Effects of hemicellulose extraction and extrusion parameters on the properties of hemicellulose based polymeric materials obtained from different lignocellulosic biomass

Erdemir, Duygu
There is growing interest worldwide in utilization of renewable sources for fuels, materials and chemicals due to depletion of fossil sources and the environmental damages of synthetic products. Lignocellulosic biomass is the most promising material to become a substitute for fossil sources because of its abundancy in nature, low price and utilization area which does not compete with the food. Biodegradable films can be produced from hemicellulosic part of biomass and their main use can be especially food packaging due to their low oxygen permeability. In this study, hemicellulose is extracted from corn cobs and cotton stalk by alkaline extraction and extrusion process was utilized for the production of hemicellulose based materials. Within the context of this study, alkali extraction (particle size of the corncobs, extraction time, alkaline concentration and boron compound addition) and extrusion (extrusion temperature and screw speed) parameters were investigated and compared in terms of films mechanical, thermal and morphological properties. The best conditions in the range tested, were found as 1.19 - 0.6 mm particle size corn cobs, 1 h of extraction time with 15% KOH and no boron compound addition. The tensile strength of about 80 MPa and the elongation at break of 48% were obtained for the corn cob based extruded strips. The tensile strength of about 91 MPa was obtained for the solvent casted cotton stalk films. These mechanical properties suggest that the solvent casting was a suitable method for the cotton stalk hemicellulose while the extrusion was more convenient method for the corn cob hemicellulose.


Effect of Conditioning Time and Temperature on the Volumetrics and Stability of Dry Process Crumb Rubber Modified Warm Asphalt Mixtures
Öztürk, Hande Işık (2017-11-17)
Environmentally friendly techniques for asphalt mixtures are developed for greater savings in natural resources, energy and economy. This paper focuses on the association of: i) Warm Mix Asphalt (WMA) ii) Dry Process Crumb Rubber (DryCR). WMA is a widely used technology that allows significant reduction in the mixing temperature (MT) and compaction temperature (CT) of the asphalt mixtures. Additionally, they have various acknowledged engineering, environmental and economic benefits. Similarly, CR modificati...
Impact of Urban Street Network on BIPV Generation Capacity of Buildings
Duran, Ayca; Akgül, Çağla; Gürsel Dino, İpek (2022-10-11)
Climate change necessitates a critical reconsideration of the built environment since buildings are among the top fossil fuel consumers. Solar energy generation through building integrated photovoltaic (BIPV) systems is one of the most common onsite energy generation methods. However, many factors regarding urban morphology can negatively affect BIPV generation. Urban block typologies and spatial patterns are commonly studied descriptive metrics of an urban morphology that affect the solar energy potential....
Koç, Melodi Neşe; Oğuz, Elif; Department of Civil Engineering (2022-5-06)
Renewable energy is becoming a popular research topic over the last decades. The floating wind turbine system consists of a typical wind turbine with a platform that the tower of the turbine is implemented. One of the popular floating systems is known as Tension Leg Platforms (TLPs). In this study, TLP is chosen due to the limiting nature of the system in terms of heave, roll and pitch motions. Due to the complexity of the system, coupling analysis of TLPs become important. In this thesis, a benchmark study...
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 ...
Film fabrication using corncob as lignocellulosic biomass
Ergün, Eylül Gökçe; Çulfaz Emecen, Pınar Zeynep; Bölükbaşı, Ufuk; Department of Chemical Engineering (2014)
Renewable biopolymer resource, lignocellulosic biomass, has emerged as an alternative raw material to petroleum-based resources for the sustainable production of materials, fuels and chemicals. In this study, the main focus was to constitute a novel and eco-friendly process to fabricate films from low value lignocellulosic agricultural residues in the absence of any additional film-forming compounds. In this scope, raw lignocellulosic biomass, namely corn cobs, was turned into films using the ionic liquid 1...
Citation Formats
D. Erdemir, “Effects of hemicellulose extraction and extrusion parameters on the properties of hemicellulose based polymeric materials obtained from different lignocellulosic biomass,” M.S. - Master of Science, Middle East Technical University, 2015.