高结晶多孔聚乳酸粉末的制备及其压电催化性能  

Preparation and Piezocatalytic Properties of the High-crystallinity Polyporous Polylactide Powder

作　　者：于静 乔泽爽 史杰中 郭敏[2] 白红伟[1] 傅强[1] YU Jing;QIAO Zeshuang;SHI Jiezhong;GUO Min;BAI Hongwei;FU Qiang(College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;Sinopec Beijing Research Institute of Chemical Industry Co.,Ltd.,Beijing 100013,China)

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,四川成都610065 [2]中石化(北京)化工研究院有限公司,北京100013

出　　处：《塑料工业》2024年第8期59-65,135,共8页China Plastics Industry

基　　金：中国石油化工股份有限公司科技部项目(223089)。

摘　　要：聚乳酸(PLA)是一种生物基生物可降解的压电高分子材料,在有机污水处理、组织修复再生等领域有望发挥重要作用,但电活性低、压电响应性差等性能缺点严重限制了其实际应用。基于此,本文以碳酸氢钠(NaHCO_(3))为发泡剂,基于左旋聚乳酸(PLLA)和右旋聚乳酸(PDLA)的低温熔融共混制备高结晶的多孔立构复合聚乳酸(SC-PLA)粉末,研究了NaHCO_(3)含量对粉末微观结构与压电催化性能的影响。结果发现,NaHCO_(3)的加入对SC-PLA粉末的结晶度(约40%)和形貌均没有明显影响,但可赋予粉末丰富的微孔结构,使其在外力作用下更容易形变,进而表现出优异的压电性能。添加质量分数30%的NaHCO_(3)即可使SC-PLA粉末的孔隙率由8.9%大幅增加到66.9%,开路电压从4.0 V显著提升至22.0 V。压电催化实验表明,这种高压电性的多孔SC-PLA粉末可在超声振动激发下介导大量活性氧化种(ROS)的生成,实现对有机染料的高效催化降解(靛蓝胭脂红的降解率高达93.2%)。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(NaHCO_(3))was used as the foaming agent.Effects of NaHCO_(3)loading on the microstructures and piezocatalytic properties of the powder were investigated.The results show that the addition of NaHCO_(3)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 a 30%mass fraction NaHCO_(3)could increase the SC-PLA powder porosity from 8.9%to 66.9%,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%.

关 键 词：聚乳酸 立构复合 结晶 压电材料 压电催化 

分 类 号：TQ325[化学工程—合成树脂塑料工业]