Effect of Orientation on the Morphology and Mechanical Properties of PLA/Starch Composite Filaments |
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Authors: | Randal L Shogren Gordon Selling J L Willett |
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Institution: | (1) Plant Polymer Research Unit, National Center for Agricultural Utilization Research, USDA/ARS/NCAUR, 1815 N. University St., Peoria, IL 61604, USA;(2) Office of the Director, Midwest Area, USDA/ARS, 1815 N. University St., Peoria, IL 61604, USA |
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Abstract: | Polylactic acid (PLA)/starch fibers were produced by twin screw extrusion of PLA with granular or gelatinized starch/glycerol
followed by drawing through a set of winders with an intermediate oven. At 30% starch, fibers drawn 2–5x were highly flexible
(elongation 20–100%) while undrawn filaments were brittle (elongation 2–9%). Tensile strength and moduli increased with increasing
draw ratio but decreased with increasing starch content. Mechanical properties were better for composites made with gelatinized
starch/glycerol than granular starch. In conclusion, orientation greatly increases the flexibility of PLA/starch composites
and this may be useful not only in fibers but also possibly in molded articles. Other advantages of starch addition could
include fiber softness without added plasticizer, moisture/odor absorbency and as a carrier for active compounds. |
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