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Tarımsal atıklardan elde edilen hemiselüloz temelli biyopolimerlerden ekstrüzyon vasıtası ile filmlerin üretilmesi

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2014
Özkan, Necati
Bölükbaşı, Ufuk
Bahçegül, Erinç
Akınalan, Büşra
Erdemir, Duygu
Majority of materials used in daily life are produced by using petroleum based polymers. However sustainability of such production processes is problematic when it is considered that petroleum is not a renewable resource in addition to the environmental pollution caused by petroleum based products. Currently, biopolymers are more frequently utilized as an alternative to petroleum based polymers. Due to their low cost because of the waste status and abundance, lignocellulosic agricultural wastes are among the most important biopolymers. Lignocellulosic agricultural wastes are composed of cellulose, hemicellulose and lignin. Among these biopolymers, hemicellulose has a low utilization volume despite its presence in the lignocellulosic structure in considerable amounts. Films produced from this polymer are particularly suitable for food packaging applications because of their oxygen barrier properties. The aim of the current project is the production of hemicellulose based films via extrusion as an alternative to solvent casing technique, which is the main method used for hemicellulose based film production. Corn cob, wheat straw, cotton stalk and sunflower stalk, which are accumulated in large amounts in Turkey, are utilized as lignocellulosic agricultural waste resources in the project. Hemicellulose extraction from agricultural wastes was conducted at room temperature and at 60 ºC. The extrusion parameters studied were 75ºC and 90ºC together with extrusion speeds of 50 rpm and 100 rpm. Film production from all four agricultural wastes was achieved via extrusion while it was also found that extrusion enabled film production in cases where this was not possible via the solvent casting technique. Among different types of films, corn cob hemicellulose based films had the best mechanical properties with an ultimate tensile strength of 52 MPa and elongation at break of 18%.