Study of the Effect of Biochar Addition to PLA on the Mechanical and Thermal Properties of 3D-Printed Samples
Subject Areas :Keyvan Hashemi 1 , Hamzeh Shahrajabian 2 , Masoud Farahnakian 3
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Keywords: Polylactic Acid, Biochar, Tensile Test, Thermal Properties ,
Abstract :
Biomass is a renewable material derived from plants and their residues, including straw husks, manure, and other organic waste. These materials contain excess carbon, such as biochar, which can be utilized in various industries to enhance efficiency, reduce production costs, and support environmental sustainability and recycling. In this study, the effects of adding biochar particles at weight ratios of 0%, 10%, 25%, and 40% to polylactic acid (PLA) were investigated in terms of tensile strength and differential scanning calorimetry (DSC) thermal analysis. X-ray diffraction (XRD) was used to identify the crystalline structure of the biochar. The results showed that increasing the biochar content significantly reduced the tensile strength of PLA. The tensile strength dropped from 56 MPa for pure PLA to 41, 14.3, and 8.5 MPa for 10%, 25%, and 40% biochar, respectively. Similarly, the tensile modulus decreased from 5.7 GPa for pure PLA to 5.1 GPa at 10%, 3.8 GPa at 25%, and 2 GPa at 40% biochar. Thermal analysis indicated that adding biochar to PLA led to a reduction in both the glass transition temperature (Tg) and melting temperature (Tm), while the degree of crystallinity increased.
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