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pH/temperature dual stimuli-responsive microcapsules with interpenetrating polymer network structure

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Abstract

The microcapsules with interpenetrating polymer network (IPN) structure based on crosslinked poly (N-isopropylacrylamide) (PNIPAM) and crosslinked poly (acrylic acid) (PAA) were fabricated in a three-step process. Firstly, silica/PNIPAM core/shell composite particles were synthesized by thermo-initiated seed precipitation polymerization using 3-(trimethoxysilyl)propyl methacrylate modified silica colloidal particles as seeds and N-isopropylacrylamide and N,N′-methylenebisacrylamide (MBA) as monomer and crosslinker, respectively. Secondly, PAA network was incorporated into the shell of the composite particles by redox-initiated polymerization of acrylic acid and MBA entrapped in the PNIPAM network. Finally, the silica core of the composite particles was removed using hydrofluoric acid under certain condition to produce the microcapsules. The chemical compositions, their mass ratio, and particle sizes of the particles formed in each step were determined by Fourier transformation infrared spectroscopy, thermogravimetry, and dynamic laser light scattering (DLLS), respectively. The IPN structure of the microcapsules was identified by transmission electron microscopy (TEM) using uranyl acetate staining method, and their hollow structure was evidenced by TEM and scanning electron microscopy. Their temperature- or pH-dependent hydrodynamic diameters were measured by DLLS, and the results showed that the microcapules had both pH- and temperature-responsive properties, and the temperature-responsive component and the pH-responsive component inside the microcapsule shell had little interference with each other.

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Acknowledgment

This work was supported by the scientific research innovation project of Shanghai Education Committee (Grant No.09ZZ67) and the Shanghai Postdoctoral Sustentation Fund (Grant No.10R21410200).

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Authors and Affiliations

  1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, Donghua University, Shanghai, 201620, China

    Zhimin **ng, Congling Wang & Liusheng Zha

  2. Research Center for Analysis and Measurement, Donghua University, Shanghai, 201620, China

    Jie Yan, Li Zhang, Lan Li & Liusheng Zha

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  1. Zhimin **ng
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  2. Congling Wang
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  3. Jie Yan
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  4. Li Zhang
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  5. Lan Li
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  6. Liusheng Zha
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Correspondence to Liusheng Zha.

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**ng, Z., Wang, C., Yan, J. et al. pH/temperature dual stimuli-responsive microcapsules with interpenetrating polymer network structure. Colloid Polym Sci 288, 1723–1729 (2010). https://doi.org/10.1007/s00396-010-2316-5

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  • DOI: https://doi.org/10.1007/s00396-010-2316-5

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