Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States.
ACS Appl Mater Interfaces. 2013 Jun 12;5(11):5044-50. doi: 10.1021/am400847m. Epub 2013 May 20.
Ultrafiltration membranes with an 80 nm thick block polymer derived selective layer containing 20 nm cylindrical pores were prepared by removing poly(lactide) (PLA) from a poly(styrene)-b-poly(isoprene)-b-poly(lactide) (PS-PI-PLA) film onto a microporous polymer support. The block polymer film adopted a core(PLA)-shell(PI) cylindrical morphology in which vertically-oriented PLA cylinders were degraded to leave PI-lined channels in a PS matrix. Thanks to the combination of PS and PI in the nanoporous matrix, chemical cross-linking was not needed to provide mechanical stability in the thin film. The membranes showed a hydraulic flux of 165 L m(-2) h(-1) bar(-1) and were able to size-discriminate poly(ethylene oxide) (PEO) solutes in agreement with theoretical predictions.
采用聚（苯乙烯）-嵌段-聚（异戊二烯）-嵌段-聚（乳酸）（PS-PI-PLA）薄膜在多孔聚合物支撑体上除去聚乳酸（PLA），制备了具有 80nm 厚的嵌段聚合物衍生的选择层的超滤膜，该选择层含有 20nm 圆柱孔。该嵌段聚合物薄膜采用核（PLA）-壳（PI）圆柱形态，其中垂直取向的 PLA 圆柱被降解，在 PS 基质中留下 PI 衬里的通道。由于纳米多孔基质中 PS 和 PI 的结合，不需要化学交联来提供薄膜的机械稳定性。该膜表现出 165 L m(-2) h(-1) bar(-1) 的水力通量，并能够根据理论预测对聚环氧乙烷（PEO）溶质进行尺寸筛分。
