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Homoporous Membranes with Tailored Pores by Soaking Block Copolymer/Homopolymer Blends in Selective Solvents: Dissolution versus Swelling
Macromolecules ( IF 5.1 ) Pub Date : 2015-12-15 00:00:00 , DOI: 10.1021/acs.macromol.5b02133
Mingjie Wei 1 , Wei Sun 1 , Xiansong Shi 1 , Zhaogen Wang 1 , Yong Wang 1
Macromolecules ( IF 5.1 ) Pub Date : 2015-12-15 00:00:00 , DOI: 10.1021/acs.macromol.5b02133
Mingjie Wei 1 , Wei Sun 1 , Xiansong Shi 1 , Zhaogen Wang 1 , Yong Wang 1
Affiliation
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Extraction homopolymers premixed in aligned films of block copolymers by rinsing with selective solvents has long been used for the preparation of membranes with uniform straight pores (homoporous membranes). It is frequently assumed that only the dissolution of homopolymers contributes to the pore formation. However, in this work, we demonstrate that the effect of swelling plays a significant role in determining the pore sizes. We prepare blended films of block copolymers of polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) and P2VP homopolymers with low molecular weight and anneal the films to perpendicularly align the P2VP microdomains. Rinsing the aligned films in ethanol results in homoporous membranes, and the pore sizes can be tuned by the dosages of P2VP homopolymers. Interestingly, the pore sizes can also be effectively tailored by changing the rinsing temperatures and/or durations because of the significant contribution of the selective swelling of P2VP blocks under strong rinsing conditions in addition to the contribution of the dissolution of P2VP homopolymers. We identify the portion of the contribution from dissolution and from swelling and demonstrate that the pore sizes can be flexibly tuned within a wider range at no expense of pore ordering and uniformity by balancing the effect of dissolution and swelling.
中文翻译：
通过将嵌段共聚物/均聚物共混物浸泡在选择性溶剂中，将具有定制孔的均质膜：溶解与溶胀
长期以来，通过用选择性溶剂冲洗将提取的均聚物预混在嵌段共聚物的取向膜中一直用于制备具有均匀直孔的膜（均质膜）。通常认为仅均聚物的溶解有助于孔的形成。但是，在这项工作中，我们证明了溶胀的影响在确定孔径方面起着重要作用。我们准备了聚苯乙烯-嵌段-聚（2-乙烯基吡啶）（PS- b）嵌段共聚物的共混膜-P2VP）和低分子量的P2VP均聚物，并退火薄膜以垂直排列P2VP微区。在乙醇中漂洗取向膜会形成均孔膜，并且可以通过P2VP均聚物的剂量来调节孔径。有趣的是，由于P2VP嵌段在强冲洗条件下的选择性溶胀，除了溶解P2VP均聚物的贡献外，还可以通过改变漂洗温度和/或时间来有效地调整孔径。我们确定了溶出和溶胀的部分贡献，并证明可以通过平衡溶出和溶胀的作用，在不影响孔隙有序性和均匀性的情况下，在更大的范围内灵活调整孔径。
更新日期：2015-12-15
中文翻译：
通过将嵌段共聚物/均聚物共混物浸泡在选择性溶剂中，将具有定制孔的均质膜：溶解与溶胀
长期以来，通过用选择性溶剂冲洗将提取的均聚物预混在嵌段共聚物的取向膜中一直用于制备具有均匀直孔的膜（均质膜）。通常认为仅均聚物的溶解有助于孔的形成。但是，在这项工作中，我们证明了溶胀的影响在确定孔径方面起着重要作用。我们准备了聚苯乙烯-嵌段-聚（2-乙烯基吡啶）（PS- b）嵌段共聚物的共混膜-P2VP）和低分子量的P2VP均聚物，并退火薄膜以垂直排列P2VP微区。在乙醇中漂洗取向膜会形成均孔膜，并且可以通过P2VP均聚物的剂量来调节孔径。有趣的是，由于P2VP嵌段在强冲洗条件下的选择性溶胀，除了溶解P2VP均聚物的贡献外，还可以通过改变漂洗温度和/或时间来有效地调整孔径。我们确定了溶出和溶胀的部分贡献，并证明可以通过平衡溶出和溶胀的作用，在不影响孔隙有序性和均匀性的情况下，在更大的范围内灵活调整孔径。
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