Issue 5, 2011
From the journal:

Polymer Chemistry

Long wavelength photoinitiated free radical polymerization using conjugated thiophene derivatives in the presence of onium salts

Selim Beyazit,a   Binnur Aydogan,a   Ipek Osken,a   Turan Ozturka  and  Yusuf Yagci*a  

* Corresponding authors

a Istanbul Technical University, Department of Chemistry, Maslak, Istanbul, Turkey
E-mail: yusuf@itu.edu.tr
Fax: +90-212-2856386
Tel: +90-212-2853241

Abstract

Long wavelength free radical photopolymerization of (meth)acrylic monomers using a conjugated thiophene derivative, namely 3,5-diphenyldithieno[3,2-b:2′,3′-d]-thiophene (DDT) and one of the following compounds, namely diphenyliodonium hexafluorophosphate (Ph2I+PF6−), triphenylsulfonium hexafluorophosphate (Ph3S+PF6−) and N-ethoxy-2-methylpyridinium hexafluorophosphate (EMP+PF6−), as photosensitizer and coinitiator, respectively, was described. Polymerization occurred only when DDT, in the presence of the onium salts, was irradiated at wavelengths where the salts have no absorption. A feasible initiation mechanism involves intermolecular electron transfer from photoexcited thiophene compound to the onium salt. The relative initiation efficiencies of the salts were investigated and evaluated in terms of their redox potentials.

Graphical abstract: Long wavelength photoinitiated free radical polymerization using conjugated thiophene derivatives in the presence of onium salts

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Article information

DOI
https://doi.org/10.1039/C1PY00019E
Article type
Paper
Submitted
14 Jan 2011
Accepted
09 Feb 2011
First published
01 Mar 2011

Polym. Chem., 2011,2, 1185-1189

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Long wavelength photoinitiated free radical polymerization using conjugated thiophene derivatives in the presence of onium salts

S. Beyazit, B. Aydogan, I. Osken, T. Ozturk and Y. Yagci, Polym. Chem., 2011, 2, 1185 DOI: 10.1039/C1PY00019E

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