Abstract
Two different diene monomers [dicyclopentadiene (DCPD) and 5-ethylidene-2-norbornene (ENB)] as self-healing agents for polymeric composites were microencapsuled byin situ polymerization of urea and formaldehyde. We obtained plots of the storage modulus (G′) and tan δ as a function of cure time by using dynamic mechanical analysis to investigate the cure behavior of the unreacted self-healing agent mixture in the presence of a catalyst. Glass transition temperatures (T g ) and exothermic reactions of samples cured for 5 and 120 min in the presence of different amounts of the catalyst were analyzed by differential scanning calorimetry. Of the two dienes, ENB may have advantages as a self-healing agent because, when cured under same conditions as DCPD, it reacts much faster in the presence of a much lower amount of catalyst, has no melting point, and produces a resin that has a higher value ofT g . Microcapsules containing the healing agent were successfully formed from both of the diene monomers and were characterized by thermogravimetric analysis. Optical microscopy and a particle size analyzer were employed to observe the morphology and size distribution, respectively, of the microcapsules. The microcapsules exhibited similar thermal properties as well as particle shapes and sizes.
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S. R. White, N. R. Sottos, P. H. Geubelle, J. S. Moore, M. R. Kessler, S. R. Sriram, E. N. Brown, and S. Viswanathan,Nature,409, 794 (2001).
M. R. Kessler and S. R. White,Composites, Part A,32, 683 (2001).
M. R. Kesseler,Characterization and Performance of a Self-Healing Composite Material, PhD Dissertation, University of Illinois at Urbana-Champaign, 2002.
M. R. Kessler, N. R. Sottos, and S. R. White,Composites, Part A,34, 743 (2003).
M. Feve,Makromol. Chem., Macromol. Symp.,30, 95 (1989).
R. B. Prime, J. M. Burns, M. L. Karmin, C. H. Moy, and H.-B. Tu,J. Coat. Tech.,60, 55 (1988).
R. H. Grubbs and M. Sanford, inRing Opening Metathesis Polymerization and Related Chemistry, E. Khosravi and T. Szymanska-Buzar, Eds., Kluwer Academic Publishers, Dordrecht, 2002, Part I.
Y. S. Yang, E. Lafontaine, and B. Mortaigne,Polymer,38, 1121 (1997).
J. C. Mol,J. Mol. Cat.,213, 39 (2004).
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Lee, J.K., Hong, S.J., Liu, X. et al. Characterization of dicyclopentadiene and 5-ethylidene-2-norbornene as self-healing agents for polymer composite and its microcapsules. Macromol. Res. 12, 478–483 (2004). https://doi.org/10.1007/BF03218430
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DOI: https://doi.org/10.1007/BF03218430