期刊
MACROMOLECULAR RAPID COMMUNICATIONS
卷 43, 期 3, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/marc.202100632
关键词
amphiphilic polymers; block copolymers; membranes; self-assembly; UV-cross-linking
资金
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [EXC-2193/1 - 390951807]
- DFG [GA2169/7-1, DFG-PAK 962/1]
- Projekt DEAL
A block copolymer (P(BMA-co-BPMA-co-MMA)-b-P(HEMA)) was prepared via a two-step ATRP method and fabricated into a porous membrane using the SNIPS process. UV-mediated cross-linking was used to stabilize the membrane and increase the water flux. The study showed enhanced swelling resistance and water flux for the cross-linked BCP membranes compared to the noncross-linked ones.
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.
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