Properties of CNT/PLA composites based on 3D printing
Carbon nanotube(CNT)/polylactic acid(PLA)composite films were prepared by fused deposition molding(FDM)technology.The influence of the thickness on the electromagnetic shielding performance and electric heating performance of com-posite films was studied,and the performance of piezoresistive sensors based on CNT/PLA composite films was also investigated.The results showed that the electromagnetic shielding efficiency of CNT/PLA composite film with a thickness of 4 mm was 40.8 dB at a frequency of 11.4 GHz;the maximum surface temperature of CNT/PLA composite film with a thickness of 4 mm can reach 65.9℃at a voltage of 14 V,and its maximum surface temperature can be stabilized at 65.9℃for 1 000 s through contin-uously switching the voltage three times;and the prepared piezoresistive sensor had the sensitivity of 0.043 kPa-1 and 0.004 kPa-1,respectively,at pressures of 0-10 kPa and 10-100 kPa and exhibited good stability and resolution.
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