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

Bölükbaşı, Ufuk
Özkan, Necati
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%.


Preparation of antimicrobial films from agricultural biomass
Seber, Ayşe Gizem; Bakır, Ufuk; Department of Biotechnology (2010)
Mainly used food packaging materials are petro-chemical based polymers which present environmental problems since they are not biodegradable and ecologically sustainable. In this study, biodegradable biofilms are produced from xylan, extracted from cotton stalk which is an agricultural biowaste without nutritional value. Antimicrobial property was given to the biofilms with either titanium dioxide sol-gel coatings or titanium dioxide powder addition into the biofilm forming solutions. The antimicrobial acti...
Three dimensional (3D) printing of bio-polymers from agricultural wastes
Bahçegül, Eylül Gökçe; Özkan, Necati; Şengönül, Cemal Merih; Department of Polymer Science and Technology (2022-8-8)
Lignocellulosic biomass, which is a composite structure made up of cellulose, hemicellulose and lignin biopolymers, is the most abundant biopolymer resource on earth. Among the biopolymers found in lignocellulosic agricultural wastes, hemicellulose and lignin receive significantly less attention compared to cellulose for material applications despite the fact that these two biopolymers constitute almost a half of a given biomass. In this context, three novel strategies were developed that render hemicellu...
Foamed eva-bitumen blends and composites
Çankaya, Burhan Fuat; Bayramlı, Erdal; Department of Polymer Science and Technology (2008)
The thermal conductivities of foamed polymer based materials are much lower thermal conductivity values than unfoamed polymeric materials. Especially, thermal conductivity values of foamed polymers with closed-cell structure decreases to 0.03 W/m.K. The reinforcement of foamed polymeric materials by mixing with bitumen lowers the raw material cost. The main objective of this study is to make a new thermal insulation material with low thermal conductance. In this study, the effects of concentration of calciu...
Investigation of processing parameters on production of hemicellulose based films from different agricultural residues via extrusion
Akınalan, Büşra; Bölükbaşı, Ufuk; Özkan, Necati; Department of Chemical Engineering (2014)
Today, due to the environmental concerns about petroleum based polymers, the use of renewable polymers including polysaccharides in food packaging applications is increasing rapidly. In the present study, hemicellulose was extracted from corn cobs, wheat straw and sunflower stalks, and two different techniques, solvent casting and extrusion, were utilized for biodegradable film production. Films produced from different types of biomasses were compared in terms of their mechanical, thermal and morphological ...
Sorption properties of high silica zeolites: ZSM-35 and ZSM-5
Tütüncü, Göknur; Yücel, Hayrettin; Department of Chemical Engineering (2003)
The use of high silica zeolites is widespread for numerous important processes throughout the chemical and petroleum industries. To use these zeolites in an efficient way, sorption behaviour should be understood. This study investigated how the capacities and rates of sorption on a high silica zeolite ZSM-35 changed with sorbate properties and sorbent properties at different temperatures by gravimetric method using an electrobalance. In this study also another high silica zeolite ZSM-5 was synthesized with ...
Citation Formats
U. Bölükbaşı, N. Özkan, E. Bahçegül, B. Akınalan, and D. Erdemir, “Tarımsal atıklardan elde edilen hemiselüloz temelli biyopolimerlerden ekstrüzyon vasıtası ile filmlerin üretilmesi,” 2014. Accessed: 00, 2020. [Online]. Available: https://app.trdizin.gov.tr/publication/project/detail/TVRRM09UazU.