Toughening and healing of continuous fibre reinforced composites by supramolecular polymers

Kostopoulos, V.; Κοτρώτσος, Αθανάσιος; Tsantzalis, S.; Tsokanas, Panayiotis; Λούτας, Θεόδωρος; Bosman, Anton W.

doi:10.1016/j.compscitech.2016.03.021

Cited by 44 publications

(36 citation statements)

References 34 publications

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“…It is evident in Figure 5 that the AE activity is significantly less in the hybrid case despite the fact that the test lasts much longer and the specimen experiences much higher loading and displacement. A similar behavior was observed in a previous work [29] in which the AE characteristics were strongly reduced during mode I experiments of hybrid CFRPs containing the same material interleaf. For the hybrid samples the AE activity is much higher at the fracture point in comparison to the point in which the crack initiates as anticipated.…”

Section: Mode II Fracture Toughness: Reference Vssupporting

confidence: 71%

“…This observation indicates that the interface of the interleaf to the host matrix is stronger than the properties of the interleaf, thus guiding the crack to a lower energy path through the interleaf [29]. This behavior essentially maximizes the effectiveness of the interleaf and explains the higher resistance to crack propagation.…”

Section: Mode II Fracture Toughness: Reference Vsmentioning

confidence: 85%

“…This study is presenting an overview of the role of the SP in the fracture behavior and the repeatable ability to heal the cracks into CFRPs. It is complementing and extending the work of study [29] where mode I fracture was investigated. Here, reference as well as the hybrid composites were subjected to mode II interlaminar fracture toughness tests and compared.…”

mentioning

confidence: 80%

“…For brittle materials the moment of unstable crack growth can be clearly determined; P max is attributed to the critical load at the onset of crack growth. On the other hand, for hybrid materials containing ductile interleaves in which the crack is growing through the ductile interleaved layer [29], the crack initiation occurs long before P max . In addition, in mode II loading of the pre-cracked specimen the crack tends to close which hinder a clear visualization of its tip.…”

Section: Mechanical Testing and Ae Monitoringmentioning

confidence: 99%

“…The as-received polymer piece was converted into a thin film by a two-step heating/pressing treatment using a hot press machine [29]. Firstly, the bulk SP block was pressed under 5 kN at 90 °C for 30 min.…”

Section: Preparation Of Sp Interleaf and Composite Manufacturingmentioning

confidence: 99%

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Mode II fracture toughening and healing of composites using supramolecular polymer interlayers

Kostopoulos¹,

Κοτρώτσος²,

Baltopoulos³

et al. 2016

Express Polym. Lett.

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Abstract. This study focuses on the transfer of the healing functionality of supramolecular polymers (SP) to fibre reinforced composites through interleaving. SPs exhibiting self-healing based on hydrogen bonds were formed into films and were successfully incorporated into carbon fibre composites. The effect of the SP interleaves on in-plane fracture toughness and the subsequent healing capability of the hybrid composites were investigated under mode II fracture loading. The fracture toughness showed considerable increase since the maximum load (P max ) of the hybrid composite approximately doubled, and consequently the mode II interlaminar fracture toughness energy (G IIC ) exhibited an increase reaching nearly 100% compared to the reference composite. The healing component was activated using external heat. P max and G IIC recovery after activation were measured, exhibiting a healing efficiency after the first healing cycle close to 85% for Pmax and 100% for G IIC , eventually dropping to 80% for P max while G IIC was retained around 100% even after the fourth healing cycle. Acoustic Emission activity during the tests was monitored and was found to be strongly reduced due to the presence of the SP.

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Section: Mode II Fracture Toughness: Reference Vssupporting

confidence: 71%

Section: Mode II Fracture Toughness: Reference Vsmentioning

confidence: 85%

mentioning

confidence: 80%

Section: Mechanical Testing and Ae Monitoringmentioning

confidence: 99%

Section: Preparation Of Sp Interleaf and Composite Manufacturingmentioning

confidence: 99%

See 3 more Smart Citations

Mode II fracture toughening and healing of composites using supramolecular polymer interlayers

Kostopoulos¹,

Κοτρώτσος²,

Baltopoulos³

et al. 2016

Express Polym. Lett.

Self Cite

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Smart Epoxy Composites

Eslami‐Farsani

Ebrahimnezhad‐Khaljiri

2021

Epoxy Composites

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Scratch‐Resistant Hydrophobic Coating with Supramolecular‐Polymer Co‐Assembly

Lee,

Saura‐Sanmartin,

Schalley

2023

Adv Funct Materials

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Supramolecular assembly for superhydrophobic coatings is known for its efficiency and efficacy. However, the mechanical fragility of the coatings limits their use as coating materials. Herein, the combination of (±)‐N,N'‐(trans‐cyclohexane‐1,2‐diyl)‐bis(perfluorooctanamide) CF7, a cyclohexyl diamide‐based low molecular weight gelator, with acrylate polymers for the generation of semi‐transparent omniphobic coatings with significantly enhanced scratch proofness is presented. CF7 has shown the ability to self‐assemble in common solvents into highly entangled fibrous networks with extreme water repellency. The incorporation of covalent polymers, specifically poly(methyl methacrylate) (PMMA) and poly(trifluoroethyl methacrylate) (PTFEMA), helps to fixate the supramolecular CF7 fibers without interfering with the self‐assembled structures. The resulting coatings, namely CF7/PMMA and CF7/PTFEMA, show significantly improved mechanical resistance as well as optical transparency while maintaining excellent water and oil repellency. Furthermore, the homogeneity of the coating in bulk is confirmed by depth profiling of the 3D distribution of the components using time‐of‐flight secondary ion mass spectrometry imaging, which turns out to be an essential technique in order to characterize such materials.

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Toughening and healing of continuous fibre reinforced composites by supramolecular polymers

Cited by 44 publications

References 34 publications

Mode II fracture toughening and healing of composites using supramolecular polymer interlayers

Mode II fracture toughening and healing of composites using supramolecular polymer interlayers

Smart Epoxy Composites

Scratch‐Resistant Hydrophobic Coating with Supramolecular‐Polymer Co‐Assembly

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