کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
176585 458948 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
N-substituted quinoxalinobenzothiazine/iodonium salt systems as visible photoinitiators for hybrid polymerization
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
N-substituted quinoxalinobenzothiazine/iodonium salt systems as visible photoinitiators for hybrid polymerization
چکیده انگلیسی

Sensitizers based on the 12-substituted 12H-quinoxalino-[2,3-b][1,4]-benzothiazine skeleton were synthesized and characterized using 1H NMR spectroscopy, mass spectrometry and elemental analysis. Their electrochemical and spectral properties, including absorption and emission spectra, fluorescence quantum yield and singlet lifetime were also measured. These benzothiazines combine with commercially available diphenyliodonium hexafluorophosphate to create novel visible initiator systems of free radical/cationic hybrid polymerization of glycidyl methacrylate. The efficiency of these initiator systems is discussed on the basis of the free energy change for electron transfer from the benzothiazines to the iodonium compound. During the photopolymerization photobleaching of the benzothiazines was observed; a mechanism to account for this bleaching is proposed.


► A two component initiator system for visible-light initiated hybrid polymerization is described.
► N-substituted benzothiazines are employed as oxidizable sensitizers.
► A diphenyliodonium salt as the co-initiator.
► A mechanism for the bleaching of benzothiazines was proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 97, Issue 3, June 2013, Pages 462–468
نویسندگان
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