Issue 40, 2021

Light induced crosslinking of main chain polybenzoxazines

Abstract

Photo-induced cationic ring opening reactions were performed on main chain polybenzoxazine precursors using iodonium salts. Gelation of the precursors was observed in a relatively short time upon photolysis at 300 nm. The obtained gels contained unreacted oxazines and subsequent thermal curing was applied successfully at relatively lower temperatures compared to typical benzoxazines. The main chain polybenzoxazine precursors are shown to have a dual curable character that could be beneficial for deep curing purposes. Moreover, the photocuring wavelength was extended to higher wavelengths using sensitizers such as thioxanthone and camphorquinone in the formulations. All the intermediates and final products were characterized by NMR, FTIR, and UV-Vis spectroscopies and differential scanning calorimetry (DSC) and thermo-gravimetric analysis (TGA) investigation.

Graphical abstract: Light induced crosslinking of main chain polybenzoxazines

Supplementary files

Article information

Article type
Paper
Submitted
10 ago 2021
Accepted
20 set 2021
First published
20 set 2021

Polym. Chem., 2021,12, 5781-5786

Light induced crosslinking of main chain polybenzoxazines

Z. Deliballi, B. Kiskan and Y. Yagci, Polym. Chem., 2021, 12, 5781 DOI: 10.1039/D1PY01080H

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