Mechanical Properties of Fibers Coated by Atomic Layer Deposition for Polymer-Matrix Composites with Enhanced Thermal and Ultraviolet Resistance

Rodríguez, Robin E.; Cho, Tae H.; Ravandi, Mohammad Reza Ghotbi; LePage, William S.; Banu, Mihaela; Thouless, M.D.; Dasgupta, Neil P.

doi:10.1007/978-3-030-36296-6_140

Cited by 1 publication

(2 citation statements)

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“…This broad materials selection allows for the design of materials with specified properties, representing a powerful method for incorporating multifunctionality into composites . Previous contributions have demonstrated that ALD can conformally coat fibers − and that they can be made to be conductive. − Furthermore, the effects interconnected fibers in woven and nonwoven fabrics have on their conductive properties have been studied . Normal compressive forces on woven and nonwoven fabrics have been shown to improve through-fabric conductance as a result of enhanced fiber–fiber contact, which minimizes contact resistance within the fiber structure .…”

Section: Introductionmentioning

confidence: 99%

“…Normal compressive forces on woven and nonwoven fabrics have been shown to improve through-fabric conductance as a result of enhanced fiber–fiber contact, which minimizes contact resistance within the fiber structure . ALD coating of fibers has shown promise for engineering the mechanical response of polymer interfaces and PMCs. ,, However, the use of ALD to impart electrical conductivity into PMCs has not been previously studied, which represents an important step toward multifunctional composites by design. Moreover, there is a need to quantify the coupled mechanical and electrical behavior of these multifunctional PMCs under applied loads in order to identify the design constraints and criteria for co-optimization of their functional and structural properties.…”

Section: Introductionmentioning

confidence: 99%

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Electrically Conductive Kevlar Fibers and Polymer-Matrix Composites Enabled by Atomic Layer Deposition

Rodríguez

Lee

Chen

et al. 2021

ACS Appl. Polym. Mater.

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Multifunctional composites that incorporate nonstructural capabilities such as energy storage, self-healing, and structural health monitoring have the potential to transform load-bearing components in automotive and aerospace vehicles. Imparting electrical conductivity into polymer-matrix composites (PMCs) is an important step in enabling multifunctionality while maintaining mechanical stiffness and strength. In this work, electrically conductive PMCs were fabricated by conformally coating Kevlar 49 woven fabrics with aluminum-doped zinc oxide using atomic layer deposition (ALD). Electrical resistance was measured at the single-fiber, single-tow, and woven fabric levels as a function of coating thickness. The ALD coatings on adjacent fibers merge as their thickness increases, resulting in an interconnected network with improved percolation and lower resistance. After ALD, the fabrics were embedded in an epoxy matrix to manufacture PMCs. The electrical resistance of the composites increased with applied tensile strain, which was attributed to cracking of the conductive coatings. The relative change in resistance as a function of strain varied with coating thickness, which was rationalized by a thin-film fracture mechanics model. This work demonstrates a pathway for scalable and tunable incorporation of electrical conductivity into fiber-reinforced composites without significantly changing their density or load-bearing capabilities.

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