Third Day Poster Session, 17 June 2010 - NanoTR-VI

Poster Session, Thursday, June 17
Theme F686 - N1123
The Maleimide Modified Epoxy Resins for the Preparation of UV-Curable Hybrid Coatings
Zerrin Altınta *, Sevim Karata¸ Nilhan Kayaman-Apohan and Atilla Güngör
Marmara University, Department of Chemistry 34722 Istanbul/Turkey
Abstract: In the present study, maleimide-modified epoxide resin containing UV-curable hybrid coating materials were prepared and coated
on polycarbonate substrates in order to improve their surface properties. The coating formulations with different compositions were prepared
from UV-curable bismaleimide-based epoxy oligomer and sol–gel mixture. The thermal and morphological properties of these coatings
materials were investigated by using TGA and SEM techniques. The thermal characteristics of UV curable hybrid films were found to be
better than without Bismaleimide and sol-gel precursor.
Polymers of N-substituted maleimides and their
derivatives having a rigid imide ring in the backbone are
known as high performance polymers. Among them,
bismaleimides (BMIs) have attracted much attention
because of their high-temperature resistance, high glasstransition
temperature, excellent chemical and corrosion
resistance, and low cost. Bismaleimide resins are an
addition-type polyimide class of macromolecular
compounds produced from bismaleimide monomers and
contain unsaturated end groups. Bismaleimides capped
prepolymers are cured into a highly cross-linked network
by additional reactions without the evolution of volatile
by-products. However, due to their high cross-link density,
they are often brittle, resulting in low impact and fracture
toughness. Introduction of a long, flexible epoxy chain into
the backbone of bismaleimides is expected to reduce crosslink
density and also to improve fracture toughness by
dissipating the impact energy along the entire molecular
chain [1].
Currently, to meet the demand of highly miniaturized
electronic devices, non-linear optical applications, and the
development of next generation spacecrafts, further
improvement in the high performance polymers is needed.
Organic–inorganic hybrid coatings offer the opportunity to
combine the desirable properties of organic polymers
(elasticity, processability) and inorganic solids (hardness,
chemical inertness, and thermal resistance). Close to the
excellent properties of the obtained coatings,
photopolymerization process itself affords advantages such
as very high reaction rates at room temperature and spatial
control of polymerization. These materials manifest some
advantages such as low optical propagation loss, high
chemical, and mechanical stabilities as well as good
compatibility with different surfaces to be coated [2-3].
Hence, in this work, a novel bismaleimide was
synthesized by the reaction of cycloaliphatic diepoxide
with N-(carboxyphenyl) maleimide. Afterwards, the
hybrid coatings based on UV-curable bismaleimide capped
cycloaliphatic epoxy oligomer were prepared by sol–gel
method to investigate the coating properties. The hybrid
materials were characterized by analysis of hardness,
gloss, adhesion, and stress–strain. The thermal and
morphological behaviors of the coating were also
evaluated.
Table 1. TGA analysis of coating networks
Samples
60CF
25CF-35BMI
25CF-35BMI-5Si
25CF-35BMI-10Si
25CF-35BMI-15Si
First
weight
loss
( O C)
355
360
355
360
355
Max.
weight
loss
( O C)
445
445
445
445
445
Final
weight
loss
( O C)
595
625
630
635
645
In conclusion, a series of UV-curable organic-inorganic
hybrid coatings were prepared based on sol–gel reactions
for TEOS and MAPTMS in the presence of epoxy
modified Bismaleimide oligomer (BMI) and urethane
acrylate oligomer (UA). Incorporation of bismaleimide
modified epoxy resin into the organic part strongly
increased the thermal resistance of hybrid samples. Upon
increasing the inorganic content of the coating material,
thermal, mechanical, and other properties, such as
hardness, gloss, contact angle, and abrasion resistance,
were also improved. Corona-treated polycarbonate test
panels facilitated the adhesion of the coating materials. All
hybrid coatings were obtained crack-free and transparent.
Furthermore, the increase in the contact angle data of the
hybrid coatings demonstrated the formation of
hydrophobic surface.
*Corresponding author: altintas_zerrin@hotmail.com
[1] F. Yılmaz, L. Cianga, Y. Gu¨ ner, L. Toppare, Y. Yacı,
Polymer, 45, 5765, (2004).
[2] H. Tang, W. Li, X. Fan, X. Chen, Z. shen, O. Zhou, Polymer,
50,1414 (2009).
[3] L. A. White, J. W. Weber, L. J. Mathias, Polym. Bulletin , 46,
339, (2001).
6th Nanoscience and Nanotechnology Conference, zmir, 2010 708