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Understanding the molecular mechanisms involved in the interfacial self-healing of supramolecular rubbers

Bose, R.K. (author), Garcia Espallargas, S.J. (author), Van der Zwaag, S. (author)

Supramolecular rubbers based on 2-aminoethylimidazolidone and fatty acids with epoxy crosslinks have been shown to self-heal via multiple hydrogen bonding sites. In this work, several tools are used to investigate the molecular mechanisms taking place at the interface to understand cohesive healing in these polymers. The quantification of self...

conference paper 2013

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The role of clusters on the healing efficiency of a modified Zn based ionomer

Vega, J.M. (author), Van der Zwaag, S. (author), Garcia Espallargas, S.J. (author)

Poly(ethylene-co-methacrylic acid) (EMAA) ionomers have shown healing capabilities in both ballistic and static tests. In previous studies it was shown that the degree of crosslinking (clusters) affects (positively or negatively) the healing under impact tests. Moreover, it has also been reported that the modification of the ionomers by...

conference paper 2013

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Healing particles in self-healing thermal barrier coatings

Derelioglu, Z. (author), Ponnusami, S.A. (author), Turteltaub, S. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)

Crack healing in ceramic thermal barrier coatings (TBCs) may be realized by embedding Mo-Si based particles in the thermal barrier coating. Upon cracking, these particles are exposed to oxygen that permeates through the top layer and the crack gap is filled with SiO2 which is produced from oxidation at high temperature. Due to its amorphous...

conference paper 2013

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Self-healing metallopolymers: Detailed inverstigation of the self-healing properties by scratch testing

Bode, S. (author), Bose, R. (author), Sandmann, B. (author), Hager, M.D. (author), Garcia, S.J. (author), Van der Zwaag, S. (author), Schubert, U.S. (author)

In the last decade several intrinsic self-healing materials have been developed in which the healing mechanism was mainly based on the reversibility of a certain structural element. For this purpose, reversible covalent bonds, e.g., based on the Diels-Alder reaction or weaker non-covalent interactions, e.g., hydrogen bonding, ionic interactions...

conference paper 2013

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The effect of grain size on the mechanical properties and the oxidation induced crack healing efficiency of CR2ALC ceramic

Duan, X. (author), Jia, D. (author), Yang, Z. (author), Zhou, Y. (author), Ouyang, J. (author), Sloof, W.G. (author), Van der Zwaag, S. (author)

Abstract only.

conference paper 2013

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Microstructure evolution of Cr2AlC ceramic before and after oxidation induced crack healing

Rao, J. (author), Jia, D. (author), Duan, X. (author), Yang, Z. (author), Zhou, Y. (author), Ouyang, J. (author), Sloof, W.G. (author), Van der Zwaag, S. (author)

Abstract only.

conference paper 2013

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Monitoring the restoration of interfacial contact for self healing thermal interface materials for LED and microelectronic applications

Lafont, U. (author), Van Zeijl, H.W. (author), Van der Zwaag, S. (author)

While conventional self healing materials focus on the restoration of mechanical properties, newer generations of self healing materials focus on the restoration of other functional (i.e. non-mechanical) properties. Thermal conductivity is an example of an important functional property of a Thermal Interface Material (TIM) for LED’s and...

conference paper 2013

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Compartemented fibres: The concept of multiple self-healing in advanced fibre composites

Prajer, M. (author), Wu, X. (author), Garcia Espallargas, S.J. (author), Van der Zwaag, S. (author)

Polymers reinforced with high performance fibres are successfully replacing metal alloys in lightweight aircraft structures. A critical factor in structural design is the resistance of a structure to progressive damage which develops during its service time. The brittle nature of matrix cracking is the main source of composite failure initiating...

conference paper 2013

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A cohesive element based model to describe facture and cohesive healing in elastomers

Baldi, A. (author), Grande, A.M. (author), Bose, R.K. (author), Airoldi, A. (author), Garcia Espallargas, S.J. (author), Di Liandro, L. (author), Van der Zwaag, S. (author)

Several polymeric systems with intrinsic Self-Healing (SH) capabilities have been reported in literature. Many of them showed healing upon contact across the crack interface. Different parameters such as contact time, temperature, pressure or chemical activity determine the degree of healing obtained. In this work, a numerical simulation of the...

conference paper 2013

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Self healing by Cu precipitation in deformed Fe-Cu-B-N-C

Zhang, S. (author), Langelaan, G. (author), Schut, H. (author), Brück, E. (author), Van der Zwaag, S. (author), Van Dijk, N.H. (author)

