Title: MECHANICAL AND THERMAL PROPERTIES OF POLY(LACTIC ACID)/STARCH/ MONTMORILLONITE BIODEGRADABLE BLENDS
Page Range: p.633-638
Author(s): Jie Ren; Zichao Liu; Tianbin Ren
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 15
Issue No: No.8
Abstract
Biodegradable blends of poly(lactic acid) (PLA), starch, and montmorillonite (MMT) were prepared in a twin-screw extruder and the effects of MMT content on the mechanical and thermal properties of the blends were studied. The microstructure of the composites was examined by means of wide-angle X-ray diffraction and transmission electron microscopy. The blends had a stacked and intercalated/flocculated structure. Blends of PLA and starch with MMT showed a lower crystallisation temperature than those lacking MMT, suggesting that MMT facilitates the crystallisation of PLA. The melting temperature of PLA was not significantly affected by the addition of MMT. The blends had a high tensile strength of approximately 40 MPa and a high flexural strength of approximately 80 MPa. The maximum tensile and flexural strengths were obtained at an MMT content of 2 wt%. The absorption of water by blends containing MMT was lower than those lacking MMT. 25 refs.
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