The bonding mechanism of aramid fibres to epoxy matrices

Kalantar, J.; Drzal, Lawrence T.

doi:10.1007/bf00581072

Cited by 71 publications

(31 citation statements)

References 8 publications

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“…The bonding between these brils is rather weak, which makes the bers susceptible to damage due to external abrasion as well as causes low compression strength. The weak inter-bril bonds also limit the degree of improvement in aramid / matrix interfacial bond strength since the brils on surface of the ber can be peeled away before the ber /matrix interface fails [32,33]. To improve inter bril bond strength, Mathur and Netravali [34] used epoxy and bismaleimide to in ltrate the inter bril space of aramid bers after swelling the bers with concentrated sulfuric acid.…”

Section: Single Ber Tensile Strengthmentioning

confidence: 98%

Effects of atmospheric pressure helium/air plasma treatment on adhesion and mechanical properties of aramid fibers

Hwang¹,

Qiu²,

Zhang³

et al. 2003

Journal of Adhesion Science and Technology

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In order to investigate the effect of atmospheric pressure plasmas on adhesion between aramid bers and epoxy, aramid bers were treated with atmospheric pressure helium/ air for 15, 30 and 60 s on a capacitively-coupleddevice at a frequency of 5.0 kHz and He outlet pressure of 3.43 kPa. SEM analysis at 10 000£ magni cation showed no signi cant surface morphological change resulted from the plasma treatments. XPS analysis showed a decrease in carbon content and an increase in oxygen content. Deconvolution analysis of C1s, N1s and O1s peaks showed an increase in surface hydroxyl groups that can interact with epoxy resin. The microbond test showed that the plasma treatment for 60 s increased interfacial shear strength by 109% over that of the control (untreated). The atmospheric pressure plasma increased single ber tensile strength by 16-26%.

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Section: Single Ber Tensile Strengthmentioning

confidence: 98%

Effects of atmospheric pressure helium/air plasma treatment on adhesion and mechanical properties of aramid fibers

Hwang¹,

Qiu²,

Zhang³

et al. 2003

Journal of Adhesion Science and Technology

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“…In this context, and due to the interesting of these fibres for military and civil applications, several studies can be found to improve the impact strength of the systems where they are involved. The low surface energy and chemically inert surface motivated several works to improve their interfacial adhesion with the matrices, but other techniques like stitching, multiaxial warp‐knit fabrics, by fibre hybridisation or the resource to nano‐enhanced resins can be found in the literature.…”

Section: Introductionmentioning

confidence: 99%

Strain rate effect on composites with epoxy matrix filled by cork powder

Silva

Santos

Sousa

et al. 2019

Mat Design Process Comm

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Literature is consensual that composite materials are sensitive to the strain rate and, consequently, the design of a structure is too conservative when the static properties are only taken into account. For this purpose, three point bending static tests were performed with different strain rates at room temperature. In terms of materials, Kevlar and carbon composites with pure epoxy matrix and filled by cork powder were studied. It was possible to conclude that, for all materials, the bending stress and strain at maximum bending stress are loading rate sensitive. However, in terms of bending modulus, carbon composites with pure resin show to be insensitive to the strain‐rate. Finally, the tendency observed for these properties can be supported by linear models, as suggested by the open literature.

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“…The adhesion achieved between aramid fibers and epoxy matrices were much lower than that obtained by other, inorganic reinforcing fibers. In their own study on the bonding mechanism between aramid fibers and epoxy matrices, Kalantar and Drzal [58] showed that epoxy resin shrinkage is not a primary cause of sometimes insufficient adhesion of aramid fibers to epoxy matrices and that the curing temperature does not influence the composite failure mechanism. The close match of aramid radial thermal expansion coefficient and its Poisson ratio to those of the matrix reportedly results in lower interfacial radial stresses for the aramid fiber-epoxy interface, as compared to carbon fiber-epoxy interface.…”

Section: Epoxy Resin Matricesmentioning

confidence: 98%

“…Moreover, the maximum values of ISS derived at different loading levels, can be used to characterize the interfacial properties of aramid/epoxy model composites. It is appropriate to mention here that ISS is proportional to the fiber tensile strength and diameter divided by the final fiber fragment length [58]. Based on the Raman response of aramid fibers, a multifunctional non-destructive test was proposed for Kevlar/epoxy laminates [60].…”

Section: Epoxy Resin Matricesmentioning

confidence: 99%