Title: A Preliminary Investigation of Moisture Effect on the Nanofiber Z-Threaded CFRP Prepreg and Laminate

Authors: Md N. Uddin, William W. Taylor, Mohammad R. Islam, Kuang-Ting Hsiao

DOI: 10.33599/nasampe/s.22.0751

Abstract: Moisture is a known issue for carbon fiber reinforced polymer (CFRP) manufacturing. During the process, in which a CFRP prepreg is carefully thawed, cut, stacked, and cured into a laminate, any bad moisture control can cause voids, affect the curing, and degrade the laminate. Recent studies of carbon nanofiber z-threaded CFRP (i.e., ZT-CFRP) prepreg and its laminates showed significant multifunctional improvements in the mechanical strengths, toughness, thermal conductivity, and electrical conductivity. The carbon nanofibers zig-zag thread among the carbon fibers in the through-thickness direction (i.e., z-direction) and mechanically interlock the fiber system together to form an effective 3D-fiber-network reinforced laminate. This paper presents a preliminary experimental study on the ZT-CFRP prepreg when facing the moisture exposure during the prepreg handling and lamination process. Both the ZT-CFRP and traditional CFRP prepregs, subjected to different humidity conditions, will be cut, and cured into laminate samples. The samples will be tested for their interlaminar shear strengths (ILSS) and hardness. Microscope pictures of the samples' fracture patterns will be compared for explaining the combined impact of the moistures and the carbon nanofiber z-threading strategy on the laminates' interlaminar shear strength and curing state.

References: 1. P.K. Mallick, Fiber-Reinforced Composites. 3rd ed. Boca Raton, 2007. https://doi.org/10.1201/9781420005981 2. N. Sharp, C. Li, A. Strachan, D. Adams, R.B. Pipes, Effects of water on epoxy cure kinetics and glass transition temperature utilizing molecular dynamics simulations. 1st ed. Wiley Periodicals, Inc, 2017. https://doi.org/10.1002/polb.24357 3. P. Nogueira,C. Ramírez,A. Torres,M. J. Abad,J. Cano,J. López,I. López-Bueno,L. Barral, Effects of water sorption on the structure and mechanical properties of an epoxy resin system. Vol. 80, John Wiley & Sons, Inc. 2001 4. M. Lettieri, M. Frigione, Effects of humidity environment on thermal and mechanical properties of a cold-curing structural epoxy adhesive. Vol. 30. 2012. https://doi.org/10.1016/j.conbuildmat.2011.12.077 5. K.-T. Hsiao, A.M. Scruggs, J.S. Brewer Jr, G.J.S. Hickman, E.E. McDonald, K. Henderson, “Effect of carbon nanofiber z-threads on mode-I delamination toughness of carbon fiber reinforced plastic laminates.” Composites Part A: Applied Science and Manufacturing, Volume 91, December 2016, 324–335. http://dx.doi.org/10.1016/j.compositesa.2016.10.022 6. S. Kirmse, B. Ranabhat, K-T Hsiao, Experimental and analytical investigation on the interlaminar shear strength of carbon fiber composites reinforced with carbon nanofiber z-threads, Materials Today Communications, Volume 25, December 2020, 101512. 7. B. Ranabhat, K.-T. Hsiao, “Improve the through-thickness electrical conductivity of CFRP laminate using flow-aligned carbon nanofiber z-threads.” Proceedings of SAMPE 2018, Long Beach, CA, May 21-24, 2018. 8. M. Scruggs, S. Kirmse, and K.-T. Hsiao, “Enhancement of Through-Thickness Thermal Transport in Unidirectional Carbon Fiber Reinforced Plastic Laminates due to the Synergetic Role of Carbon Nanofiber Z-Threads.” Journal of Nanomaterials, Volume 2019, Article ID 8928917, https://doi.org/10.1155/2019/8928917 9. T. Ozkan, M. Naraghi, I. Chasiotis, Mechanical properties of vapor grown carbon nanofibers, Carbon 48 (2009) 239–244 10. Kuang-Ting Hsiao and Gregory Hickman, “Method for manufacturing nano-structurally aligned multi-scale composites”, US10066065B2, 2020-6-24 https://patents.google.com/patent/US10066065B2

Conference: SAMPE 2022

Publication Date: 2022/05/23

SKU: TP22-0000000751

Pages: 15

Price: $30.00