聚左旋乳酸非溶剂挥发诱导成孔机制与纳米多孔纤维膜制备  

Pore⁃forming mechanism via non⁃solvent volatilization induced phase separation and porous nanofiber preparation based on poly⁃l⁃lactic acid

作　　者：张成成 刘让同[1,2] 李淑静 李亮[1,2] 刘淑萍 ZHANG Chengcheng;LIU Rangtong;LI Shujing;LI Liang;LIU Shuping(Zhongyuan University of Technology,Zhengzhou,Henan451191,China;Collaborative Innovation Center of Advanced Textile Equipment,Zhengzhou,Henan451191,China)

机构地区：[1]中原工学院,河南郑州451191 [2]先进纺织装备技术省部共建协同创新中心,河南郑州451191

出　　处：《纺织学报》2023年第10期16-23,共8页Journal of Textile Research

基　　金：国家重点研发计划项目(2017YFB0309100)。

摘　　要：为实现聚左旋乳酸纳米纤维孔隙结构可控,以氯仿和丙酮为混合溶剂,通过在聚左旋乳酸中加入柴胡,采用静电纺丝技术制备纳米多孔纤维膜。探索了非溶剂挥发诱导相分离成孔机制,研究了柴胡质量分数、溶剂配比、聚左旋乳酸质量分数对纤维膜孔隙结构的影响。结果表明:在非溶剂溶液体系中添加柴胡能够提升纤维膜的孔隙率,随着柴胡质量分数的增加,纳米多孔纤维膜的孔隙率逐渐增加,当柴胡质量分数为2%时孔隙率最大,为70.98%;改变氯仿与丙酮配比会对纤维膜孔隙结构造成影响,当氯仿和丙酮质量比为8∶1时,纤维膜的孔隙率达到最大,为82.09%;聚左旋乳酸质量分数为9%时纤维膜的孔隙率达到最大。Objective Poly L-lactic acid(PLLA)nanofiber membrane with porous fibers has excellent adsorption and filtration properties,and it is widely used in biomedicine,flexible sensors,filtration materials and other related fields.However,the preparation of the PLLA nanofibers with controllable pore structure and high porosity is still a challenge.Method With PLLA as raw material,chloroform and acetone as solvents,and bupleurum as additives,the multipored PLLA nanofibers were successfully prepared by phase separation method based on electrospinning technology.The microstructure,molecular structure and porosity of the PLLA nanofibers were characterized by thermal field scanning electron microscopy,fourier transform infrared and automatic surface and porosity analyzer.Results The surface of virgin PLLA fiber was relatively flat,with no obvious pores.When the mass fraction of bupleurum was set to 1%,2%,and 3%,a large number of pore structures appear on the fiber surface in PLLA fiber membrane,indicating that the addition of bupleurum additive greatly improves the fiber porosity(Fig.2).When the mass fraction of radix bupleurum was at 2%,the porous structure in the fiber became more obvious,and the porosity is 70.98%.Bupleurum did not participate in the change of the chemical bond of PLLA in the blending electrospinning process,and the structure of PLLA macromolecule did not change significantly,which did not affect the functional groups.The additional functional groups of bupleurum were not introduced into the PLLA fiber membrane,but affected the speed of phase separation,which was conducive to the formation of pore structure.Under the condition of keeping the mass fraction of bupleurum mass fraction at 2%,the pore structure of fiber membrane prepared with different solvent mass ratios was obvious(Fig.5).As the chloroform/acetone mass ratio was changed from 5∶1,6∶1,7∶1 to 8∶1,the fiber porosity membrane gradually increases(Tab.1).When the chloroform/acetone mass ratio was altered from 8∶1,9∶1 to 10∶1,the fiber

关 键 词：聚左旋乳酸 纳米纤维膜 静电纺丝 柴胡 多孔纤维 非溶剂溶液体系 成孔机制 

分 类 号：TQ340.64[化学工程—化纤工业]