Abstract
In this work, we reported a new method for the convenient fabrication of various functional porous films, which cannot be directly generated using breath figures (BFs). A series of polystyrene-b-poly (ionic liquid) (PS-b-PIL) block copolymers were employed for BFs process for the first time. It was found that PS-b-PIL could form well-defined BFs porous structure. Remarkably, the described PS-b-PIL copolymers are prone to form hierarchical structure, and the formed pore structure is strongly dependent on the used experimental parameters. Importantly, we found that the anion exchange could provide as an effective means, by which the porous films could be further and facilely converted into other functional films. As a demonstration, in our case, porous films with different surface (hydrophilic and hydrophobic) property, porous polydopamine films decorated with Au nanoparticles or glutathione and porous SiO2 films were prepared by using different counteranions as well as further conversion. Due to the unlimited combination of cation and anion in ionic liquid moiety, all the results indicate that the BFs films generated by using PS-PIL could serve as a platform to access various functional porous films by a simple counteranion exchange, showing a great extendable capability.
Highlights
All the results described here indicate that owing to the unlimited combination of cation and anion in ionic liquid moiety, the breath figures (BFs) films generated by using PS-b-polymerized ionic liquids (PILs) could serve as a versatile platform to access various functional porous films by a simple counteranion exchange, showing great extendable capability
We synthesized a variety of polymerized ionic liquid block copolymers by completely ionization of polystyrene-b-poly (PS-b-PCMS) diblock copolymers synthesized by RAFT according to previously reported procedures[20,21,22,23,24]
A series of polystyrene-b-poly (PS-b-PIL) block copolymers were synthesized by us, and their formation behaviour of honeycomb films by BFs approach under different conditions were systematically studied for the first time
Summary
In this work, based on a simple counteranion exchange reaction of ionic liquid moiety we developed a new approach for convenient fabrication of various functional porous films, which cannot be directly generated using BFs process. Owing to their unique physical and chemical properties, polymerized ionic liquids (PILs) are emerging as a new type of materials showing great potential applications[16,17,18]. All the results described here indicate that owing to the unlimited combination of cation and anion in ionic liquid moiety, the BFs films generated by using PS-b-PIL could serve as a versatile platform to access various functional porous films by a simple counteranion exchange, showing great extendable capability. The proposed method here is very attractive for the preparation of functional and scalable films by the use of polystyrene-b-poly (ionic liquid) block copolymers and the combination of BFs and ion exchange
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