from renewable resources to substitute for petroleum-based carbonaceous materials in composites and other applications often requires size reduction. Biocarbon obtained by the pyrolysis of miscanthus was subjected to ball milling from 2 to 24 h. Particle analysis was performed by combining scanning electron microscope imaging and image-based particle counting. The milled biocarbon had a highly heterogeneous shape and size distribution, making image-based analysis the most suitable method. The average particle size was reduced from above 3 mu m after 2 h of milling to below 1 mu m after 24 h of milling. The specific surface area doubled from 148 m(2)/g to approximately 300 m(2)/g after 2 h of milling, but it did not change with longer milling. Ball milling caused a gradual decrease of the thermal conductivity from 0.137 to 0.116 W.m(-1).K-1. The ash content increased from 8 to 17% after 24 h of milling. Polypropylene composites filled with the biocarbon with and without ball milling showed lower density and comparable mechanical properties to a talc-filled composite except for lower impact strength. Using ball milled biocarbon led to a steady increase of the impact strength with longer milling time, reaching values on a par with that of the talc composite.
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