Key Laboratory of Green Processing and Functional New Textile Materials of Ministry of Education, Wuhan Textile University, Wuhan 430200, PR China.
College of Material Science and Engineering, Wuhan Textile University, Wuhan 430200, PR China.
Int J Biol Macromol. 2019 Jul 15;133:902-910. doi: 10.1016/j.ijbiomac.2019.04.145. Epub 2019 Apr 23.
Temperature is a critical parameter that can control the morphology of poly (lactic acid) (PLA) porous membranes prepared through phase inversion induced by water droplets. It determines the volatilization rate of the solvent and the exchange rate between the solvent and nonsolvent. In this work, in order to investigate the effect of temperature on the morphology, PLA porous membranes were prepared via phase inversion induced by water droplets at different temperatures. The morphologies of the prepared membranes were observed using scanning electron microscopy, and the volatilization rate of the solvent and the exchange rate between the solvent and nonsolvent were tested separately. The experimental data indicated that the volatilization rate of the solvent was faster than the exchange rate between the solvent and nonsolvent. A uniform porous structure was obtained for the PLA membrane, and the pore size decreased with the increase in temperature from 25 °C to 75 °C. This result indicated that a PLA porous membrane with desired pore size could be achieved by adjusting the ambient temperature.
温度是一个关键参数，它可以控制通过液滴诱导的相转化制备的聚乳酸（PLA）多孔膜的形态。它决定了溶剂的挥发速率以及溶剂和非溶剂之间的交换速率。在这项工作中，为了研究温度对形态的影响，我们在不同温度下通过液滴诱导的相转化制备了 PLA 多孔膜。使用扫描电子显微镜观察了所制备的膜的形态，并分别测试了溶剂的挥发速率和溶剂与非溶剂之间的交换速率。实验数据表明，溶剂的挥发速率快于溶剂与非溶剂之间的交换速率。对于 PLA 膜，获得了均匀的多孔结构，并且随着温度从 25°C 增加到 75°C，孔径减小。这一结果表明，通过调节环境温度可以获得具有所需孔径的 PLA 多孔膜。
