Prior studies on photonic pigments of amphiphilic bottlebrush block copolymers (BBCPs) through an organized spontaneous emulsification (OSE) mechanism have been limited to using polyethylene glycol (PEG) as the hydrophilic side chains and toluene as the organic phase. Herein, a family of polystyrene-block-polyvinylpyrrolidone (PS-b-PVP) BBCPs are synthesized with PVP as the hydrophilic block. Biocompatible and sustainable anisole is employed for dissolving the obtained BBCPs followed by emulsification of the solutions in water. Subsequent evaporation of oil-in-water emulsion droplets triggers the OSE mechanism, producing thermodynamically stable water-in-oil-in-water (w/o/w) multiple emulsions with uniform and closely packed internal droplet arrays through the assembly of the BBCPs at the w/o interface. Upon solidification, the homogeneous porous structures are formed within the photonic microparticles that exhibit visible structural colors. The pore diameter is widely tunable (150∼314 nm) by changing the degree of polymerization of BBCP (69∼110), resulting in tunable colors across the whole visible spectrum. This work demonstrates useful knowledge that OSE can be generally used in the fabrication of ordered porous materials with tunable internal functional groups, not only for photonic applications, but also offers a potential platform for catalysis, sensing, separation, encapsulation, etc.

中文翻译：

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通过可持续组织自发乳化制备聚苯乙烯-嵌段-聚乙烯吡咯烷酮瓶刷嵌段共聚物的光子颜料


先前通过有组织的自发乳化（OSE）机制对两亲性洗瓶刷嵌段共聚物（BBCP）光子颜料的研究仅限于使用聚乙二醇（PEG）作为亲水侧链和甲苯作为有机相。在此，以 PVP 作为亲水嵌段合成了一系列聚苯乙烯-嵌段-聚乙烯吡咯烷酮 (PS-b-PVP) BBCP。采用生物相容性和可持续的苯甲醚溶解获得的 BBCP，然后将溶液乳化在水中。随后水包油乳液液滴的蒸发触发 OSE 机制，通过 BBCP 的组装产生热力学稳定的水包油包水 (w/o/w) 多重乳液，具有均匀且紧密堆积的内部液滴阵列在 w/o 接口处。凝固后，在光子微粒内形成均匀的多孔结构，表现出可见的结构颜色。通过改变 BBCP 的聚合度 (69∼110)，孔径可广泛调节 (150∼314 nm)，从而在整个可见光谱范围内实现可调颜色。这项工作展示了有用的知识，即 OSE 通常可用于制造具有可调内部官能团的有序多孔材料，不仅适用于光子应用，而且还为催化、传感、分离、封装等提供了潜在的平台。