Real-time monitoring of polymer viscosity in confined environments is challenging; this study uses the luminescent complex [Cu(diptmp)2] as an optical probe to measure viscosity changes during adhesive curing.
The emission lifetime of [Cu(diptmp)] increased exponentially with viscosity, correlating with traditional rheological methods, while changes were also observed during polymer swelling and unswelling.
Compared to a control [Ru(bpy)], [Cu(diptmp)] demonstrated a greater emission lifetime and effectiveness as a real-time viscosity sensor, even in opaque adhesive samples.