| 초록 |
Novel biodegradable aliphatic polyester (APES)/thermoplastic starch (TPS) /organoclay ternary nanocomposites were prepared through melt intercalation method. Cloisite 30B with ammonium cations located in the silicate gallery were chosen in the nanocomposite preparation. The dispersion of the silicate layers in the APES/TPS hybrids was characterized by using Wide Angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM). Tensile, thermal stability, and barrier properties of these clay hybrids were also studied. The results showed that adding organoclay to the APES/TPS blend systems is favorable to improve the tensile strength and barrier properties of these hybrids. The influences of the polar interaction between the TPS, APES, and the silicate layers of organoclays were also investigated by incorporating ionomer, poly ethyleneco-vinyl alcohol (EVOH), or poly (ethylene-co-acrylic acid) (PEAA) as a compatibilizer. It was shown that the addition of ionomer improved the compatibility between TPS and APES, and the storage modulus of the hybrid with ionomer was improved in comparison to that without the compatibilizer. The influences of ionomer or PEAA addition on the dispersion of organoclays in the APES and TPS matrix was interpreted in terms of the interaction between carboxyl end groups of ionomer or PEAA and hydroxyl group of TPS.
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