Dorin Rachel Mika, Marques Débora Salomon, Sai Hiroaki, Vainio Ulla, Phillip William A, Peinemann Klaus-Viktor, Nunes Suzana P, Wiesner Ulrich
Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853-1501, United States.
HASYLAB at DESY, Notkestr. 85, 22607 Hamburg, Germany.
ACS Macro Lett. 2012 May 15;1(5):614-617. doi: 10.1021/mz300100b. Epub 2012 Apr 19.
Small-angle X-ray scattering (SAXS) analysis of the diblock copolymer poly(styrene--(4-vinyl)pyridine) in a ternary solvent system of 1,4-dioxane, tetrahydrofuran, and ,-dimethylformamide, and the triblock terpolymer poly(isoprene--styrene--(4-vinyl)pyridine) in a binary solvent system of 1,4-dioxane and tetrahydrofuran, reveals a concentration-dependent onset of ordered structure formation. Asymmetric membranes fabricated from casting solutions with polymer concentrations at or slightly below this ordering concentration possess selective layers with the desired nanostructure. In addition to rapidly screening possible polymer solution concentrations, solution SAXS analysis also predicts hexagonal and square pore lattices of the final membrane surface structure. These results suggest solution SAXS as a powerful tool for screening casting solution concentrations and predicting surface structure in the fabrication of asymmetric ultrafiltration membranes from self-assembled block copolymers.
对二嵌段共聚物聚（苯乙烯-（4-乙烯基）吡啶）在1,4-二氧六环、四氢呋喃和N,N-二甲基甲酰胺的三元溶剂体系中，以及三嵌段三元共聚物聚（异戊二烯-苯乙烯-（4-乙烯基）吡啶）在1,4-二氧六环和四氢呋喃的二元溶剂体系中的小角X射线散射（SAXS）分析表明，有序结构形成的起始点与浓度有关。由聚合物浓度处于或略低于该有序浓度的浇铸溶液制备的不对称膜具有所需纳米结构的选择层。除了快速筛选可能的聚合物溶液浓度外，溶液SAXS分析还能预测最终膜表面结构的六边形和正方形孔晶格。这些结果表明溶液SAXS是一种用于筛选浇铸溶液浓度和预测由自组装嵌段共聚物制备不对称超滤膜时表面结构的有力工具。
