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“Mono” and “bifunctional” aromatic esterificated benzophenone photoinitiators for free radical polymerization

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Abstract

Aromatic esterificated benzophenone derivatives, benzoic acid 4-benzoyl-phenyl ester (BPBz) and bis-benzoic acid 4-benzoyl-phenyl ester (BisBPBz) were simply synthesized and characterized. The triplet states of the photoinitiators were determined by laser flash photolysis and phosphorescence spectroscopy. The photodecomposition of the initiators was performed by UV light; the increase in the absorption spectra was attributed to the decreasing number of ester groups which led to an increase in ketone groups according to the Photo-Fries rearrangement of aromatic esters. The photoinitiation capabilities for methyl methacrylate (MMA) polymerizations were investigated under air and nitrogen atmospheres. Ester-functional benzophenone photoinitiators were found to be more effective than benzophenone (BP) in the presence of a co-initiator for photoinduced free radical polymerization of MMA. The kinetics of photopolymerization for different formulations which consist of multifunctional acrylates was also studied using the Real-Time Fourier Transform infrared spectroscopy (RT-FTIR) method. The film properties of these formulations were investigated after curing of films by Mini-UV-Cure equipment.

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Acknowledgments

The authors would like to thank the Yildiz Technical University Research Foundation (24-01-02-08), TUBITAK and DPT for their financial support.

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Authors and Affiliations

  1. Department of Chemistry, Yildiz Technical University, 34210, Istanbul, Turkey

    Meral Aydin, Demet Karaca Balta & Nergis Arsu

  2. Polymer Engineering Department, Faculty of Engineering, Yalova University, Yalova, Turkey

    Gokhan Temel

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  1. Meral Aydin
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  2. Gokhan Temel
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  3. Demet Karaca Balta
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  4. Nergis Arsu
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Correspondence to Meral Aydin or Gokhan Temel.

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Aydin, M., Temel, G., Balta, D.K. et al. “Mono” and “bifunctional” aromatic esterificated benzophenone photoinitiators for free radical polymerization. Polym. Bull. 72, 309–322 (2015). https://doi.org/10.1007/s00289-014-1274-3

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  • DOI: https://doi.org/10.1007/s00289-014-1274-3

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