Blending PLA(Poly-lactic acid) with layered silicates



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Layered silicates are used for organic/inorganic hybrid fillers to reinforce the polymers. Dispersion of polymer and layered silicate is important because phase separation leads to weak interaction which makes poor property at polymer-layered silicate nanocomposites.
In this work, PLA(Poly-lactic acid) is synthesized from cyclic L-lactide with layered silicates through in-situ ring opening reaction with varying concentrations of layered silicate. PLA is an attractive biomaterial and is used for packaging due to high strength and high-modulus properties. Its shortcomings such as barrier property, brittleness can be enhanced by mixing it with organic modified layered silicate. The polymer-layered silicate nanocomposites are characterized by x-ray diffraction, thermal gravimetric analysis and optical microscopy. In this work, intercalated or exfoliated polymer layered silicate nanocomposites could be achieved. The analysis of samples shows that crystallinity is decreased with increasing inorganic concentration. In addition, thermal stability and morphology also depend on dispersibility and inorganic concentration.



Polymer blends, PLA, layered silicate, Exfolited, Intercalation, Thermal stability, Morphology, X-ray diffraction, Sonication