Study on Fluorocarbon Chain Modified Acyl Phosphine Oxide as Long Wavelength Absorbing Photoinitiator

doi:10.7517/issn.1674-0475.180302

Abstract

Abstract: 2,4,6-Trimethylbenzoyl phosphonic acid perfluorooctyl ethyl ester (TPO-F), synthesized with ethyl 2,4,6-trimethylbenzoylphosphonate (TPO-L) and perfluorooctylethyl alcohol and oxalyl chloride.It was characterized by ¹HNMR, ¹⁹FNMR and FT-IR. The UV absorption spectra of TPO-F were similar to those of TPO-L, the molar absorbance of maximum wavelength is slightly higher. It was confirmed that TPO-F could rapidly immigrate to formulation surface with the UV absorption depth-resolution following of TPO-F solution. The photopolymerization kinetics of acrylate monomer with TPO-L, TPO-F as photoinitiator was investigated by (Photo-DSC). TPO-F exhibits moderate photoinitiation efficiency approximating to TPO-L under nitrogen atmosphere, but improved photoinitiation efficiency for TPOL-F and its combination with TPO-L was resulted under air due to the surface self-concentration effect of TPO-F. Oxygen inhibition effect popularly existing in radical photopolymerization may thus be limited.

Key words: photopolymerization, photoinitiator, migration, oxygen inhibition, UV-LED

XIE Gang, YANG Jianwen, ZHONG Rong. Study on Fluorocarbon Chain Modified Acyl Phosphine Oxide as Long Wavelength Absorbing Photoinitiator[J]. Imaging Science and Photochemistry, 2018, 36(5): 389-397.

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