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