Influence of thermoplastic diffusion on morphology gradient and on delamination toughness of RTM-manufactured composites

Velthem, Pascal Van; Ballout, Wael; Daoust, Daniel; Sclavons, Michel; Cordenier, F.; Henry, E.; Dumont, D.; Destoop, Vincent; Pardoen, Thomas; Bailly, Christian

doi:10.1016/j.compositesa.2015.02.012

Cited by 43 publications

(25 citation statements)

References 25 publications

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“…Indeed, extensive dissolution of phenoxy in RTM epoxy during a typical curing cycle has been previously demonstrated [39] and is expected to result in a broad spatial distribution of the TP in the final blend. Dissolution of nanocomposite filaments and the composition gradients resulting from the interdiffusion are studied in the following subsections.…”

Section: Resultsmentioning

confidence: 95%

“…15. This figure first recalls the main result from [39] that the presence of phenoxy alone (introduced as films between the CF fabric layers) significantly improves G Ic by 25%. This is the reference point to discuss the specific influence of the two nanofillers pre-dispersed in phenoxy (and hence carried by the thermoplastic films).…”

Section: Fracture Toughnessmentioning

confidence: 88%

“…In the reference case (no nanofillers present), phenoxy and RTM6 precursors are clearly able to interdiffuse through the carbon fabric before the gel point is reached, leading to a toughening of the resin rich interplay regions [39]. When nanofillers have been predispersed in phenoxy, they can be filtered by the carbon fabric when the same diffusion process takes place.…”

Section: Fracture Toughnessmentioning

confidence: 97%

“…A typical cure cycle for RTM6 consists of a 1°C/min ramp from 80°C to 180°C followed by a 180°C isothermal step during 2 h. However, based on previous studies [38,39] about thermal dissolution and interdiffusion of phenoxy filaments in RTM6 resin, a modified curing profile has been used to maximize phenoxy diffusion before the occurrence of cross-linking. The modified RTM cycle is as follows: 1°C/min ramp from 80°C to 120°C, followed by 30 min isotherm, followed by 1°C/min ramp up to the 180°C, followed by isotherm for 2 h.…”

Section: Composite Laminate Manufacturingmentioning

confidence: 99%

See 3 more Smart Citations

Phenoxy nanocomposite carriers for delivery of nanofillers in epoxy matrix for resin transfer molding (RTM)-manufactured composites

Velthem

Ballout

Dumont

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Section: Resultsmentioning

confidence: 95%

Section: Fracture Toughnessmentioning

confidence: 88%

Section: Fracture Toughnessmentioning

confidence: 97%

Section: Composite Laminate Manufacturingmentioning

confidence: 99%

See 2 more Smart Citations

Phenoxy nanocomposite carriers for delivery of nanofillers in epoxy matrix for resin transfer molding (RTM)-manufactured composites

Velthem

Ballout

Dumont

et al. 2015

Composites Part A: Applied Science and Manufacturing

Self Cite

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“…Among these techniques, matrix-toughening is one of the most suitable methods, 3 where an increase in delamination toughness may result by inserting interleaf layers of toughened materials between the layers on the fabrication process of the laminate [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Effect of PVDF nanofibers on the fracture behavior of composite laminates for high-speed woodworking machines

Fotouhi

Saghafi

Brugo

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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The use of light composites when designing fast moving parts for machine tools is emerging as a very efficient solution for improving productivity. Nevertheless several aspects of these materials have to be carefully considered in woodworking. This paper aims to investigate the effect of interleaved nanofiber on mode I interlaminar properties and the failure modes that occur in this mode. For this purpose, woven carbon/epoxy laminates with and without Polyvinylidene difluoride nanofibers in the mid-plane were subjected to mode I interlaminar loading and the results were compared with each other. Acoustic Emission technique was also utilized for better understanding of the failure modes that occurred in the virgin and nanofibersmodified specimens. Mechanical data and acoustic emission parameters associated with pattern recognition analyses were used for investigation of the interlaminar properties and the occurred failure modes. The mechanical results showed that the electrospun nanofibrous mat was able to increase the GIC by 98%. The AE results highlighted that different failure modes were the origin of different interlaminar failure behaviors. Different percentages of the failure modes in the 2 modified specimens compared with the virgin ones were observed. Furthermore, the number of occurred interlaminar failure modes diminished in the modified composite layers.

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A very low concentration of polybenzimidazole film interleaved bismaleimide/diallyl bisphenol a system with outstanding improvement in impact strength and excellent allround properties

et al. 2017

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A very low concentration of thermoplastic polybenzimidazole (PBI) film interleaved bismaleimide/diallyl bisphenol A (BMI/DBA) system with sandwich structure was designed for the outstanding impact resistance. The effects of PBI film layers (05) on the mechanical, thermal, dielectric properties and flame retardancy of BMI/ DBA were investigated. BMI/DBA interleaved with 5layer PBI film demonstrates a 274% increase in impact strength relative to BMI/DBA, and exhibits higher fracture toughness, flexural strength and modulus than BMI/ DBA. The improvement in the mechanical property for PBI film interleaved BMI/DBA system is mainly attributed to the combined effects of the effective energy dissipation of the sandwich structure and the good interfacial bonding between PBI film and the matrix. Due to the high thermal stability of PBI, the effective thermal insulation and electromagnetic field barrier of PBI film in the sandwich structure and the increase of the reacted C@C in resin system, PBI film interleaved BMI/DBA shows better thermal property, much higher flame retardancy and lower dielectric constant compared to BMI/DBA. In addition, when the same amount of PBI is applied, BMI/ DBA interleaved with PBI film exhibits much better comprehensive properties than BMI/DBA with PBI particles for the sandwich structure. POLYM. COMPOS., 00:000-000, 2017.

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Influence of thermoplastic diffusion on morphology gradient and on delamination toughness of RTM-manufactured composites

Cited by 43 publications

References 25 publications

Phenoxy nanocomposite carriers for delivery of nanofillers in epoxy matrix for resin transfer molding (RTM)-manufactured composites

Phenoxy nanocomposite carriers for delivery of nanofillers in epoxy matrix for resin transfer molding (RTM)-manufactured composites

Effect of PVDF nanofibers on the fracture behavior of composite laminates for high-speed woodworking machines

A very low concentration of polybenzimidazole film interleaved bismaleimide/diallyl bisphenol a system with outstanding improvement in impact strength and excellent allround properties

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