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In order to improve the thermal properties of polylactic acid(PLA) filament,nano-SiO_2 was applied to mix with PLA,then they were spun as composite filament by melt-spinning.The dispersion of nano SiO_2 and the fracture surfaces of filaments were studied by scanning electron microscopy(SEM).The properties of composite filament,such as orientation degree,mechanical properties,and surface friction properties,were analyzed.The thermal performances of composite filament were analyzed by differential scanning calorimetry(DSC) and thermo gravimetric analysis(TGA).The results showed that the nano-SiO_2 modified by 5% KH-550 could disperse evenly and loosely in nano-scale,and 1 wt% and 3 wt% nano-SiO_2 dispersed throughout PLA evenly.As the quantity of nano-SiO_2 increased,the properties of composite filament,such as orientation degree,friction coefficient,thermal decomposition temperature,and glass transition temperature,increased more or less.The breaking tenacity increased when 1 wt% SiO_2 was added in PLA,but declined when 3 wt% SiO_2 was added.
In order to improve the thermal properties of polylactic acid (polylactic acid), the dispersion of nano SiO 2 and the fracture surfaces of filaments were studied by scanning electron microscopy (SEM). The properties of orientation, mechanical properties, and surface friction properties, were analyzed. differential scanning calorimetry (DSC) and thermo gravimetric analysis ( TGA). The results showed that the nano-SiO 2 modified by 5% KH-550 could disperse evenly and loosely in nano-scale, and 1 wt% and 3 wt% nano- Friction coefficient, thermal decomposition temperature, and glass transition temperature, increased more or less. The breaking tenacity increased when 1 wt% SiO 2 was added in PLA, but declined when 3 wt% SiO_2 was added.