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Effect of Orientation on the Morphology and Mechanical Properties of PLA/Starch Composite Filaments

✍ Scribed by Randal L. Shogren; Gordon Selling; J. L. Willett

Book ID
106422897
Publisher
Springer US
Year
2011
Tongue
English
Weight
351 KB
Volume
19
Category
Article
ISSN
1572-8900

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✦ Synopsis

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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