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Properties of 3D Printed Continuous Fiber-Reinforced CNTs and Graphene Filled Nylon 6 Nanocomposites

Liu, Zhihui
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1512045511745974

Abstract Details

2017, MS, University of Cincinnati, Engineering and Applied Science: Materials Science.
Nanomaterials have attracted much attention due to the excellent properties they possess and their promising applications. The combination of 3D printing and composite materials has redefined the mechanical properties of 3D printed products. In this research, nylon (PA) 6 nanocomposites filled with either carbon nanotubes(CNTs), graphene or graphene-NH2 were 3D printed together with Kevlar fibers into specimens for mechanical tests and other characterizations. Different weight percentages of CNTs and graphene were used to produce the nanocomposites, in order to figure the properties of each nanoparticle reinforced PA 6. The melt mixed CNTs or graphene nanocomposites were extruded into filaments and used in the 3D printer. A Markforged printer allowed the production of continuous Kevlar fiber reinforced nanocomposites. The tensile and flexural tests revealed that the best weight percentage of CNTs is 0.5wt%, where the entanglements and agglomerates of CNTs were not so obvious. Surprisingly, the CNTs filled PA 6 nanocomposites did not show as significant improvements in mechanical properties as graphene filled PA 6, due to the weak interfacial interactions between the CNTs and the PA 6 matrix. The addition of Kevlar fibers increased the tensile strength and flexural modulus of PA 6 by 526% and 1388%. Also, the tensile fatigue results showed that 1%CNT/PA 6+Kevlar specimens have the longest fatigue life among the materials tested. Graphene filled PA 6 presented much better improvements in mechanical properties. With only 0.1wt% of graphene, the tensile modulus improved by 101% and with 1wt% of graphene the modulus improved by 153%. Additionally, although Kevlar fibers dominate the main mechanical properties of these composite materials, the existence of graphene also contributes to the enhancement of strengths and moduli, unlike CNTs. Strong interfacial bonding allows efficient load transfer between matrix and reinforcement. Therefore, graphene-NH2/PA 6 showed significant improvements in both tensile and bending strengths. The tensile modulus of 0.1% graphene-NH2/PA 6 and 1% graphene-NH2/PA 6 are increased by 212% and 253%. Flexural tests showed obvious difference between different nanoparticle fillers. However, the anisotropic specimens did not show much difference between different weight percentages of the same kind of nanocomposite. It is found that the well-dispersion of nanoparticles in the matrix and strong interfacial bonding between the filler and the matrix are the main reasons for the enhancement of mechanical properties of nanocomposites. The addition of Kevlar fibers improved the stiffness and strength of the composites significantly.
Jing Shi, Ph.D. (Committee Chair)
Gregory Beaucage, Ph.D. (Committee Member)
Jude Iroh, Ph.D. (Committee Member)
102 p.
Materials Science
3D printing; Nanocomposite; CNTs; graohene; Kevlar; Nylon 6

Recommended Citations

Citations

  • Liu, Z. (2017). Properties of 3D Printed Continuous Fiber-Reinforced CNTs and Graphene Filled Nylon 6 Nanocomposites [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1512045511745974

    APA Style (7th edition)

  • Liu, Zhihui. Properties of 3D Printed Continuous Fiber-Reinforced CNTs and Graphene Filled Nylon 6 Nanocomposites. 2017. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1512045511745974.

    MLA Style (8th edition)

  • Liu, Zhihui. "Properties of 3D Printed Continuous Fiber-Reinforced CNTs and Graphene Filled Nylon 6 Nanocomposites." Master's thesis, University of Cincinnati, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1512045511745974

    Chicago Manual of Style (17th edition)

ucin1512045511745974
630
© 2017, some rights reserved.Creative Commons License Properties of 3D Printed Continuous Fiber-Reinforced CNTs and Graphene Filled Nylon 6 Nanocomposites by Zhihui Liu is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Cincinnati and OhioLINK.