Palm oil based alkyd/polyaniline as electrically conductive coating with UV curing ability / Siti Nur Amalina Ramlan
Environmentally friendly products are gaining popularity recently, in line with the increasing global demand for green technology. Ultraviolet (UV)-curable coating is one of them since it involves minimal, if any, emission of volatile organic compounds during the curing process. Besides, UV curin...
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Format: | Thesis |
Published: |
2018
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Online Access: | http://studentsrepo.um.edu.my/9366/1/Siti_Nur_Amalina_Ramlan.pdf http://studentsrepo.um.edu.my/9366/6/amalina.pdf http://studentsrepo.um.edu.my/9366/ |
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Summary: | Environmentally friendly products are gaining popularity recently, in line with the
increasing global demand for green technology. Ultraviolet (UV)-curable coating is one
of them since it involves minimal, if any, emission of volatile organic compounds
during the curing process. Besides, UV curing technology enables coatings to be cured
within much shorter time compared to thermal curing process. The aim of this study is
to produce electrically conductive UV-curable coating which is environmentally
friendly. Polyaniline is a polymer with excellent electrical conductivity and it is known
to exhibit anti-corrosion properties through passivation. However, polyaniline itself is
not a good coating binder, as it tends to produce brittle film with poor adhesion.
Therefore, in this work palm oil-based polyester binder was synthesized and blended
with polyaniline to produce electrically active coating with improved film properties.
The alkyd resin was formulated with considerable amount of maleic acid formulation in
order to render it UV-curable. Both alkyd and polyaniline was characterized using
FTIR, 1H-NMR, TGA and UV-Vis. Some of the tests carried out to investigate the film
properties of the coatings include pencil hardness test, adhesion tape test, water and
chemical resistant test, conductivity, and thermal stability. Alkyd has improved poor
coating binder properties of polyaniline in term of their mechanical properties. In
addition, anticorrosion property of the coatings on mild steels were determined using
open circuit potential (OCP) values, Tafel analysis and electrochemical impedance
spectroscopy (EIS). Alkyd coating which contains 0.5% polyaniline shows improved
corrosion resistance properties with corrosion rate 2.277 x 10-5 mm/y. A stable and
homogeneous alkyd/polyaniline coating film has been prepared in this project with evidences from the FTIR analyses and conductivity studies showing strong interaction
between alkyd and polyaniline through crosslinking reaction. |
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