Helmholtz-Zentrum Geesthacht, Institute of Polymer Research , Max-Planck-Strasse 1, 21502 Geesthacht, Germany.
Institute of Physical Chemistry, University of Hamburg , Martin-Luther-King-Platz 6, 20146 Hamburg, Germany.
ACS Appl Mater Interfaces. 2017 Sep 20;9(37):31224-31234. doi: 10.1021/acsami.6b15199. Epub 2017 Feb 15.
Nanoporous membranes with tailored size pores and multifunctionality derived from self-assembled block copolymers attract growing interest in ultrafiltration. The influence of the structure of block copolymer in the membrane casting solution on the formation of integral asymmetric isoporous block copolymer membranes using the nonsolvent induced phase separation process (NIPS) has been one of the long-standing questions in this research area. In this work we studied the principal role of the solvent on the micellization and self-assembly of asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) diblock copolymers by using a combination of dynamic light scattering (DLS) and small-angle X-ray scattering (SAXS). Our results indicate a significant effect of the solvent selectivity on the optimal casting concentration and solution structure. In addition, morphological characterization of the resulting membranes demonstrates considerable influence of the solvent system on the ordering and uniformity of the pores and pore characteristics in the separation layer as well as porous substructure of the final membranes.
具有定制尺寸孔和多功能性的纳米多孔膜源于自组装嵌段共聚物，在超滤中引起了越来越多的兴趣。在非溶剂致相分离过程（NIPS）中，膜铸液中嵌段共聚物结构对整体非对称等孔嵌段共聚物膜形成的影响一直是该研究领域的长期问题之一。在这项工作中，我们通过使用动态光散射（DLS）和小角 X 射线散射（SAXS）相结合的方法，研究了溶剂对不对称聚苯乙烯嵌段聚（4-乙烯基吡啶）（PS-b-P4VP）嵌段共聚物的胶束化和自组装的主要作用。我们的结果表明，溶剂选择性对最佳铸造浓度和溶液结构有显著影响。此外，对所得膜的形态特征进行了研究，结果表明溶剂体系对分离层中孔的有序性和均匀性以及孔特征和最终膜的多孔子结构有很大的影响。
