Journal of Central South University

, Volume 18, Issue 2, pp 337–342 | Cite as

Synthesis and characterization of polyfunctional aziridine/polyester microcapsules by multiple emulsion-solvent evaporation method

  • Jian-qing Hu (胡剑青)Email author
  • Hai-jun Zhu (朱海军)
  • Wei-ping Tu (涂伟萍)
  • Feng Wang (王锋)


Polyfunctional aziridine/polyester microcapsules as control-release waterborne cross-linker were synthesized by multiple emulsion-solvent evaporation method. The results show that, a lower surface free energy with shell polyester is more favourable for the formation of microcapsules. Full encapsulating microcapsules are synthesized with the polyester with a surface free energy of 34.5 mJ/m2. Shell-to-core feeding mass ratio has a significant influence on the morphology and core content of the resulting microcapsules. Well defined spherical microcapsules with uniform shell thickness and core content at around 22% are produced at a shell-to-core mass ratio of 1:1. When 2.5% of colloid stabilizer is used, hollow spherical microcapsules are obtained. A high solvent evaporation rate results in wrinkling and porosity of the microcapsules, and an evaporation rate equivalent to solvent elimination in about 2 h provides a uniform rate of surface hardening. The characterization of the microcapsules by SEM and FTIR demonstrates that polyfunctional aziridine is encapsulated at the centre of the microcapsule. The microcapsules synthesized can be broken at a high shear rate.

Key words

microcapsule aziridine polyester multiple emulsion-solvent evaporation 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. [1]
    KONDO A. Microcapsule processing and technology [M]. New York: Marcel Dekker, 1979: 165.Google Scholar
  2. [2]
    SPARKS R E. Microencapsulation [M]. New York: Marcel Dekker, 1989: 255.Google Scholar
  3. [3]
    BENITA S. Microencapsulation: Methods and Industrial applications [M]. New York: Marcel Dekker, 1996: 12.Google Scholar
  4. [4]
    ARSHADY R. Microspheres, microcapsules and liposomes [M]. London: Citrus Books, 1999: 25.Google Scholar
  5. [5]
    AO Z, YANG Z, WANG J F, ZHANG G Z, NGAI T. Emulsiontemplated liquid core-polymer shell microcapsule formation [J]. Langmuir, 2009, 25: 2572–2574.CrossRefGoogle Scholar
  6. [6]
    BLAISZIK B J, CARUSO M M, McILROY D, MOORE J, WHITE S R, SOTTOS N R. Microcapsules filled with reactive solutions for self-healing materials [J]. Polymer, 2009, 50: 990–997.CrossRefGoogle Scholar
  7. [7]
    GHOSH S K. Functional coatings by polymer microencapsulation [M]. Wiley-VCH, 2006: 282.Google Scholar
  8. [8]
    HOGAN J E, AULTON M. Pharmaceutical coating technology [M]. London: Taylor & Francis, 1995: 215.Google Scholar
  9. [9]
    OLIVIER P H, NICOLAS J, LAHOUSSINE O. Real-time monitoring of fragrance release from cotton towels by low thermal mass gas chromatography using a longitudinally modulating cryogenic system for headspace sampling and injection [J]. Anal Chem, 2010, 82(2): 729–737.CrossRefGoogle Scholar
  10. [10]
    HU S H, TSAI C H, LIAO C F, LIU D M, CHEN S Y. Controlled rupture of magnetic polyelectrolyte microcapsules for drug delivery [J]. Langmuir, 2008, 24(20): 11811–11818.CrossRefGoogle Scholar
  11. [11]
    UTTAM M, SATISH P. Dual drug delivery microcapsules via layer-by-layer self-assembly [J]. Langmuir, 2009, 25(18): 10515–10522.CrossRefGoogle Scholar
  12. [12]
    STEVEN A C, STEPHEN L W. Modeling approach to assess clustering impact on release rates of pesticides from microencapsulated products [J]. J Agric Food Chem, 2009, 57(12): 5443–5451.CrossRefGoogle Scholar
  13. [13]
    BROWN E N, KESSLERS M R, SOTTOST N T. In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene [J]. J Microencapsulation, 2003, 20: 719–730.CrossRefGoogle Scholar
  14. [14]
    XU Xiang, DONG Jie, LI Jie. Analysis of volatile components in propolis by solid-phase micro-extraction and GC-MS [J]. Food Industry Technology, 2008, 29(5): 57–60. (in Chinese)Google Scholar
  15. [15]
    XIANG Z Y, LU Y C, ZOU Y, GONG X C, LUO G S. Preparation of microcapsules containing ionic liquids with a new solvent extraction system [J]. Reactive and Functional Polymers, 2008, 68: 1260–1265.CrossRefGoogle Scholar
  16. [16]
    YUAN Li, LIANG Guo-zheng. Synthesis and characterization of microencapsulated dicyclopentadiene with melamine-formaldehyde resins [J]. Coll Poly Sci, 2007, 285: 781–791.CrossRefGoogle Scholar
  17. [17]
    RULE J D, SOTTOS N R, WHITE S R. Effect of microcapsule size on the performance of self-healing polymers [J]. Polymer, 2007, 48: 3520–3529.CrossRefGoogle Scholar
  18. [18]
    YANG H, WU G, CHEN H Z, WANG M. Oil core/polymer shell microcapsules prepared by solvent evaporation technique [J]. Sciencepaper Online, 2009, 4(4): 288–291.Google Scholar
  19. [19]
    LI Ming, ROUAUD O, PONCELET D. Microencapsulation by solvent evaporation state of the art for process engineering approaches [J]. International Journal of Pharmaceutics, 2008, 363(1/2/3): 26–39.CrossRefGoogle Scholar
  20. [20]
    TORZA S, MASON S G. Three-phase interactions in shear and electrical fields [J]. Journal of Colloid and Interface Science, 1970, 33(1): 67–83.CrossRefGoogle Scholar

Copyright information

© Central South University Press and Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Jian-qing Hu (胡剑青)
    • 1
    Email author
  • Hai-jun Zhu (朱海军)
    • 1
  • Wei-ping Tu (涂伟萍)
    • 1
  • Feng Wang (王锋)
    • 1
  1. 1.School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhouChina

Personalised recommendations