Rapid Self-Assembly of Block Copolymers for Flower-Like Particles with High Throughput

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• 作者：Zhen Wang ; Yuanyuan Cao ; Xinyue Zhang ; Dingguan Wang ; Ming Liu ; Zhigang XieYapei Wang
• 刊名：Langmuir
• 出版年：2016
• 出版时间：December 20, 2016
• 年：2016
• 卷：32
• 期：50
• 页码：13517-13524
• 全文大小：618K
• ISSN：1520-5827

文摘

The self-assembly of block copolymers has evolved into a foremost bottom-up approach for building polymeric materials. Historical challenges exist within this lively field, including the scalability and elegant simplicity of self-assembled aggregates with predictable structures. Here, we report a generally applicable strategy for the rapid self-assembly of poly(ethylene glycol)-block-poly(l-lactic acid) with the help of a single oil-in-water emulsion. A kind of flower-like polymer particle with filamentous surface branches is rapidly formed after removing the oil phase from the emulsion system. Moreover, the dimension of the branched filaments and the spherical internal core can be controlled through regulating the block ratio and the emulsification conditions. In particular, we propose an explosion theory as a balance between phase separation and interchain interaction for explaining the formation of the branched structures of the flower-like particles. The particles with high throughput are further functionalized with polypyrrole for their use in enhanced photoelectric-sensing applications.