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Novel High‐Strength Thermoplastic Starch Reinforced By In Situ Poly(lactic Acid) Fibrillation

L. Jiang, B. Liu, J. Zhang
Published 2009 · Materials Science

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In recent years TPS has attracted more and more research interest as a promising replacement for commodity polymers in some applications. In this paper, a novel manufacturing technology to produce PLA fiber reinforced biodegradable TPS composite, and the microstructure and tensile properties of the composite, were first reported. PLA micro/sub-micro fibers were generated in situ by elongational flow during die extrusion and subsequent hot stretching. The addition of 10% PLA significantly increased the drawability of TPS. Compared to direct extrusion, hot stretching tripled the tensile strength of the composite to 34 MPa. Extensive PLA fibrillation was evident in the composite. The generated PLA fibers measured ca. 400 nm in diameter with a large L/D ratio.
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