3D打印聚乳酸膜及其油-水分离性能

3D Printing of Polylactic Acid Membranes for Oil-Water Separation and Its Performance

采用3D(3-Dimension)打印技术制备了具有规则孔道结构且孔径可控的多孔聚乳酸(PLA)膜,然后以聚乙烯醇(PVA)为表面改性剂,利用氢键交联作用制备了PVA/PLA复合膜。当PLA膜基底填充率为70%时制备的PVA/PLA-70%复合膜的水下油接触角为165.9°,具有超疏油特性。在使用微量水润湿油-水分离膜条件下,PVA/PLA-70%复合膜的油-水分离实验结果表明:PVA/PLA-70%复合膜的油-水分离效率大于99%、水通量高达73.12 L/(m^(2)·s);油-水分离循环使用80次后,分离效率仍大于97%,且水通量稳定在56.10 L/(m^(2)·s),PVA改性PLA膜具有良好的循环稳定性。利用3D打印技术为制备可生物降解的油-水分离膜提供了新的研究方法。

Three-dimensional(3D)printing technique was used to fabricate porous polylactic acid(PLA)membranes with a controllable pore size and regular pore structure.Then PVA/PLA composite membrane was prepared using polyvinyl alcohol(PVA)as the surface modifier through hydrogen bonds cross-linking.When the filling rate of PLA membrane reaches 70%,the underwater oil contact angle of the PVA/PLA-70%composite membrane is 165.9°,showing superoleophobic properties.In case of applying a tiny amount of water to moisten the oil-water separation membrane,the PVA/PLA-70%composite membrane oil-water separation experiment demonstrates that:(1)The separation efficiency of PVA/PLA-70%is greater than 99%and the water flux is 73.12 L/(m^(2)·s);(2)After 80 oil-water separation cycles,the separation efficiency is still greater than 97%,and the water flux keeps constant at 56.10 L/(m^(2)·s),confirming that PVA modified PLA membrane has a reliable cycle stability.In conclusion,the 3D printing technique provides a novel research methodology for preparing biodegradable oil-water separation membrane.