Highly Durable, Conductive Polyurethane/Graphene/Lignin
Nanocomposite Coatings Produced via an Aqueous-Only
Route for Corrosion Preventive or Antistatic Coating
Applications
Presenting Author
Seyed Ismail Seyed Shahabadi*a
Co-Authors
Junhua Kongb, Xuehong Lua
a
School of Materials Science and Engineering,
Nanyang Technological University, 50 Nanyang
Avenue, Singapore 639798, Singapore
b
Institute of Materials Research and Engineering, Astar, 2 Fusionopolis Way, Singapore 138634,
Singapore
*[email protected]
Abstract
From pristine graphite, lignin-modified
graphene (LMG) was produced [1] and
added to waterborne polyurethane (WPU)
to prepare nanocomposites through an
aqueous-only
route.
WPU/LMG
nanocomposite coatings show complete
self-healing after only 150s of IR irradiation
because of entropic and enthalpic
contributions of LMG nanoheaters to selfhealing [2]. Moreover, it is revealed for the
first time that although nanocomposite
coatings display a two-dimensional healing
behaviour, at each phase the healing
progresses uniaxially, for which we have
proposed a mechanism (Figure 1).
Furthermore, WPU/LMG nanocomposites
exhibit substantial improvement in UV
stability compared to WPU/lignin (with
4.5wt% lignin), which was studied to deconvolute the effect of lignin from
graphene, and unloaded WPU (Figure 2).
This improvement in maintaining structural
integrity is because of LMG’s preventive
antioxidant activities such as UV absorption
and gas impermeability, its radical
scavenging properties, as well as possible
synergistic interactions between lignin and
graphene [3,4]. Our self-healable, UVresistant, conductive WPU/LMG coating is a
Graphene2017
highly durable candidate for corrosion
preventive
or
antistatic
coating
applications.
References
[1] Liu W. et al., Carbon, 2015.83:188-197.
[2] Richardson HH. et al., Nano letters
2009.9(3):1139-1146.
[3] Yang J. et al., Journal of Materials
Chemistry A, 2013.1(37): 11184-11191.
[4] Wang G. et al., Analytica chimica
acta, 2013.802:103-112.
Figures
Figure 1: Uniaxial, 2D self-healing of WPU/LMG
driven by viscoelastic recovery response, surfacetension-driven
viscoelastic
restoration,
and
polymer diffusion. Healing is composed of two
distinct phases.
Figure 2: Ratios of elastic moduli after UV
irradiation to their corresponding values before
irradiation for WPU/LMG nanocomposites with
varying LMG contents, WPU/lignin, and unloaded
WPU. The rate of the fall is substantially reduced for
nanocomposites, while unloaded WPU loses its
structural integrity after only three days. Inset
compares retention ratios after 7 days.
March 28-31, 2017 Barcelona (Spain)