Photo-polymerization properties of type-II photoinitiator systems based on 2-chlorohexaaryl biimidazole (o-Cl-HABI) and various N-phenylglycine (NPG) derivatives.

Photochem Photobiol Sci

Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, 415 jiangong Rd., Sanmin District, Kaohsiung City 80778, Taiwan, Republic of China.

Published: January 2019

AI Article Synopsis

  • A series of p-substituted NPG derivatives, including Cl-NPG, OMe-NPG, and NO-NPG, were created and analyzed for their thermal stability and optical properties.
  • These modified NPG compounds exhibited red shifted absorption compared to the original NPG, making them suitable for further experimentation.
  • The effectiveness of these NPG derivatives combined with 2-chlorohexaaryl biimidazole for Type II free radical polymerization was evaluated through gel fraction analysis and cyclic voltammetry to measure electron transfer efficiency.

Article Abstract

A series of p-substituted NPG derivatives (Cl-NPG, OMe-NPG and NO-NPG) comprising different push-pull characteristics have been synthesized and characterized. The NPG derivatives have good thermal stability and red shifted absorption when compared with the original N-phenyl glycine (NPG) compound. These NPGs were selected in combination with 2-chlorohexaaryl biimidazole (o-Cl-HABI) for Type II free radical polymerization (FRP). Commercial NPG was also mixed with o-Cl-HABI for comparison. Their photo-polymerization properties were investigated by the gel fraction method in a nitrogen atmosphere. Electron transfer efficiencies for those Type II packages were studied by cyclic voltammetry (CV) and free energy change ΔG results.

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http://dx.doi.org/10.1039/c8pp00300aDOI Listing

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