Specific influence of polyethersulfone functionalization on the delamination toughness of modified carbon fiber reinforced polymer processed by resin transfer molding

The specific influence of polyethersulfone (PES) end‐functionalization with chlorine or hydroxyl end groups at same molar mass on PES‐epoxy composites based on a high‐performance tetra‐epoxide with di‐amine hardener resin (RTM6) is investigated in terms of morphology, thermal behavior, and toughness...

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Published in:Polymer engineering and science 2019-05, Vol.59 (5), p.996-1009
Main Authors: Ballout, W., Van Velthem, P., Magnin, D., Henry, E., Sclavons, M., Pardoen, T., Bailly, C.
Format: Article
Language:English
Subjects:
Amines
Carbon fiber reinforced plastics
Chemical properties
Chlorine
Electron microscopy
Epoxy resins
Fiber reinforced polymers
Filaments
Fracture mechanics
Fracture surfaces
Fracture toughness
Heating rate
Hydroxides
Interdiffusion
Laminates
Mechanical properties
Methods
Microscopy
Miscibility
Morphology
Panels
Plastics molding
Polyethersulfone
Polyethersulfones
Polymer industry
Polymer matrix composites
Polymers
Production processes
Reinforced plastics
Resin transfer molding
Scanning electron microscopy
Spectroscopy
Thermodynamic properties
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Summary:The specific influence of polyethersulfone (PES) end‐functionalization with chlorine or hydroxyl end groups at same molar mass on PES‐epoxy composites based on a high‐performance tetra‐epoxide with di‐amine hardener resin (RTM6) is investigated in terms of morphology, thermal behavior, and toughness. A model study on PES filaments embedded in epoxy precursor is first performed to compare the interdiffusion and resulting morphology upon curing. PES‐OH shows a larger interdiffusion distance compared to PES‐Cl in the model systems and the laminates. This effect is more pronounced at high heating rate. Cross sections and fracture surfaces of composite panels are analyzed by scanning electron microscopy (SEM) coupled with energy dispersive X‐ray (EDX) spectroscopy to establish the link between the microstructures and fracture mechanisms. The toughness of PES‐OH‐modified epoxy composites is doubled compared to unmodified reference panels, whereas the PES‐Cl shows no improvement. The favorable influence of PES‐OH is ascribed to enhanced miscibility, interfacial adhesion and morphology, resulting from the better affinity between hydroxyl‐terminated PES and the epoxy‐resin. POLYM. ENG. SCI., 59:996–1009, 2019. © 2019 Society of Plastics Engineers
ISSN:0032-3888
1548-2634
DOI:10.1002/pen.25055