Fatigue behaviour of open-hole carbon fibre/epoxy composites containing bis-maleimide based polymer blend interleaves as self-healing agent

Microencapsulated E-51 epoxy resin healing agent and phthalic anhydride latent curing agent were incorporated into E-44 epoxy matrix to prepare self-healing epoxy composites. When cracks were initiated or propagated in the composites, the microcapsules would be damaged and the healing agent released. As a result, the crack plane was healed through curing reaction of the released epoxy latent curing agent. In the paper, PUF/E-51 microcapsules were prepared by in-situ polymerization. The mechanical properties of the epoxy composites filled with the self-healing system were evaluated. The impact strength and self-healing efficiency of the composites are measured using a Charpy Impact Tester. Both the virgin and healed impact strength depends strongly on the concentration of microcapsules added into the epoxy matrix. Fracture of the neat epoxy is brittle, exhibiting a mirror fracture surface. Addition of PUF/E-51 microcapsules decreases the impact strength and induces a change in the fracture plane morphology to hackle markings. In the case of 8.0 wt% microcapsules and 3.0 wt% latent hardener, the self-healing epoxy exhibited 81.5% recovery of its original fracture toughness.

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Fatigue behaviour of oil palm fruit bunch fibre/epoxy and carbon fibre/epoxy composites

Composite Structures ◽

10.1016/j.compstruct.2004.09.034 ◽

2005 ◽

Vol 71 (1) ◽

pp. 34-44 ◽

Cited By ~ 59

Author(s):

Anizah Kalam ◽

B.B. Sahari ◽

Y.A. Khalid ◽

S.V. Wong

Keyword(s):

Carbon Fibre ◽

Oil Palm ◽

Fatigue Behaviour ◽

Epoxy Composites ◽

Palm Fruit

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Self-Healing Epoxy Composites – Part II: Healing Performance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.716.387 ◽

2013 ◽

Vol 716 ◽

pp. 387-390

Author(s):

Tao Yin ◽

Min Zhi Rong ◽

Ming Qiu Zhang

Keyword(s):

Fracture Toughness ◽

Epoxy Composites ◽

Repair System ◽

Self Healing ◽

Single Edge ◽

Healing Efficiency ◽

Two Component ◽

Before And After ◽

Healing Agent

Epoxy composites were provided with healing capability by pre-dispersing a novel repair system in the composites matrix cured by 2-ethyl-4-methylimidazole (2E4MIm). The healing agent consisted of ureaformaldehyde microcapsules containing epoxy and latent hardener CuBr2(2-MeIm)4 (the complex of CuBr2 and 2-methylimidazole). Single-edge notched bending (SENB) test were conducted to evaluate fracture toughness of the composites before and after healing. Moreover, healing efficiency was studied as a function of the content of the two-component healing agents. It was found that a healing efficiency of 173% relative to the fracture toughness of virgin composites was obtained in the case of 15 wt% epoxy-loaded microcapsules and 3 wt% CuBr2(2-MeIm)4.

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Mechanical Properties of Self-Healing Carbon Fibre Fabric Reinforced Polymers (CFFRP)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.700.107 ◽

2013 ◽

Vol 700 ◽

pp. 107-110

Author(s):

Eng Har Lim ◽

Kim Pickering

Keyword(s):

Carbon Fibre ◽

Composite Laminates ◽

Failure Strain ◽

Tensile Modulus ◽

Flexural Properties ◽

Self Healing ◽

Reinforced Polymers ◽

Fabric Composite ◽

Healing Agent ◽

Flexural Tests

In this paper, carbon fibre fabric reinforced polymeric composites with the capability of self-healing were studied. These fabric-composite laminates were fabricated by hand lay-up of plain weave (PW) carbon fibre fabrics impregnated with polymer blends of epoxy resin and thermoplastic healing agent. Laminates containing different amounts of healing agent (0, 10wt% and 20wt% by weight of epoxy) were evaluated by tensile and three-point flexural tests according to the ASTM D3039/D3039M and D790, respectively. Aside of the potential for self-healing, benefits were found in terms of tensile and flexural properties. Overall, tensile properties were improved with addition of thermoplastic healing agent; the highest tensile strength and failure strain were obtained with the highest healing agent amount (20wt%) whilst the maximum tensile modulus was obtained at 10wt%. In general, flexural properties were also improved except flexural strain; the highest flexural strength and modulus were determined at 10wt%.

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Self-Healing Epoxy Composites – Part I: Curing Kinetics and Heat-Resistant Performance

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.716.383 ◽

2013 ◽

Vol 716 ◽

pp. 383-386 ◽

Cited By ~ 1

Author(s):

Tao Yin ◽

Min Zhi Rong ◽

Ming Qiu Zhang

Keyword(s):

Deformation Temperature ◽

Urea Formaldehyde ◽

Curing Kinetics ◽

Epoxy Composites ◽

Self Healing ◽

Curing Process ◽

Heat Resistant ◽

Two Component ◽

Healing Agent ◽

Heat Deformation

This paper reports a study of self-healing epoxy composites. The healing agent was a two-component one synthesized in the authors laboratory, which consisted of epoxy-loaded urea-formaldehyde microcapsules as the polymerizable binder and CuBr2(2-MeIm)4 (the complex of CuBr2 and 2-methylimidazole) as the latent hardener. Both the microcapsules and the matching catalyst were pre-embedded and pre-dissolved in the composites matrix cured by 2-ethyl-4-methylimidazole (2E4MIm), respectively. The data of curing kinetics show that the latent hardener CuBr2(2-MeIm)4 is not affected during the curing process of 2 h at 80°C, 2 h at 120°C and 2 h at 140°C, and heat deformation temperature of composites consisting of 2 wt% CuBr2(2-MeIm)4 and 5 wt% mcirocapsules cured at the same curing process is 180.2°C.

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