UV-Induced Crosslinking of Poly[2-(2’-Norbornenyl)-2-Oxazoline]s
AbstractA 2-oxazoline monomer bearing a norbornenyl functionality in the side-chain was prepared from the reaction of 5-norbornene-2-carbonitrile and 2-ethanol amine. This monomer could be successfully polymerized using a 2-oxazolinium-based macroinitiator that was in-situ generated from the methyl cation-initiated oligomerization of 2-ethyl-2-oxazoline. This polymer could be subjected to polymeranalogous reactions involving the alkene groups of the norbornenyl side-chains: A proof-of-concept was established by utilizing the polymers in photoresists that were crosslinked by thiol-ene reactions involving bisfunctional thiols. Photoinitiators for the UV-induced thiol-ene reaction were required in catalytic amounts only. After development, the resists exhibited reproduction of the geometric patterns with a resolution of 30 μm.
Keywords: photoresist, thiol-ene reaction, cationic polymerization, polymer photochemistry, poly(2-oxazoline)s, microwave-assisted polymerization
How to Cite
Fimberger, M., Schenk, V., Rossegger, E. and Wiesbrock, F. (2014) “UV-Induced Crosslinking of Poly[2-(2’-Norbornenyl)-2-Oxazoline]s”, Periodica Polytechnica Chemical Engineering, 58(1), pp. 69-74. doi: https://doi.org/10.3311/PPch.7206.