Akademik Veri Yönetim Sistemi
8th International Conference on Self Healing Materials – ICSHM 2022, Milan, İtalya, 20 - 22 Haziran 2022, ss.1
Materials
with recycling and self-healing properties have gained growing attention in
recent years due to their potential to
improve the damage tolerance and
sustainability aspects of materials and components made thereof. However,
producing materials with both high self- healing efficiency and recyclability
is still a challenge. In this study we
will show the potential use of metal-coordination to develop healable and recyclable
PDMS elastomers with overall good mechanical behavior. To this aim, healable
and recyclable PDMS elastomers were
prepared from aminopropyl terminated PDMS and 2, 5-thiophene dicarboxaldehyde
via Schiff base formation. Iron and zinc ionic salts were used to induce
reversible physical crosslinking through metal-ligand complexation with the
PDMS. Bond energies of the metal- ligand complexes were calculated through density
functional theory (DFT) at the B3LYP/6-311G(d,p) level.
Bond energies were used for
investigate the effect
of coordination bond energy and bond dynamics on the mechanical properties,
recyclability and self-healing efficiency of PDMS elastomers. Mechanical
properties of the elastomers short after synthesis, after
healing of cut-through damages
and after polymer
reprocessing were determined
using universal testing machine with dog bone shaped samples. It was found
that, unlike for iron-thiophene complexes,
zinc-thiophene metal-ligand
complexation provides fast healing
ability (up to 96%) and high degrees of recyclability. The relationship between
the bond energy and the healing and recycling abilities will be discussed.