The influence of silica nanoparticles on mechanical properties of polylactic acid as food packaging material
2012
Radusin, T.I., Institute for Food Technology, Novi Sad (Serbia) | Pilić, B.M., Faculty of Technology, Novi Sad (Serbia) | Ristić, I.S., Faculty of Technology, Novi Sad (Serbia) | Bera, O.J., Faculty of Technology, Novi Sad (Serbia) | Baloš, S., Faculty of Technical Sciences, Novi Sad (Serbia) | Novaković, A.R., Institute for Food Technology, Novi Sad (Serbia)
With increasing environmental awareness around the world, the research and development of biodegradable polymers attracted a great attention. Poly(lactic acid) PLA is one of the most popular commercial biodegradable material. This unique polymer can substitute some of the mostly used conventional petroleum based polymers but some of their properties are not suitable for the application as food packaging. PLA properties can be improved by incorporation of nanoparticles into polymer matrix. The incorporation of nanoparticles into a polymer matrix creates interphases and changes the intermolecular interaction of the matrix, due to their small size and extremely high surface area. As a result, by the incorporation of only small amounts of nanofillers, a polymer nanocomposite can exhibit markedly improved physical and mechanical properties. Two different types of silica nanoparticles were used for the PLA nanocomposite preparation. Nanofiller content was varied from 0 - 2 wt. % (0, 0.02, 0.05, 0.1, 0.2, 0.5, 1 and 2 wt. %) in both nanocomposite series. Pure PLA and PLA with different nanosilica content were prepared by solution casting method in chloroform. The main goal of this work was to determine the influence of addition of different silica nanoparticles on the mechanical properties of neat polylactic acid (PLA). It was found that the low content of silica nanoparticles had positive influence on the mechanical properties of PLA polymer matrix.
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