Renewable corn flour has significant reinforcement effect in natural rubber. The corn flour
was hydrolyzed and microfluidized to reduce its particle size. Greater than 90% of the
hydrolyzed corn flour had an average size of 300 nm, a reduction of 33 times compared
to un-hydrolyzed corn flour. Compared to un-hydrolyzed corn flour composites, the composites
filled with 10–40% hydrolyzed corn flour had a significant increase in tensile
strength (29–48%), Young’s modulus (16–74%), and toughness (33–55%), but a decrease
in elongation (4–29%). The 300% modulus also increased 2–3 times. Particle agglomeration
at higher filler concentration observed by swelling study was significantly reduced after
corn flour was oxidized to introduce particle–particle repulsion with negatively charged
carboxylic acid functional groups. The oxidized corn flour was also found to interfere with
sulfur crosslinking process and behaved like a scorch retarder. Reinforcement factor at linear
viscoelastic region can be described by mechanical models for anisotropic reinforcement
elements. The aspect ratio of the reinforcement elements also decreased as the
temperature increased, indicating polymer softening within the reinforcement elements.
Renewable corn flour has significant reinforcement effect in natural rubber. The corn flourwas hydrolyzed and microfluidized to reduce its particle size. Greater than 90% of thehydrolyzed corn flour had an average size of 300 nm, a reduction of 33 times comparedto un-hydrolyzed corn flour. Compared to un-hydrolyzed corn flour composites, the compositesfilled with 10–40% hydrolyzed corn flour had a significant increase in tensilestrength (29–48%), Young’s modulus (16–74%), and toughness (33–55%), but a decreasein elongation (4–29%). The 300% modulus also increased 2–3 times. Particle agglomerationat higher filler concentration observed by swelling study was significantly reduced aftercorn flour was oxidized to introduce particle–particle repulsion with negatively chargedcarboxylic acid functional groups. The oxidized corn flour was also found to interfere withsulfur crosslinking process and behaved like a scorch retarder. Reinforcement factor at linearviscoelastic region can be described by mechanical models for anisotropic reinforcementelements. The aspect ratio of the reinforcement elements also decreased as thetemperature increased, indicating polymer softening within the reinforcement elements.
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