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Home  > Raw materials & technologies  > Technologies  > Thioxanthone-functionalised 1,6-heptadiene...

Thursday, 27 June 2019
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Raw materials & technologies, Technologies

Thioxanthone-functionalised 1,6-heptadiene as monomeric photoinitiator

Friday, 31 May 2019

The synthesis of the first photoinitiator (PI) based on thioxanthone (TX) with 1,6-heptadiene structure has been described in a recent study.

The synthesis of the first photoinitiator (PI) based on thioxanthone (TX) with has been described (symbol image). Image source: Clker-Free-Vector-Images / Pixabay.
The synthesis of the first photoinitiator (PI) based on thioxanthone (TX) with has been described (symbol image). Image source: Clker-Free-Vector-I...

This PI (TXdMA) absorbs in the near UV–vis region (435–439 nm; with absorption redshift≈50 nm and ε values comparable to TX).

Photopolymerisation results demonstrate that although TXdMA is not an effective one-component polymerisable photoinitiator, it can successfully initiate photopolymerisation of poly(ethylene glycol) diacrylate (PEGDA, Mn = 250 D) and trimethylolpropane triacrylate (TMPTA) in the presence of bis-(4-tert-butylphenyl)-iodonium hexafluorophosphate (Iod) similar to TX/Iod.

Better migration stability than TX

TXdMA exhibits better migration stability than TX. Absorption, fluorescence, steady state photolysis and cyclic voltammetry experiments are carried out to investigate the photochemical mechanisms.

The study has been published in Progress in Organic Coatings, Volume 128, March 2019.

Image source: Pixabay.

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