Journal
JOURNAL OF POLYMERS AND THE ENVIRONMENT
Volume 16, Issue 1, Pages 19-26Publisher
SPRINGER
DOI: 10.1007/s10924-008-0085-8
Keywords
Sugar beet pulp; Poly(lactic acid); Composite; Extrusion; Injection-molding; Acoustic emission
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Funding
- Michelle Archdale (NCAUR Library)
- Skip Burhans (Bradley University)
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Sorbitol and glycerol were used to plasticize sugar beet pulp-poly(lactic acid) green composites. The plasticizer was incorporated into sugar beet pulp (SBP) at 0%, 10%, 20%, 30% and 40% w/w at low temperature and shear and then compounded with poly(lactic acid) (PLA) using twin-screw extrusion and injection molding. The SBP: PLA ratio was maintained at 30: 70. As expected, tensile strength decreased by 25% and the elongation increased. Acoustic emission (AE) showed correlated debonding and fracture mechanisms for up to 20% w/w plasticizer and uncorrelated debonding and fracture for 30-40% sorbitol and 30% glycerol content in SBP-PLA composites. All samples had a well dispersed SBP phase with some aggregation in the PLA matrix. However, at 40% glycerol plasticized SBP-PLA composites exhibited unique AE behavior and confocal microscopy revealed the plasticized SBP and PLA formed a co-continuous two phase system.
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