Two new biocompatible polymers were designed, which can be 3D structured via multiphoton lithography. Their mechanical properties and biocompatibility were determined.
Stretchable
conductive films were obtained by screen printing and
thermal treatment of a homogenous ink comprising a thermally reducible
silver formate complex, an acrylate monomer, and a radical initiator.
In the curing process, both the filler nanoparticles and the polymer
matrix are generated in situ, at temperatures as low as 100 °C.
The obtained conductors, consisting of percolated silver nanoparticles
embedded in a polymeric matrix, typically show a resistivity of (2–4)
× 10–5 Ω·m. When applied on an elastomeric
substrate, the composite is stretchable up to 200% with very low R/R
0 values, which is unprecedented
for stretchable silver composite inks. Quasi-in situ confocal laser
scanning microscopy of the strained samples revealed an initial fracture
strain above 40%, which is unusually high for metal–nanoparticle
films. The described system was compared to some commercial stretchable
screen-printing inks and proved superior with regard to both R/R
0 and resistance to cyclic
tensile loading.
Herein, we demonstrated the synthesis of multifunctional alkyne building blocks from commercially available acrylate monomers exploiting the carbon and oxa Michael addition reaction. These compounds were obtained in decent yields and show similar or even higher photoreactivity than the initial acrylates. Importantly, selected thiol‐yne formulations can be processed by stereolithography and significantly outperform the corresponding acrylate in terms of modulus and toughness. The high compatibility of such cured materials with osteosarcoma cells makes these photopolymers interesting for hard tissue engineering.
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