ICNTC 2020 (International Conference on New Trends in Chemistry), Gazimagusa, Cyprus (Kktc), 17 - 18 October 2020, pp.110
Over the last decades, polymer nanocomposites have attracted attention in both academic and industrial areas. The environmental effect of polymer waste has become a major global problem because of the increase in the application of plastics. Therefore, biological based and /or biodegradable polymers with a suitable life cycle and suitable properties have become important as an alternative to conventional synthetic polymers . Biodegradability is essential for many applications, such as food packaging, drug delivery, bioabsorbable materials. Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV), a microbial bio-based polyester copolymer, is a member of the group of polyhydroxyalkanoates. By incorporation the 3-hydroxyvalerate to the poly (3-hydroxybutyrate) polymer, while the mechanical properties of the polymer improve, the melting point decreases. Thus, distortion is reduced during processing and ease of processing is provided. There are limitations in the use of PHBV due to its low mechanical, thermal and barrier properties and its fragility. It is reported that the introduction of functional additives to the polymer, the properties of PHBV can be improved and the application area of the polymer can be customized [1,2]. Inorganic materials, such as TiO2, ZnO and MgO can be used in antimicrobial applications. They are regarded as safe for human beings and animals relative to organic compounds. In addition they are stable under the high temperatures and pressures. Zinc oxide (ZnO), a promising material for a variety of applications, attracts a lot of scientific attention. It is known that zinc oxide affect not only the optical and electrical properties of polymer composites but also thermal and mechanical properties of composites [3,4]. The aim of this study is the investigation of the effect of zinc oxide on the properties of PHBV composites. Composites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and zinc oxide nanoparticles (nZnO ) were prepared by melt mixing method. A twin screw extruder was used to prepare the composites. Since solvent is not used in this method, it can be considered environmentally friendly. PHBV was kindly supplied by ADmajoris Company, France under the trade name MAJ'ECO FN000HA in a pelletized form suitable for melt extrusion. The valerate content of the PHBV reported by the company is 8% by weight. ZnO was purchased from Aldrich. A twin-screw extruder (Rondol Microlab, England) with L/D ratio 20 was used for preparing composites. ZnO percentages in PHBV/ZnO composites were 0.1 wt%, 0.5 wt%, and 1 wt%. Barrier properties of PHBV composites were determined by SYSTECH oxygen permeation analyzer. The addition of 0.5 wt% of zinc oxide increased the barrier properties by 19% compared to neat polymer. Dynamic mechanical measurements were performed on neat PHBV and composite samples to investigate the effect of the zinc oxide on their thermomechanical properties. DMA analysis informed an improvement in storage modulus and loss modulus in the presence of ZnO.