Experimental study of the CTBN effect on mechanical properties and mode I and II fracture toughness of a new epoxy resin

Dadian, Alireza; Rahnama, Saeed; Zolfaghari, Abbas

doi:10.1080/01694243.2020.1763540

Cited by 19 publications

(11 citation statements)

References 22 publications

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“…The significant tensile properties calculated from these curves are presented in Table 4 and Table 5. It is well known from the literature [10,13,15,29,30] that modification of epoxy with rubber decreases the tensile strength and elasticity modulus. Generally, this reduction is attributed to the low modulus of elasticity of the rubber phase and the reduction of the crosslink density of the epoxy during curing.…”

Section: Tensile Propertiesmentioning

confidence: 99%

Characterization of Mechanical of CTBN Liquid Rubber‐Modified Epoxy Cured by Anhydride- and Amine-Based Agent

Sepetcioglu

2021

European Mechanical Science

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The main purpose of this work is to reveal the effects of carboxyl-terminated butadiene-acrylonitrile (CTBN) rubber particles on the tensile and fracture behavior of CTBN/epoxy blends cured with anhydride-and aminebased agents. In this study, 1 wt.%, 3 wt.%, 5 wt.%, 7 wt.%, 10 wt.% and 15 wt.% CTBN were added to two different epoxy systems. The CTBN/epoxy blends were prepared by ultrasonic mixing device, and curing processes were determined by DSC analysis. As CTBN fraction by weight increased in both epoxy systems, a decrease in tensile strength and modulus was detected, but deformation ability improved. The fracture toughness of CTBN/epoxy blends cured with the amine-based agent increased up to 10 wt.% CTBN addition. However, fracture toughness decreased when 15% by weight of CTBN was added to the epoxy matrix. The average rubber particle size was found to have a significant effect on the fracture toughness of CTBN/epoxy blends. Compared to pure epoxy, fracture toughness was increased approximately 3.5-fold in 10 wt.% CTBN/epoxy blend cured with the aminebased agent. In CTBN/epoxy blends cured with the amine-based agent, CTBN shifted the reaction rate and thus it was provided better control over CTBN particle size in the CTBN/epoxy cured. The toughening mechanisms induced by CTBN, such as rubber cavitation and matrix shear banding, contributed to the enhanced fracture toughness of the CTBN/epoxy cured with the amine-based agent.

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Section: Tensile Propertiesmentioning

confidence: 99%

Characterization of Mechanical of CTBN Liquid Rubber‐Modified Epoxy Cured by Anhydride- and Amine-Based Agent

Sepetcioglu

2021

European Mechanical Science

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“…Epoxy adhesive is widely used as a structural adhesive. However, in its neat formulation, it undergoes brittle fracturing, with a low fracture toughness, which represents a significant limitation for its application in the structural field [11,12]. Joints bonded with brittle epoxy adhesive are defect-sensitive and exhibit broad strength dispersion due to scatter in flaw sizes.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of XD 10 Polyamide Electrospun Nanofibers to Improve Mode I Fracture Toughness for Epoxy Adhesive Film Bonded Joints

2023

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The demand for ever-lighter structures raises the interest in bonding as a joining method, especially for materials that are difficult to join with traditional welding and bolting techniques. Structural adhesives, however, are susceptible to defects, but can be toughened in several ways: by changing their chemical composition or by adding fillers, even of nanometric size. Nanomaterials have a high surface area and limited structural defects, which can enhance the mechanical properties of adhesives depending on their nature, quantity, size, and interfacial adhesion. This work analyzes the Mode I fracture toughness of joints bonded with METLBOND® 1515-4M epoxy film and XantuLayr electrospun XD 10 polyamide nanofibers. Two joint configurations were studied, which differed according to the position of the nanomat within the adhesive layer: one had the nanofibers at the substrate/adhesive interfaces, and the other had the nanofibers in the center of the adhesive layer. Double cantilever beam joints were manufactured to evaluate the Mode I fracture toughness of the bonding with and without nano-reinforcement. The nanofibers applied at the substrate/adhesive interface improved the Mode-I fracture toughness by 32%, reaching the value of 0.55 N/mm. SEM images confirm the positive contribution of the nanofibers, which appear stretched and pulled out from the matrix. No fracture toughness variation was detected in the joints with the nanofibers placed in the middle of the adhesive layer.

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“…In the modern polymer industry, epoxy resins (EPs) are widely used in many elds such as transportation, aerospace, electronic packing materials, and coatings owing to their superior tensile strength, chemical stability, and strong cohesiveness. [1][2][3][4] However, neat EP with high ammability can easily result in a re risk, which restricts its use in specic elds. Hence, it is important to reduce the re risk of EP to further broaden its engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Bio-based arginine surface-modified ammonium polyphosphate: an efficient intumescent flame retardant for epoxy resin

Cheng¹,

Wang

Lü³

et al. 2022

RSC Adv.

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Experimental study of the CTBN effect on mechanical properties and mode I and II fracture toughness of a new epoxy resin

Cited by 19 publications

References 22 publications

Characterization of Mechanical of CTBN Liquid Rubber‐Modified Epoxy Cured by Anhydride- and Amine-Based Agent

Characterization of Mechanical of CTBN Liquid Rubber‐Modified Epoxy Cured by Anhydride- and Amine-Based Agent

Evaluation of XD 10 Polyamide Electrospun Nanofibers to Improve Mode I Fracture Toughness for Epoxy Adhesive Film Bonded Joints

Bio-based arginine surface-modified ammonium polyphosphate: an efficient intumescent flame retardant for epoxy resin

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