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Microencapsulation of Isocyanates for Self-Healing Polymers
Abstract
Microcapsules containing reactive diisocyanate for use in self-healing polymers are successfully fabricated via interfacial polymerization of polyurethane (PU). Isocyanates are potential catalyst-free healing agents for use in humid or wet environments. The preparation of PU prepolymer and microencapsulation of isophorone diisocyanate (IPDI) healing agent are presented. Smooth spherical microcapsules of 40−400 μm in diameter are produced by controlling agitation rate (500−1500 rpm) according to a power law relation ( n = −2.24). The PU shell wall thickness varies linearly with capsule diameter, such that the capsules wall thickness to diameter ratio is constant (∼0.05). High yields (∼70%) of a free-flowing powder of IPDI/PU capsules are produced with a liquid core content of 70 wt % as determined by TGA analysis. The microcapsules are stable with only ∼10 wt % loss of IPDI detected after 6 months storage under ambient conditions. Direct mechanical compression testing of microcapsules reveals a brittle fracture mode and normalized shell wall strength that varies with capsule diameter in a power law fashion ( n = −0.77).
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Cited by
Mechanically-Induced Chemical Changes in Polymeric Materials
Caruso, M. M., Davis, D. A., Shen, Q., Odom, S. A., Sottos, N. R., White, S. R., & Moore, J. S. (2009) · Chemical Reviews · doi:10.1021/cr9001353 · Cited by 1,372
Self-citationZhu, D. Y., Rong, M. Z., & Zhang, M. Q. (2015) · Progress in Polymer Science · doi:10.1016/j.progpolymsci.2015.07.002 · Cited by 631
Nanoencapsulation of phase change materials for advanced thermal energy storage systems
Shchukina, E. M., Graham, M., Zheng, Z., & Shchukin, D. G. (2018) · Chemical Society Reviews · doi:10.1039/c8cs00099a · Cited by 579
Interfacial Polymerization: From Chemistry to Functional Materials
Zhang, F., Fan, J., & Wang, S. (2020) · Angewandte Chemie International Edition · doi:10.1002/anie.201916473 · Cited by 478
Diesendruck, C. E., Sottos, N. R., Moore, J. S., & White, S. R. (2015) · Angewandte Chemie International Edition · doi:10.1002/anie.201500484 · Cited by 455
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Metadata
- Authors
- Yang, J., Keller, M. W., Moore, J. S., White, S. R., & Sottos, N. R.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-11-25
- Volume
- 41
- Issue
- 24
- Pages
- 9650-9655
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2157346754
- Cited by
- 479
- References
- 0
- FWCI
- 8.91
- Type
- journal article
- Language
- en
- Open access
- closed
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- Yang, J., Keller, M. W., Moore, J. S., White, S. R., & Sottos, N. R. (2008). Microencapsulation of Isocyanates for Self-Healing Polymers. Macromolecules. https://doi.org/10.1021/ma801718v
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