2008
DOI: 10.1021/ma801718v
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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 rel… Show more

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Cited by 440 publications
(349 citation statements)
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“…[35], the maximum strength of this etched HGBs is much higher. And it is twice of the maximum strength of the PU microcapsules (~ 6 MPa) with the similar diameter (~ 70 µm) by Yang et al [36]. These two comparisons verify the robustness of the HGBs after the etching process, although etching through-holes, which can be considered as defects to concentrate the stress, can decrease the strength of the HGBs.…”
Section: Characterization Methodssupporting
confidence: 57%
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“…[35], the maximum strength of this etched HGBs is much higher. And it is twice of the maximum strength of the PU microcapsules (~ 6 MPa) with the similar diameter (~ 70 µm) by Yang et al [36]. These two comparisons verify the robustness of the HGBs after the etching process, although etching through-holes, which can be considered as defects to concentrate the stress, can decrease the strength of the HGBs.…”
Section: Characterization Methodssupporting
confidence: 57%
“…The cleanness of the HGBs assures that they can carry as much healing agent as possible for selfhealing purpose. maximum displacement relative to the diameter is 8.13 ± 1.11%, which is much lower than that the PUF microcapsule(~ 35% for 63 µm) [35] or the PU microcapsule (~ 11% for 67 µm) [36], and is attributed to the brittle feature of glass. [35], the maximum strength of this etched HGBs is much higher.…”
Section: Characterization Methodsmentioning
confidence: 72%
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“…[6][7][8] For polymers [9][10][11] and polymer coatings [12][13][14][15] several approaches have been reported to restore the integrity of the material, either by refilling the damaged areas, e.g., a) Electronic addresses: a.c.c.esteves@tue.nl and g.dewith@tue.nl via encapsulated reactive components (autonomous healing) or by reestablishing chemical bonds through reversible reactions triggered by external stimuli such as temperature, light or a pH switch (triggered healing). These approaches can use intrinsic healing concepts, [16][17][18][19] in which the healing agent is inherent to the material (i.e., is a part of the network or formulation) or extrinsic healing, where external components are added, such as filled capsules [20][21][22][23] or microvascular networks. 24,25 The intrinsic healing concept may allow multiple healing events but requires a certain mobility of the system (or at least part of it).…”
Section: Introductionmentioning
confidence: 99%
“…A significant advantage of this approach is the continuing maturation of technology for micro-encapsulation of a wide range of chemicals for self-healing (see, e.g. Yang et al 2008). Perhaps the most severe limitation is the difficulty in meeting the repeatability criterion since once emptied, the capsules are not likely to be usable for repair during the next cycle of damage.…”
Section: Further Discussion and Conclusionmentioning
confidence: 99%