Morphological transformations of nonequilibrium assemblies of amphiphilic diblock copolymer |
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Authors: | Yang Cong Qi Zhou Bin Chen Jianghua Fang Jun Fu |
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Institution: | 1. School of Chemical Engineering, Ningbo University of Technology, 89 Cuibai Road, Haishu District, Ningbo, Zhejiang Province, 315016, China 2. Polymer and Composites Division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, 519 Zhuangshi Road, Zhenhai District, Ningbo, Zhejiang Province, 315201, China
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Abstract: | Amphiphilic diblock copolymer polystyrene-block-poly(ethylene oxide) (PS-PEO) assembled into nonequilibrium bicontinuous structures or mixture of vesicles, bilayers and nanorods upon rapid micellization induced by rapid addition of selective solvent (water) into the PS-PEO solutions in a common solvent (dimethyl formamide) with different concentrations. These kinetically trapped assemblies were unstable and slowly evolved into thermodynamically favorable spheres and vesicles. The addition of non-ionic surfactant Pluronic P123 upon rapid micellization generated novel nanocages and flower-like vesicles. The nanocages spontaneously transformed into tubules capped with vesicles. These novel assemblies are beyond the classic phase diagram of block copolymer self-assemblies, especially for those primarily based on thermodynamics. |
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