Preparation of Microcapsules for Self-Healing Polymers

Abstract:

In this paper, melamin-formaldehyde microcapsules filled with pentaerythritol tetrakis (3-mercaptopropionate) (PETMP) or epoxy were prepared via oil-in-water emulsion polymerization method. Two different routes were chosen from literature, and applied with some changes. The effects of modification of reaction conditions on the resulting capsules were studied. It was found that too low pH value in the emulsion causes burst polymerization of the wall material, without microcapsule formation. When pH was set to 4.5 spherical microcapsules were formed. Optical microscopy was used to evaluate the microcapsules.

• Periodical: Materials Science Forum (Volume 729)
• Pages: 205-209
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.729.205
• Online since: November 2012
• Authors: Anna Czeller, Tibor Czigány
• Keywords: Emulsion Polymerization, Microencapsulation, Self-Healing

References

[1] White S.R., Sottos N.R., Geubelle P.H., Moore J.S., Kessler M.R., Sriram S.R., Brown E.N., Viswanathan S.: Autonomic healing of polymer composites, Nature. 409 (2001) 794-797.

DOI: 10.1038/35057232

[2] Murphy E.B., Wudl F.: The world of smart healable materials. Progress in Polymer Science. 35 (2010) 223-251.

DOI: 10.1016/j.progpolymsci.2009.10.006

[3] Blaiszik B.J., Kramer S.L.B., Olugebefola S.C., Moore J.S., Sottos N.R., White S.R.: Self-healing polymers and composites. Annual Review of Materials Research. 40 (2010) 179-211.

DOI: 10.1146/annurev-matsci-070909-104532

[4] Yuan Y.C., Yin T., Rong M.Z., Zhang M.Q.: Self healing in polymers and polymer composites. Concepts, realization and outlook: A review. Express Polymer Letters. 2 (2008) 238-250.

DOI: 10.3144/expresspolymlett.2008.29

[5] Yuan Y.C., Rong M.Z., Zhang M.Q., Chen J., Yang G.C., Li X.M.: Self-healing polymeric materials using epoxy/mercaptan as the healant. Macromolecules. 41 (2008) 5197-5202.

DOI: 10.1021/ma800028d

[6] Yuan L., Liang G. -Z., Lie J. -Q.: Synthesis and characterization of microencapsulated dicyclopentadiene with melamine–formaldehyde resins. Colloid Polymer Science. 285 (2007) 781-791.

DOI: 10.1007/s00396-006-1621-5

[7] Brown E.N., Kessler M.R., Sottos N.R., White S.R.: In situ poly(urea-formaldehyde) microencapsulation of dicyclopentadiene. Journal of Microencapsulation. 20 (2003) 719-730.

DOI: 10.1080/0265204031000154160

[8] Yin T., Rong M.Z., Zhang M.Q., Yang G.C.: Self-healing epoxy composites – Preparation and effect of the healant consisting of microencapsulated epoxy and latent curing agent. Composites Science and Technology. 67 (2007) 201-212.

DOI: 10.1016/j.compscitech.2006.07.028

[9] Yuan Y.C., Rong M.Z., Zhang M.Q.: Preparation and characterization of microencapsulated polythiol. Polymer. 49 (2008) 2531-2541.

DOI: 10.1016/j.polymer.2008.03.044

[10] Blaiszik B.J., Caruso M.M., McIlroy D.A., Moore J.S., White S.R., Sottos N.R.: Microcapsules filled with reactive solutions for self-healing materials. Polymer. 50 (2009) 990-997.

DOI: 10.1016/j.polymer.2008.12.040

[11] Frere W., Danicher L., Gramain P.: Preparation of polyurethane microcapsules by interfacial polycondensation. European Polymer Journal. 34 (1998) 193-199.

[12] Yuan L., Liang G., Xie J., Li L., Guo J.: Preparation and characterization of poly(urea-formaldehyde) microcapsules filled with epoxy resins. Polymer. 47 (2006) 5338-5349.

DOI: 10.1016/j.polymer.2006.05.051

[13] Szabó T., Molnár-Nagy L., Bognár J., Nyikos L., Telegdi J.: Self-healing microcapsules and slow release microspheres in paints. Progress in Organic Coatings. 72 (2011) 52-57.

DOI: 10.1016/j.porgcoat.2011.03.014