Akademik Veri Yönetim Sistemi
POLYMER BULLETIN, cilt.83, sa.8, ss.1-29, 2024 (SCI-Expanded, Scopus)
In this study, ureidopyrimidinone moieties (UPy), capable of physical crosslinking
via quadruple hydrogen bonding, were successfully incorporated into UV-curable
polyurethane acrylate prepolymers. First, a hydroxyl-terminated unsaturated ester
monomer was synthesized and reacted with isophorone diisocyanate to create a
hydroxyl-terminated UV-curable urethane oligomer (U–OH). Then, isocyanate-terminated building blocks (UPy moieties and an acrylate-based photosensitive monomer) were synthesized and used in various ratios to functionalize U–OH for the
preparation of a series of UV-curable UPy-containing polyurethane acrylate (PUA)
resins. The resulting products were structurally characterized using 1H NMR and
FTIR spectroscopy. Furthermore, organic–inorganic hybrid nanocomposites were
obtained by introducing silane coupling agents into PUA resins using the sol–gel
process. A series of UV-curable UPy-containing PUA coatings and hybrid nanocomposites were prepared, and their synergistic effect on coating properties was
investigated. The dynamic mechanical analysis revealed that the Tg of the samples
increased with increasing UPy content, although the mechanical properties remained
largely unaltered, as shown by the stress–strain test. The studies also demonstrated
that the hybrid nanocomposites exhibited higher decomposition temperatures and
better thermal stability compared to pure PUAs. All the coatings exhibited good
transparency in the visible region. An optical microscope was used to investigate the
self-healing property by scratching the plexiglass panels with a razor blade. Among
the other samples, the coating with the highest percentage of UPy content exhibited
the best self-healing ability after heat treatment at 90 °C for 10 min.