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N ‐Arylsulfonimides as Photoinitiators for Cationic Polymerization of Epoxy Sol‐Gel Materials
Author(s) -
Torti Edoardo,
Protti Stefano,
Fagi Maurizio,
Della Giustina Gioia
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201700626
Subject(s) - cationic polymerization , photopolymer , epoxy , polymerization , polymer chemistry , materials science , trifluoromethanesulfonate , sol gel , ring opening polymerization , copolymer , chemical engineering , polymer , chemistry , composite material , organic chemistry , catalysis , nanotechnology , engineering
N ‐arylsulfonimides, a new class of non‐ionic photoacid generators (PAGs) able to release two equivalents of strong sulfonic acids per equivalent of PAG are employed in solid state polymerization within an epoxy based hybrid sol‐gel system. Thus, epoxy ring opening reactions were successfully induced by UV light exposure of sol‐gel films and the organic network progression was followed by infrared spectroscopy. Polymerization degrees reached with N ‐arylsulfonimides were close to that obtained with a commercial PAG (4‐phenylthiophenyl)diphenylsulfonium triflate, DPST). Different micrometric patterns with satisfactory pattern definition were achieved by UV lithography of sol‐gel films containing a N ‐arylsulfonimide. These new PAGs are therefore promising photoinitiators to be applied in photopolymerization processes and microelectronics.