摘要：

Aliphatic-aromatic random copolyester, poly (propylene sebacate-co-propylene isophthalate) PPSel was synthesised by a two step direct melt polycondensation method. This copolyester was characterized by solubility, viscosity measurements, IR, and thermal studies. But, to be a real alternative to classical synthetic polymers and find applications, PPSel polymer properties have to be enhanced. Synthesis of nano-biocomposites, which are obtained by incorporation of nanofillers into a PPSel matrix, is an interesting way to achieve the polymers with characteristic properties. In the present study, the nano-biocomposites were synthesized by dispersing different weight percentages(1,3 and 5%) of organo modified montmorillonite clay (OMMT) into the polyester matrix by the solvent intercalation method. The structural characterization and thermal analysis have been carried out to understand clearly the relationship between the nanofillers structure and the properties of nano-biocomposites. The X-ray diffraction patterns obtained for the systems confirmed the nanodispersion of OMMT-clay in the polyester networks. The SEMandHRTEM analyses showed that there is no phase separation between the two components which confirms the compatibility of polyester with organo-modified clay systems. An improvement in the thermal stability of nano-biocomposites of PPSel copolyester was due to the exfoliated structure of the nano-biocomposites formed. This also shows that the thermal stability is maximum when the clay content is 3 wt. %, and thus may increase the applicability of this polymer in different fields.

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