Cyclopolymerizable Monomers
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Cyclopolymerizable monomers (CPMs) were discovered about 70 years ago by Butler et al., but are rarely described in the field of photopolymerization up to now. We have developed tertiary amine-based CPMs that undergo complete cyclopolymerization, forming linear polymer chains with cyclic structures in the backbone. Compared to similar monofunctional methacrylates, they show significantly improved reactivity and high double-bond conversions. The higher reactivity could be assigned to the formation of a radical on a secondary carbon atom. Furthermore, significantly reduced shrinkage has been observed.
[1] F. Karasu, C. Dworak, S. Kopeinig, E. Hummer, N. Arsu, R. Liska: "Photoinitiating Monomers Based on Diacrylamides"; Macromolecules, 41 (2008), 21; S. 7953 - 7958.
[2] G. Peer, P. Dorfinger, T. Koch, J. Stampfl, C. Gorsche, R. Liska: "Photopolymerization of Cyclopolymerizable Monomers and Their Application in Hot Lithography"; Macromolecules, 51 (2018), 22; S. 9344 - 9353.
[3] G. Peer, M. Kury, C. Gorsche, Y. Catel, P. Frühwirt, G. Gescheidt, N. Moszner, R. Liska: "Revival of Cyclopolymerizable Monomers as Low-Shrinkage Cross-Linkers"; Macromolecules, 53 (2020), 19; S. 8374 - 8381.
[4] L. Ruppitsch, G. Peer, K. Ehrmann, T. Koch, R. Liska: "Photopolymerization of difunctional cyclopolymerizable monomers with low shrinkage behavior"; Journal of Polymer Science Part A: Polymer Chemistry, 59 (2021), 6; S. 519 - 531.