The effect of natural fiber loading on the mechanical, thermal, impact, and water absorption properties of natural fiber composites consisting of recycled polypropylene (r-PP) as matrix and bamboo fiber (BF) and kenaf fiber (KF) as reinforcements was investigated in this study. BF/r-PP and KF/r-PP c...
The effect of natural fiber loading on the mechanical, thermal, impact, and water absorption properties of natural fiber composites consisting of recycled polypropylene (r-PP) as matrix and bamboo fiber (BF) and kenaf fiber (KF) as reinforcements was investigated in this study. BF/r-PP and KF/r-PP composites with different fiber loadings were produced by extrusion and injection molding processes, respectively. The tensile modulus, flexural modulus, flexural strength, heat deflection temperature and dynamic mechanical properties of KF/r-PP composites were higher than those of BF/r-PP composites. The result informs that the loading of kenaf fiber longer than bamboo fiber plays an effective role in improving the mechanical and thermal properties of KF/r-PP composites, compared to BF/r-PP composites, due to the aspect ratio of KF higher than BF. Also, with 40 wt% KF the highest flexural properties were obtained and the flexural modulus was highly increased about 7 times, compared to that of r-PP. The impact strength of both BF/r-PP and KF/r-PP composites was decreased with increasing the fiber loading. The fractured surfaces revealed that the interfacial bonding between the reinforcing fiber and the r-PP matrix was poor, due to different characters between hydrophilic natural fiber and hydrophobic r-PP matrix, indicating the necessity of appropriate surface treatment to increase the interfacial adhesion between the reinforcing natural fiber and the recycled polymer matrix. The water absorption of BF/r-PP and KF/r-PP composites was increased with water immersion time and fiber loading. KF/r-PP composites exhibited water absorption higher than BF/r-PP counterparts, due to kenaf fibers, which can be exposed to a long pathway of water absorption. The tensile and flexural properties of BF/r-PP and KF/r-PP composites after water immersion test were similar to those before water immersion test or slightly decreased with the immersion time, depending on the natural fiber and the loading, with an exception of KF/r-PP composite. The tensile strength of BF/r-PP and KF/r-PP composites after water immersion was rather increased, due probably to a natural fiber swelling effect.
The effect of natural fiber loading on the mechanical, thermal, impact, and water absorption properties of natural fiber composites consisting of recycled polypropylene (r-PP) as matrix and bamboo fiber (BF) and kenaf fiber (KF) as reinforcements was investigated in this study. BF/r-PP and KF/r-PP composites with different fiber loadings were produced by extrusion and injection molding processes, respectively. The tensile modulus, flexural modulus, flexural strength, heat deflection temperature and dynamic mechanical properties of KF/r-PP composites were higher than those of BF/r-PP composites. The result informs that the loading of kenaf fiber longer than bamboo fiber plays an effective role in improving the mechanical and thermal properties of KF/r-PP composites, compared to BF/r-PP composites, due to the aspect ratio of KF higher than BF. Also, with 40 wt% KF the highest flexural properties were obtained and the flexural modulus was highly increased about 7 times, compared to that of r-PP. The impact strength of both BF/r-PP and KF/r-PP composites was decreased with increasing the fiber loading. The fractured surfaces revealed that the interfacial bonding between the reinforcing fiber and the r-PP matrix was poor, due to different characters between hydrophilic natural fiber and hydrophobic r-PP matrix, indicating the necessity of appropriate surface treatment to increase the interfacial adhesion between the reinforcing natural fiber and the recycled polymer matrix. The water absorption of BF/r-PP and KF/r-PP composites was increased with water immersion time and fiber loading. KF/r-PP composites exhibited water absorption higher than BF/r-PP counterparts, due to kenaf fibers, which can be exposed to a long pathway of water absorption. The tensile and flexural properties of BF/r-PP and KF/r-PP composites after water immersion test were similar to those before water immersion test or slightly decreased with the immersion time, depending on the natural fiber and the loading, with an exception of KF/r-PP composite. The tensile strength of BF/r-PP and KF/r-PP composites after water immersion was rather increased, due probably to a natural fiber swelling effect.
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