Zhang Lishuo, Chai Wenqiang, Zhang Jiaru, Chen Zhouli, Yue Ziyang, Wang Jiayao, Yu Jiankang
College of Safety Science and Engineering, Liaoning Technical University Huludao 125105 China.
College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University Hangzhou 311121 China
RSC Adv. 2024 Feb 19;14(9):6199-6204. doi: 10.1039/d3ra08411f. eCollection 2024 Feb 14.
In this work, hierarchically porous PLA (polylactic acid) shape memory nonwovens were prepared by electrospinning its blend solution with PEO (polyethylene oxide) and subsequent water etching. Based on shape memory effect resulting from tiny crystals and the amorphous matrix of PLA, the switch between compact and porous surfaces has been achieved cyclical hot-pressing and recovery in a hot water bath. After hot-pressing, the disappearance of hierarchical pores contributes to compact surface, enabling embedding of the target molecule in PLA nonwoven (, CLOSE state). Upon exposure to heat, PLA nonwoven recovers to its permanent shape and exhibits a porous surface, providing a penetrative diffusion pathway for small molecules (, OPEN state). The hierarchically porous structure and shape memory effect endow PLA nonwoven with the capability of rapid release. Our results provide a good candidate for some potential applications, such as temperature-controlled quick-release of catalysts and drugs.
在这项工作中，通过将聚乳酸（PLA）与聚环氧乙烷（PEO）的混合溶液进行静电纺丝并随后进行水蚀刻，制备了具有分级多孔结构的聚乳酸形状记忆无纺布。基于聚乳酸微小晶体和非晶基体产生的形状记忆效应，通过在热水浴中进行循环热压和恢复，实现了致密表面与多孔表面之间的切换。热压后，分级孔的消失有助于形成致密表面，使得目标分子能够嵌入聚乳酸无纺布中（即“关闭”状态）。受热时，聚乳酸无纺布恢复到其永久形状并呈现多孔表面，为小分子提供渗透扩散途径（即“打开”状态）。分级多孔结构和形状记忆效应赋予了聚乳酸无纺布快速释放的能力。我们的研究结果为一些潜在应用提供了良好的候选材料，例如催化剂和药物的温控快速释放。
