Nanoporous Films with Sub-10 nm in Pore Size from Acid-Cleavable Block Copolymers

作者：Li, Yayuan; Xu, Yawei; Cao, Shubo; Zhao, Yongbin; Qu, Ting; Iyoda, Tomokazu; Chen, Aihua^*

来源：Macromolecular Rapid Communications, 2017, 38(5): 1600662.

DOI：10.1002/marc.201600662

• block copolymer
• nanoporous film
• self-assembly
• sub-10 nm

Nanoporous thin films with pore size of sub-10 nm are fabricated using an acid-cleavable block copolymer (BCP), a benzoic imine junction between poly(ethylene oxide) (PEO) and poly(methacrylate) (PMAAz) bearing an azobenzene side chain (denoted as PEO-bei-PMAAz) as the precursor. After a thermal annealing, the block copolymers are self-assembled to form highly ordered PEO cylinders within a PMAAz matrix normal to the film, even in the case of low BCP molecular weight due to the existing of the liquid crystalline (LC) azobenzene rigid segment. Thus, PMAAz thin films with pore size of approximate to 7 nm and density of approximate to 10(12) cm(-2) are obtained after removal of the PEO minor phase by breaking the benzoic imine junction under mild acidic conditions. This work enriches the nanoporous polymer films from BCP precursors and introduces the LC property as a functionality which can further enhance the mechanical properties of the films and broaden their applications.

• 出版日期2017-3
• 单位北京航空航天大学