Production and characterization of nano composite laminates based on PC and reduced graphene oxide by marangoni technique

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Date

2024

Authors

Naderi, Hossein

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Abstract

Due to its remarkable mechanical, electrical, and thermal properties, graphene is an exceptional candidate for strengthening lightweight composite materials. Until now, the primary use of graphene has been in the form of discontinuous flakes such as Graphene Nanoplatelets (GNPs); however, the downside of these types of conventional composites is the inefficient stress transfer between the graphene filler and the matrix which results in lower mechanical properties than as expected. In this master’s thesis, another approach to composite production is proposed by the cooperation of self-assembled GNPs in polymer thin films. Applying Self-assembled GNPs in a fish scale morphological continuous arrangement in this method allows bridging of discontinuous flakes offering them higher conductivity, mechanical strength, and ease of integration compared to randomly dispersed GNP nanoparticles, making them ideal for various applications requiring superior performance and durability. The new method is described as the production of self-assembled GNPs/polymer nanolaminates based on rGO ultra-thin film produced through the Marangoni technique and ultra-film polymer films which are considered as the nanolaminate building blocks. By fabricating thin polymer films, it is possible to have nanolaminates with different graphene volume fractions having outstanding mechanical, electrical, and thermal properties compared with the GNP composites and other functionalities such as the Joule heating effect which surpasses the conventional graphene composites. Marangoni rGO/PC nanolaminates were fabricated with the number of layers of 2 to 11 and graphene volume fraction ranging from zero to 2.5%. The results from uniaxial tensile tests have illustrated the considerable enhancement in both Young’s modulus (with an effective modulus 31.0 GPa) and strength increasing rate (up to 9.24 MPa/%), demonstrating a successful reinforcement achieved through incorporating graphene into this nanolaminate structure with multiple layers. In addition, the Marangoni rGO/PC nanolaminates exhibited excellent electrical thermal conductivity compared to randomly dispersed composites. It has been observed that the inplane electrical conductivity of the material rises as graphene content increases. Specifically, having a 2.5% graphene volume fraction, the conductivity reaches up to 19.08 S/m. Furthermore, the nanolaminate shows great functionality regarding the Joule effect; an outstanding thermal power coefficient has been observed for this material.

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Keywords

Marangoni, Nanocomposites, Nanolaminate, Graphene, Polycarbonate

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