In the face of synthetic polymersside effects on the environment, the use of bio-based and eco-friendly polymers has been considered more than ever. Among the bio-polymers, Starch is anatural polysaccharide that can be derived from renewable and inexpensive resources. Because of its low mechanical and physical properties and hydrophilic nature, It has not employed in pristine for fabricating packaging films in industrial-scale. Therefore, starch is blended with synthetic or other bio-polymers to make eco-friendly films. In this study, starchmatrix. Due to oxygen permeability importance in packaging films, nano clay was added to LLDPE/TPS composite. Since, the clay plate dispersion plays a key rule on improvement of mechanical and physical properties of nano composite, POE-g-IA based on biomonomer itaconic acid and POE-g-MA based on synthetic monomer maleic anhydride was used. In addition, Melt grafting reaction was used for the preparation of the functionalized poly ethylene- octene elastomer. Moreover, to identify functional groups in POE molecular structure, the grafting degree and ATR-FTIR analysis were performed for the prepared samples. Thedispersion and interfacial adhesion of starch and nano clay to the LLDPE matrix were evaluated by tensile, falling weight, XRD, FE-SEM, and TEM tests. XRD results showed that, the d-spacing of nano clay plate was increased with POE-g-IA incorporation. Considering, the d-spacing of the nano clay plate was alerted from 17.24 A o for POE-g-MA to 18.14 A o for POE-g-IA. Furthermore, morphological tests revealed that incorporation of the functionalized POE improved the interfacial adhesion of nano clay/LLDPE and starch/LLDPE. On the other hand, TEM images confirmed, POE-g-IA more exfoliated the nanoclay d-spacing in comparison with POE-g-MA. The evaluation of the mechanical properties of nano-composites showed that POE-g-IA improved tensile strength, young modulus, elongation at break and dart impact of LLDPE/ TPS/ nano clay-composite, respectively 8.55%,5.00%, 11.50%,7.40% more than POE-g-MA. Since the better dispersion of nano clay plate with POE-g-IA, the oxygen gas permeability decreased by 13.94% in comparison with another functionalized POE.
