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Preparation of thermoresponsive core–shell polymeric microspheres and hollow PNIPAM microgels

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Abstract

A reliable and efficient route for preparing thermoresponsive hollow microgels based on cross-linked poly(N-isopropyl acrylamide) (PNIPAM) was developed. Firstly, monodisperse thermoresponsive core–shell microspheres composed of a P(styrene (St)-co-NIPAM) core and a cross-linked PNIPAM shell were prepared by seeded emulsion polymerization using P(St-co-NIPAM) particles as seeds. The size of the P(St-co-NIPAM) core can be conveniently tuned by different dosages of sodium dodecyl sulfate. The thickness of the cross-linked PNIPAM shell can be controlled by varying the dosage of NIPAM in the preparation of PNIAPM shell. Then, hollow PNIPAM microgels were obtained by simply dissolving the P(St-co-NIPAM) core with tetrahydrofuran. The core–shell microspheres and the hollow microgels were characterized by transmission electron microscopy, dynamic light scattering, atomic force microscopy, and Fourier-transform infrared spectroscopy.

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Acknowledgements

This work was supported by the National Nature Science Foundation of China (Grant no. 20728404 and 20674009), the National Science Fund for Distinguished Young Scholars of China (50525310), the Cultivation Fund of the Key Scientific and Technical Innovation Project, Ministry of Education of China (No. 707023) and Shanghai Leading Academic Discipline Project (B113).

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Authors and Affiliations

  1. Key Laboratory of Molecular Engineering of Polymers, Ministry of Education, Department of Macromolecular Science, Fudan University, Shanghai, 200433, China

    Feng Zhang & Chang-Chun Wang

  2. School of Material Science and Engineering, Yancheng Institute of Technology, Yancheng, 224003, China

    Feng Zhang

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  1. Feng Zhang
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  2. Chang-Chun Wang
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Correspondence to Chang-Chun Wang.

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Zhang, F., Wang, CC. Preparation of thermoresponsive core–shell polymeric microspheres and hollow PNIPAM microgels. Colloid Polym Sci 286, 889–895 (2008). https://doi.org/10.1007/s00396-008-1842-x

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  • DOI: https://doi.org/10.1007/s00396-008-1842-x

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