The tensile mechanical properties of polyethylene/silica (PE/SiO2) composite fiber and three-strand PE/SiO2composite fiber ropes were investigated. It was found that the SiO2content had a significant effect on the tensile mechanical properties of composite fiber. The breaking force of the fishing three-strand PE/SiO2composite fiber rope with diameter 8 mm was 15.8 kN. Compared to common synthetic fiber rope with the same diameter, fishing three-strand PE/SiO2composite fiber rope had higher breaking force and less elongation. On the premise of maintain the breaking force, the common synthetic fiber rope could be replaced by the fishing three-strand PE/SiO2composite fiber rope in fishing area, and the linear density, the elongation at break, the netting gear resistance and using diameter of rope decreased. Therefore, an efficient method to improve the tensile mechanical properties and lower cost by using composite fiber rope was established.
The effect of the iPP content on crystallisation, dynamic mechanical relaxation behavior and mechanical properties for high density polyethylene/isotactic polypropylene (HDPE/iPP) was investigated. It was found that crystallinity of HDPE decreased while crystallinity of iPP increased with the increase of iPP content. Two relaxations, namely,γrelaxation associated with amorphous phase of HDPE andαrelaxation at positive temperature related to crystalline phase were detected, respectively.γrelaxation of HDPE/iPP blending monofilaments shifted to a higher temperature whileαrelaxation temperature remained unaffected with raising the content of iPP component. The mechanical properties were significantly affected by the iPP content. Thus, an efficient method to improve the mechanical properties of HDPE monofilaments by introducing iPP component was established.
The effects of synthesized silver nanoparticles on electrospun PHBV ultrafine fibers were studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). Addition of silver nanoparticles increased from 0.1% to 2.0%, the sooth ultrafine fiber with an average diameter of about 2 μm formed a non-woven mat was obtained. DSC showed the efficient heterogeneous nucleation by the silver nanoparticles for facilitating PHBV crystallization.The thermal stability of the PHBV/Ag ultrafine fibers improved with the increase in the content of the silver nanoparticles.
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