Figure 22 (a) 3D model of keyring and (b) 3D printed keyring (64.0 mm ×
30.0 mm × 3.6 mm) using 15-DAAQ/TEAOH/R-Br (0.5%/2%/2%, wt %) as
PISs.[35]
In addition to this, Xiao et al.[90] also
investigated the application of indigo carmine (IDGCM) as a
photosensitizer with for 3D printing of photopolymerization. IDGCM
possesses excellent good water solubility, visible light sensitivity and
biocompatibility, hence it can give the corresponding properties of
photopolymerization and 3D printing. The chemical structures of IDGCM,
additive, and monomer/oligomers used in corresponding experiments are
shown in Figure 23. The indigo carmine-based photoinitiating system
induced a rapid photochemical reaction and photobleaching under blue and
green LEDs with low light intensity. The photopolymerization system
composed of IDGCM/Iod (0.5 %/2 %, wt) and PEGDA 700/deionized water
(80 %/20 %, wt) in the presence of 25 mM NaOH can achieve rapid and
high-fidelity 3D printing, as shown in Figure 24.
Figure 23 Chemical structures of IDGCM, additive, and
monomer/oligomers.[90]