TENSILE AND WATER ABSORPTION BEHAVIOUR OFPOLYBENZOXAZINE / HEMP FIBRES COMPOSITES:EXPERIMENTAL ANALYSIS AND THEORETICAL VALIDATION

[摘要] The polybenzoxazine and alkali treated waste hemp fibres (HF) composites were preparedby isothermal heating under compression moulding process at 0.05, 0.1, 0.15, 0.2, and 0.3volume fraction HF loadings. The effects of HF loading on the tensile properties wereevaluated and compared with the estimated values of rule of mixture, series, Halpin-Tsai,and Kelly–Tyson models. The series model confirmed that the HFs have a 3D randomfibre alignment in the composites. The Kelly–Tyson model was well fitted with theexperimental found results for the tensile stress at break, while the Youngs modulus resultswere best matched with the Halpin-Tsai model predictions. Moreover, the waterabsorption increased as the HF loadings increased. The Fickian diffusion was observedduring the water absorption of the composites. SEM results illustrated that as the HFloading improved the fibre-matrix adhesion was improved.

[学科分类] 生物技术

[关键词] Bio-fibres reinforcement;Hemp fibres;Mechanical properties;Water;Absorption;Modelling