Evaluation of the Properties of Corn Cob Hemicellulose Based Biodegradable Films Obtained by Extrusion and Solvent Casting Methods


Akınalan Balık B., Özkan N. , Bölükbaşı U.

35th INTERNATIONAL CONFERENCE of THE POLYMER PROCESSING SOCIETY, İzmir, Türkiye, 26 - 30 Mayıs 2019

  • Basıldığı Şehir: İzmir
  • Basıldığı Ülke: Türkiye

Özet

The remarkable consumption and environmental concerns related to the utilization of fossil based resources have led researchers to focus on renewable raw materials. Lignocellulosic biomass, the fibrous part of plants with a complex matrix comprising different polysaccharides, mainly cellulose, hemicellulose and lignin, is the most abundant, inexpensive, non-starch renewable source in the world. In the present study, hemicellulose, which was obtained from corn cobs by alkali extraction method (with a yield of 30%), was used to produce biodegradable film by extrusion followed by rolling process and solvent casting techniques. The morphological, mechanical and thermal properties were investigated within these two techniques while the thicknesses of films were comparable. The effect of extrusion temperature (75, 90˚C) and screw speed (50, 100 rpm) on film properties were also investigated. Homogenous and crack free films were obtained by extrusion for all conditions. Discontinuous film formation was observed by solvent casted method even they were observed as homogenous and crack free via scanning electron microscopy. The onsets of thermal degradation temperature for solvent casted and extruded films were determined via thermal gravimetric analysis at 300°C. Increasing the extrusion temperature had a slightly positive effect on the mechanical properties of films, whereas screw speed did not have a noticeable effect (p>0.05). While the toughness of the extruded films was 13 MJ/m3, that of the solvent casted films was 5 MJ/m3. The elongation at break values of the extruded and solvent casted films were 28% and 11%, respectively.