Estimating the photodissociation quantum yield from PLP-SEC peak heights†
A fast method for the reliable estimation of the photodissociation quantum yield Φdiss is presented. Pulsed laser polymerization (PLP) experiments are performed at various pulse energies (1.5–6 mJ) and regression analysis is performed to the ratio of the peak heights identified in the size exclusion chromatography (SEC) trace. The high accuracy of the method is demonstrated for PLP initiated by 2,2-dimethoxy-2-phenylacetophenone (DMPA), considering in silico generated data including large theoretical errors (up to 20%). The method has also been successfully applied to experimental data of DMPA based isothermal PLP of n-butyl acrylate at 306 K, with an estimated Φdiss of 0.42 ± 0.04. In the long term, the method will facilitate the evaluation of current and the design of new highly efficient photoinitiators.