聚乳酸基纤维界面对化学聚合聚吡咯压力传感器的影响  

Effect of Interface on Polylactic Acid-based Chemically Polymerized Polypyrrole Pressure Sensors

作　　者：李丽 林烁 张伟华 刘庆华 LI Li;LIN Shuo;ZHANG Wei-hua;LIU Qing-hua(School of Chemistry and Chemical Engineering,Heze University,Heze 274015,China)

机构地区：[1]菏泽学院化学化工学院,菏泽274015

出　　处：《高分子通报》2024年第11期1628-1635,共8页Polymer Bulletin

基　　金：山东省自然科学基金(基金号ZR2022QB132,ZR2021QB203);菏泽学院博士基金(基金号XY21BS19,XY21BS18)。

摘　　要：本文通过静电纺丝法制备出了左旋聚乳酸(PLLA)、PLLA/聚吡咯(PPy)和PLLA/聚环氧乙烷(PEO)纤维膜,然后利用化学聚合法在上述薄膜表面制备导电PPy薄膜,并将上述样品制备成压阻式柔性压力传感器,研究其传感性能。研究发现,通过控制纤维的组成成分,可以调控PPy的沉积形貌及电导率,并影响传感器性能。其中,PLLA纤维膜具有强疏水性,PPy膜包覆在纤维四周或纤维间出现结膜现象,与PLLA纤维膜复合效果差,部分纤维表面上不能沉积PPy,四探针法测得其电导率仅为0.002 S/cm。PLLA/PPy纤维膜亲水性较好,可在其纤维周围形成表面光滑、连续致密的PPy膜,PPy与PLLA/PPy纤维膜的复合效果远高于PLLA纤维膜,电导率为0.51 S/cm。PLLA/PEO纤维膜亲水性最强,且PEO溶于水可增加纤维表面的粗糙度,利于吸附吡咯单体进行聚合,生成颗粒状的、连续的PPy膜,电导率为0.62S/cm。这种表面形成的颗粒状微结构提高了形变能力,制备成压阻式柔性压力传感器时的传感性能最优异。In this study,poly(L-lactic acid)(PLLA),PLLA/polypyrrole(PPy)and PLLA/poly(ethylene oxide)(PEO)fiber films were prepared by electrospinning,and conductive PPy films were prepared on the surfaces of these films by chemical polymerization.Finally,the samples were prepared into piezoresistive flexible pressure sensors to study their sensing properties.It was found that by controlling the composition of the fiber,the deposition morphology and conductivity of PPy could be regulated,and the performance of the sensor could be affected.Among them,PLLA fiber membranes have strong hydrophobicity,and conjunctival phenomena occur around or between the fibers of PPy membrane.The composite effect with the PLLA fiber membrane is poor,and PPy cannot be deposited on the surface of some fibers.The conductivity measured using the four-probe method is only 0.002 S/cm.PLLA/PPy fiber membrane has good hydrophilicity,and can form a smooth,continuous and dense PPy membrane around its fibers.The composite effect of the PPy and PLLA/PPy fiber membranes is much higher than that of the PLLA fiber membrane,with the conductivity of 0.51 S/cm.The PLLA/PEO fiber membrane has the strongest hydrophilicity,and PEO soluble in water can increase the surface roughness of the fiber,which is conducive to the adsorption of pyrrole monomer for polymerization,and the formation of granular and continuous PPy membrane with a conductivity of 0.62 S/cm.The granular microstructure formed on this surface improves the deformation ability,and the sensing performance is the best when prepared as a piezoresistive flexible pressure sensor.

关 键 词：静电纺丝膜 聚吡咯 形貌 电导率 压阻式柔性压力传感器 

分 类 号：TQ342[化学工程—化纤工业] TP212[自动化与计算机技术—检测技术与自动化装置]