Crack‐healing behavior of epoxy–amine thermosets

Rahmathullah, M. Aflal M.; Palmese, Giuseppe R.

doi:10.1002/app.30152

Cited by 60 publications

(34 citation statements)

References 37 publications

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“…Other chemical principles include polymeric re‐entanglement, metal‐ligand interactions, π–π stacking, and metathesis . However, intrinsic systems always require external stimuli (i.e., temperature, light, pH, moisture, or pressure,) and are not capable of damage self‐sensing. Furthermore, large‐area self‐healing is still a challenging issue because the solid properties of polymeric networks result in insufficient fluidity for the diffusion of healing materials.…”

Section: Methodsmentioning

confidence: 99%

Biologically Inspired Materials Exhibiting Repeatable Regeneration with Self‐Sealing Capabilities without External Stimuli or Catalysts

et al. 2016

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A new insect-cuticle- and fruit-browning-mimetic film exhibiting simultaneous self-healing and self-sealing properties only by ambient oxygen without external stimuli is developed. The film is formed at the liquid/air interface via crosslinking of phenolic compounds and poly(amine) chains. The film can be self-healed over a hundred times under ambient air at room temperature without exogenous materials and stimuli.

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Section: Methodsmentioning

confidence: 99%

Biologically Inspired Materials Exhibiting Repeatable Regeneration with Self‐Sealing Capabilities without External Stimuli or Catalysts

et al. 2016

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“…Swelling or softening is necessary because cracks tend to be on the micrometer scale (26), whereas the BMI molecule is approximately 1.3 nm in length. Figure 13 shows how swelling improves the amount of covalent bonding.…”

Section: Thermomechanical Polymer Characterization T G Smentioning

confidence: 99%

Room-Temperature Healing of a Thermosetting Polymer Using the Diels−Alder Reaction

Peterson

Jensen

Palmese

2010

ACS Appl. Mater. Interfaces

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177

148

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Self-healing materials are particularly desirable for load-bearing applications because they offer the potential for increased safety and material lifetimes. A furan-functionalized polymer network was designed that can heal via covalent bonding across the crack surface with the use of a healing agent consisting of a bismaleimide in solution. Average healing efficiencies of approximately 70% were observed. The healing ability of fiber-reinforced composite specimens was investigated with flexural, short beam shear, and double cantilever beam specimens. It was found that solvent amount and maleimide concentration play key roles in determining healing efficiency.

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“…These counterintuitive and negative effects of pressure on the strength of polymer interfaces have already been observed in some papers dealing with crack healing . Wool et al .…”

Section: Introductionmentioning

confidence: 78%

Effects of pressure on poly(ether‐ether‐ketone) (PEEK) sintering mechanisms

Sébileau

Lemonnier

Barraud

et al. 2019

J of Applied Polymer Sci

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This study deals with the understanding of the sintering mechanisms that occur during consolidation of an ultra-highperformance polymer: poly (ether-ether-ketone). In particular, we investigated the effects of uniaxial pressure during spark plasma sintering (SPS) processing. Glass-transition temperature (T g ) measurements under loading, stress-strain curves and scanning electron microscopy analysis allowed us to determine the role of pressure intensity and temperature of application on macromolecular chain mobility in both the bulk and the surface of the particles. First, a loss of chain mobility in the bulk of the particles was observed under high pressure. Second, it was shown that high pressure applied at low temperature leads to friction effects between the particles which enhances chain mobility in the particle shell through a local melting phenomenon. These experimental conditions favor the healing of particles and high cohesion was then observed in the resulting sintered samples. The level of friction is enhanced when pressure is applied at a low temperature since the powders are still in a glassy state. Finally, the achievement of cohesive grain boundaries was found to be related to the location and conformation of chain ends. Good healing between particles can only occur if a sufficient number of chain ends are available at the surface of the particle shell. We showed that the native powder state plays a significant role. The direct use of as-received powder leads to final material exhibiting good cohesion whereas pretreatments of the native powder are highly detrimental. It should be noted that this processing does not affect the high initial degree of crystallinity because no bulk melting is observed during consolidation by sintering.

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Crack‐healing behavior of epoxy–amine thermosets

Abstract: in Wiley InterScience (www.interscience.wiley.com).

Cited by 60 publications

References 37 publications

Biologically Inspired Materials Exhibiting Repeatable Regeneration with Self‐Sealing Capabilities without External Stimuli or Catalysts

Biologically Inspired Materials Exhibiting Repeatable Regeneration with Self‐Sealing Capabilities without External Stimuli or Catalysts

Room-Temperature Healing of a Thermosetting Polymer Using the Diels−Alder Reaction

Effects of pressure on poly(ether‐ether‐ketone) (PEEK) sintering mechanisms

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