Excimer formation and microscopic and macroscopic viscosity of the solvent

Architecture with photopolymerization

“…From the result presented above we conclude that the fluorescence ratio is not a measure of the solution viscosity but of the microviscosity around the fluorescent probe. The differences between these two viscosities are well known (41)(42)(43)(44). In particular, the microviscosity changes linearly with concentration up to 20 to 30% polymer and, beyond a certain degree of polymerization (approximately 60 for polyethylene), is independent of polymer molecular weight.…”

Pyrene as a fluorescent probe for monitoring polymerization rates

“…The differences between these two viscosities are wellknown. [32][33][34][35] In particular, the microviscosity changes linearly with concentration up to 20-30% polymer and, beyond a certain degree of polymerization (approximately 60 for polyethylene), is independent of polymer molecular weight.…”