Nanoporous Block Copolymer Membranes with Enhanced Solvent Resistance via UV-Mediated Cross-Linking Strategies.
Nanoporous Block Copolymer Membranes with Enhanced Solvent Resistance via UV-Mediated Cross-Linking Strategies.
复制标题
通过紫外线介导的交联策略增强耐溶剂性的纳米多孔嵌段共聚物膜
DOI：
10.1002/marc.202100632
复制
发表时间：
2022
影响因子：
4.6
通讯作者：
M. Gallei
中科院分区：
文献类型：
--
作者：
F. V. Frieß;J. Mayer;L. Gemmer;V. Presser;B. N. Balzer;M. Gallei
本工作采用两步原子转移自由基聚合(ATRP)方法合成了由聚(甲基丙烯酸丁酯-甲基丙烯酸二苯甲酮-甲基丙烯酸甲酯)-嵌段-(甲基丙烯酸羟乙酯)(P(BMA-co-BPMA-co-MMA)-b-P(HEMA))组成的嵌段共聚物。从四氢呋喃(THF)、1，4-二氧六环和二甲基甲酰胺(DMF)的三元混合溶剂中，采用自组装和非溶剂诱导相分离(SNIPS)工艺制备了BCP膜。通过扫描电子显微镜(SEM)证实了整体不对称膜的顶层多孔层的存在，膜的孔径约为30 nm。调整用于纳米孔膜的紫外光介导型交联剂以保持开放的和等孔质的顶层。用原子力显微镜研究了未交联型和交联型BCP膜在水、水/乙醇(1：1)和纯乙醇中的溶胀性能，证明了紫外光交联对膜孔结构的稳定作用。最后，探讨了本文所述的交联剂对所得膜的水通量测量的影响。结果发现，所有被测试的溶剂的抗溶胀性都有所提高，导致与原始膜相比，水通量增加。本文所建立的紫外光介导型交联剂有望为分离技术领域的新一代多孔膜和稳定膜铺平道路。
In this work, a block copolymer (BCP) consisting of poly((butyl methacrylate‐co‐benzophenone methacrylate‐co‐methyl methacrylate)‐block‐(2‐hydroxyethyl methacrylate)) (P(BMA‐co‐BPMA‐co‐MMA)‐b‐P(HEMA)) is prepared by a two‐step atom‐transfer radical polymerization (ATRP) procedure. BCP membranes are fabricated applying the self‐assembly and nonsolvent induced phase separation (SNIPS) process from a ternary solvent mixture of tetrahydrofuran (THF), 1,4‐dioxane, and dimethylformamide (DMF). The presence of a porous top layer of the integral asymmetric membrane featuring pores of about 30 nm is confirmed via scanning electron microscopy (SEM). UV‐mediated cross‐linking protocols for the nanoporous membrane are adjusted to maintain the open and isoporous top layer. The swelling capability of the noncross‐linked and cross‐linked BCP membranes is investigated in water, water/ethanol mixture (1:1), and pure ethanol using atomic force microscopy, proving a stabilizing effect of the UV cross‐linking on the porous structures. Finally, the influence of the herein described cross‐linking protocols on water‐flux measurements for the obtained membranes is explored. As a result, an increased swelling resistance for all tested solvents is found, leading to an increased water flux compared to the pristine membrane. The herein established UV‐mediated cross‐linking protocol is expected to pave the way to a new generation of porous and stabilized membranes within the fields of separation technologies.