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4707496 
Journal Article 
Evaluating corn starch and corn stover biochar as renewable filler in carboxylated styrene-butadiene rubber composites 
Peterson, SC 
2012 
Yes 
Journal of Elastomers and Plastics
ISSN: 0095-2443
EISSN: 1530-8006 
44 
1 
43-54 
WOS:000298993900002 
Corn starch, corn flour, and corn stover biochar were evaluated as potential renewable substitutes for carbon black as filler in rubber composites using carboxylated styrene-butadiene as the rubber matrix. Previous work has shown that starch-based fillers have very good reinforcement properties at the expense of brittleness in the final rubber composite. In an attempt to alleviate this, starch was blended with corn stover biochar; the biochar does not have as good reinforcement properties but makes composites that are less brittle. It was found that carboxylated styrene-butadiene rubber composites filled with 10% (by weight) corn starch or a 3:1 blend of corn starch: biochar had better reinforcement, tensile strength, elongation, and toughness than the corresponding carbon black-filled control sample. These renewable fillers therefore show good potential in replacing carbon black filler for applications utilizing more ductile styrene-butadiene rubber composites. 
particle reinforcement; rheological properties; biochar