抄録
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 two-component photoinitiator systems, bisimidazole and hydrogen donor. Hydrogen donor origin species were identified as built-in terminal groups in the oligomers for the two bisimidazole/hydrogen donor systems, 2,2'-bis (o-chlorophenyl)-4,4',5,5'-tetraphenyl- imidazole (o-ClHABI) and 2-mercaptobenzoxazole (MBO), and o-ClHABI and N-phenyl glycine (NPG), the two bisimidazole/hydrogen donor systems. From o-ClHABI/NPG photoinitiator system, two types of built-in terminal groups with and without decarboxylation of NPG system were identified. Only for o-ClHABI/MBO, a double-capped oligomer was identified, while a single-capped oligomer was identified for o-ClHABI/NPG. Terminating paths were also discussed.