Terminal Group Analyses of Photopolymerized Products Using a MALDI-TOFMS for the Study on the Oxime Ester type Photoinitiators

Terminal group analyses of photochemically initiated polymers were conducted using a matrix-assisted laser desorption / ionization time of flight mass spectrometry (MALDI-TOFMS) in combination with a preparative SEC, a real time FTIR and a gray scale photospeed method. The analysis enabled the assignment of the terminal groups of resulting oligomers from an acrylate monomer and oximate type photoinitiator. Identified built-in terminal groups revealed solvent chain-transfer and difference in photoinitiation due to the chemical structure of oximate.