Steels are among the most widely used construction materials as their mechanical properties can be tuned over a very wide range of desired combinations of strength formability and other properties. However, when exposed for long times to high temperatures steel components can exhibit premature and low-ductility creep fracture, which arises from...

conference paper 2013

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Oxidation induced crack healing of CR2(AL,SI)C MAX phase ceramic

Shen, L. (author), Li, S.B. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)

The oxidation crack healing of Cr2AlC and Cr2(Al,Si)C was studied and compared with known healing of Ti2AlC. The oxidation induced crack healing of Ti2AlC is relatively fast and leads to full strength recovery, but the oxidation product contains besides ?-Al2O3 also undesired TiO2. However, when oxidizing Cr2AlC only ?-Al2O3 is formed, but full...

conference paper 2013

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A conceptual study into the potential of MAX-phase ceramics for self-healing of crack damage

Farle, A. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)

The reduction of maintenance and replacement work costs is an important driving force in the development of high temperature materials (T>800 °C) that can autonomously heal damage as a result of local cracks. In recent years some potential routes involving the addition of sacrificial particles have been identified, yet these systems have the...

conference paper 2013

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A study of the temperature dependent healing capabilities of new polymers based on Diels-Adler cycloaddition

Kötteritzsch, J. (author), Hager, M.D. (author), Schubert, U.S. (author), Bose, R.K. (author), Garcia Espallargas, S.J. (author), Van der Zwaag, S. (author)

Because of its thermal reversibility, the retro-Diels-Alder (RDA) reaction represents an appealing possibility to produce self-healing polymers with well-defined architectures and tunable properties [1]. However, the polymer architecture for which the Diels-Alder (DA) reaction can best be used to contribute to the healing process is still not...

conference paper 2013

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The effect of SiC particle size on the healing efficiency of alumina at high temperatures

Boatemaa, L. (author), Zhou, J. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)

Structural ceramics like alumina are usually brittle and sensitive to flaws leading to a reduction in their mechanical properties. This situation is worsened by machining prior to service and during service by contact, which introduces micro cracks and hidden damages. Crack damage can easily be developed in such ceramics when loaded, which often...

conference paper 2013

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Enhancing the creep life of steels by self-healing through dynamic in-service precipitation

Langelaan, G. (author), Zhang, S. (author), Brück, E. (author), Van der Zwaag, S. (author), Van Dijk, N.H. (author)

Abstract only.

conference paper 2013

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Multiple healing in multi-functional polymer composites

Lafont, U. (author), Van Zeijl, H. (author), Van der Zwaag, S. (author)

In this work, we investigate the formation of self-healing systems that are able to recover more than once more than one (mechanical or other physical) functionality. To this aim composites were created consisting of a polysulfide thermoset rubber matrix having intrinsic self-healing properties filled with thermally/electrically conductive...

conference paper 2013

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Encapsulation of sacrificial silicon containing particles for SH oxide ceramics via a boehmite precursor route

Carabat, A.L. (author), Van der Zwaag, S. (author), Sloof, W.G. (author)

Easy crack propagation in oxide ceramic coatings limits their application in high temperature environment (e.g. such as engines and gas turbine components) [1]. In order to overcome this problem, incorporation of sacrificial particles into an oxide ceramic coating may be a viable option. Particles of silicon compounds, such as: Si3N4, SiC, MoSi2...

conference paper 2013

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Postponing crack nucleation in supersaturated xxxx aluminium alloys

Mahdavi Shahri, M. (author), Schut, H. (author), Van der Zwaag, S. (author), Alderliesten, R. (author)

Abstract only.

conference paper 2013

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On the healing mechanism of sol-gel derived hybrid materials containing dynamic di-sulfide bonds

AbdolahZadeh, M. (author), Esteves, A.C.C. (author), Van der Zwaag, S. (author), Garcia Espallargas, S.J. (author)

Sol-gel technology is increasingly being used in coatings for corrosion protection and adhesion improvement. So far, the self-healing concept in sol-gel coatings has only been approached from extrinsic healing perspective (i.e. use of nano and micro carriers of corrosion inhibitors) [1]. Despite the benefits of this approach, the damaged area...

conference paper 2013

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Model based design of self-healing expandable coatings under different environmental conditions

Javierre, E. (author), Camanes, V. (author), Garcia Espallargas, S.J. (author), Van der Zwaag, S. (author), Garcia-Aznar, J.M. (author)

A long-lasting barrier protection at damaged sites of coated system can be achieved by means of an active response of the primer. This may be attained through the release of reactive liquids from dispersed containers, the increase of the local mobility of the polymeric network, or the expansion of (dispersed elements in) the primer [1]. Such...

conference paper 2013