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Influence of Mixed Common solvent on the Co-assembled Morphology of PS-b-PEO and CdS Quantum Dots

Chinese Journal of Polymer Science 2016年第9期34卷 1079-1090页

作者： Wei Liu 张海山姬相玲 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China University of Chinese Academy of Sciences Beijing 100049China Department of Colorectal and Anal Surgery China-Japan Union Hospital Jilin UniversityChangchun 130033China

The hybrid structures of polystyrene-b-poly（ethylene oxide）（PS-b-PEO） block copolymer and inorganic nanoparticles with good stability and biocompatibility have potential applications in drug delivery and bioimaging. Spherical co-assemblies of PS120-b-PEO318 and oleylamine-capped CdS quantum dots （QDs） are produced successfully in this work by adding water to a mixed common solvent, such as N,N-dimethylmethanamide （DMF）/chloroform, DMF/tetrahydrofuran （THF）, or DMF/toluene. The energy dispersive X-ray （EDX） spectrum indicates that QDs are located at the interface between the core and shell of the spherical co-assemblies. The co-assembly process during water addition is traced by transmission electron microscopy （TEM） and turbidity measurement. Spherical co-assemblies are formed through budding from bilayers of the block copolymer and QDs. The morphology of the co-assemblies is related to the miscibility of the QD-dispersing solvents with water and the morphology changes from a spherical to a vesicle-like structure with DMF/toluene. Increasing THF content in the mixed solvent causes morphological transitions from spherical co-assemblies to multi-branched cylinders and micelles where QDs are located in the central core. Increasing chloroform content yields vesicle-like structures with protruding rods on the surface. The mechanism of the morphological transitions is also discussed in detail.

关键词： Co-assembly Mixed common solvent PS-b-PEO solvent composition.

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