Preparation and Piezocatalytic Properties of the High-crystallinity Polyporous Polylactide Powder
As a bio-based and biodegradable piezoelectric polymer material,polylactide(PLA)could play an essential role in organic wastewater treatment and tissue remediation/regeneration.However,PLA suffers from low piezo activity and piezo response,which greatly hinders its practical applications.To address these drawbacks,this work prepared a porous stereocomplex PLA(SC-PLA)powder with high crystallinity by the low-temperature melt blending of poly(L-lactic acid)(PLLA)and poly(D-lactic acid)(PDLA),Sodium bicarbonate(NaHCO3)was used as the foaming agent.Effects of NaHCO3 loading on the microstructures and piezocatalytic properties of the powder were investigated.The results show that the addition of NaHCO3 does not affect the crystallinity(approximately 40%)and morphologies of SC-PLA powder,but imparts the SC-PLA powder with abundant micro-porous structures that could enhance the powder deformability under external stress.Ultimately,the SC-PLA powder shows excellent piezoelectric properties.The loading of a30%massfraction NaHCO3 could increase the SC-PLA powder porosity from 8.9%to66.9%,and increase the open-circuit voltage from 4.0 V to 22.0 V.Piezocatalytic experiments reveal that such electroactive porous SC-PLA powder could mediate the generation of reactive oxygen species(ROS)under the ultrasonic vibration,efficiently catalyzing the degradation of organic dyes.The degradation rate of indigo carmine reaches as high as 93.2%.
万方数据
维普
