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Oxetane photopolymerization—A system with low volume shrinkage
Author(s) -
Nuyken Oskar,
Böhner Ralf,
Erdmann Christoph
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961070113
Subject(s) - monomer , shrinkage , oxetane , polymerization , photopolymer , sulfonium , materials science , polymer , polymer chemistry , glass transition , solubility , bulk polymerization , epoxy , chemical engineering , chemistry , radical polymerization , composite material , organic chemistry , salt (chemistry) , engineering
Several mono‐, bi‐ and trifunctional oxetanes were synthesized and polymerized in bulk and in solution cationically. Selected photoinitiators have been applied. It was found that sulfonium salts are very efficient due to good solubility, almost no discolouration of the product and storage stability in the monomer in the absence of light. The conversion was determined by quantitative IR‐spectroscopy. Conversion between 75% and 85% was found in all cases. The shrinkage during polymerization was much lower than for vinyl monomers. No inhibition by oxygen was recognized. Monomer layers thicker than 5.5 mm could be polymerized. The products are transparent and almost colourless. The glass transition temperature of the crosslinked polymers was above the temperature of a human body.