Mechanical and thermal characterisation of poly (l-lactide) composites reinforced with hemp fibres

International Symposium on Dynamic Deformation and Fracture of Advanced Materials 2013

物理学;材料科学

Shakoor, A.^1 ; Muhammad, R.^2 ; Thomas, N.L.^1 ; Silberschmidt, V.V.^2

Department of Materials, Loughborough University, Leicestershire, LE11 3TU, United Kingdom^1

Wolfson School of Mechanical and Manufacturing Engineering, Loughborough University, Leicestershire, LE11 3TU, United Kingdom^2

关键词: Dynamic thermal analysis;    Effect of strain;    FE-simulation;    Melt blending;    Poly (l-lactide);    Poly lactic acid;    Thermal characterisation;    Weight fractions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/451/1/012010/pdf
DOI  :  10.1088/1742-6596/451/1/012010

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Polylactic acid (PLA) is the most promising in the bio-derived polymer's family. But its use can be constrained by its poor mechanical properties, poor thermal stability and processing difficulties. The objective of this research is to investigate and improve mechanical and dynamic thermal properties of PLA by developing PLA composites reinforced with natural fibres (hemp). Composites were prepared by melt blending of PLA with hemp fibres. Their properties were investigated using mechanical and dynamic thermal analysis. The elastic modulus increased significantly-from 4.1 ± 0.74 to 9.32 ± 0.86 (GPA)-when the weight fraction of hemp increased from 0 to 30(wt %). The storage modulus obtained by dynamic mechanical analysis increased from 2.20 to 4.58 (GPA) for the same change in the volume fraction of hemp. FE simulation of tensile testing and DMA were carried out to investigate the effect of strain rate and temperature on the observed properties respectively. The model was developed in the commercially available code MSC Marc mentate. The model validated all experimental results.