Preparation And Characterization Of New Biodegradable Materials : Poly ( Lactic Acid ) / Layered Double Hydroxide Nanocomposites

The poly(l-lactic acid) (PLLA)/layered double hydroxide (LDH) nanocomposites were obtained by solution intercalation of PLLA into the PLA-COOH modified LDHs (P-LDHs) in tetrahydrofuran (THF) solution. The P-LDHs were prepared using ion-exchange reaction with various ratio magnesium (Mg)/aluminum (Al) LDHs (MgAl-LDHs). For the PLLA/LDH nanocomposites, the dispersion behaviors and physical properties of nanocomposites are characterized by wide angle X-ray diffraction (WAXD), transmission electron microscopy (TEM), dynamic scanning calorimetry (DSC) and thermogravimetric analysis (TGA). Both WAXD data and TEM images indicated that P-LDHs were exfoliated in PLLA matrix. The DSC profiles of nanocomposites indicate that exfoliated 3 wt% P-LDHs into PLLA increase the melting temperature by about 3°C. The TGA data give evidence that the thermal stability of exfoliated PLLA/LDH namocomposites were reduced by adding the P-LDHs, which is probably due to the dehydroxylation of the LDH layers and decomposition of intercalated PLA-COOH.

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