Waste derived biochar as an alternative filler in biocomposites - mechanical, thermal and morphological properties of biochar added biocomposites

Abstract This study investigated the potential of using waste derived biochar as an alternative filler to manufacture biodegradable non fossil derived biocomposites. Two types of biochars, i.e. (1) wood and (2) sewage sludge derived biochars were used as fillers in Polylactic acid (PLA) and BIOPLAST GS2189 biocomposites with the loading rate up to 20% (by weight). The laboratory manufactured testing samples of these biocomposites were subject to the following tests: water adsorption, tensile strength, impact strength, differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and optical and SEM microscopy. The results showed that the addition of biochar had the effect on all the investigated parameters, including mechanical, thermal and optical properties. Biochar added biocomposites showed higher water absorption and rigidity. Sewage sludge derived biochar as a filler for biodegradable polymers resulted in better mechanical and thermal properties of the investigated biocomposites. The biochar added biocomposites can be successfully used to produce agricultural accessories such as clips and supports for growing plants, e.g. tomatoes. After harvesting the plants these biodegradable accessories can be disposed of with plant residues and treated through composting. Thus, preventing from generation of plastics waste from agriculture that are difficult to managed.