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S. Schörpf, Y. Catel, N. Moszner, C. Gorsche, R. Liska:
"Shrinkage stress reduction of polymerizing networksvia combination of vinylcyclopropanes withaddition fragmentation chain transfer";
Vortrag: RadTech Europe 2019, München, Deutschland; 15.10.2019 - 16.10.2019; in: "RadTech Europe 2019", (2019), S. 70.

Polymerization induced shrinkage stress is a restricting factor and one of the most pressing challenges for various applications.1, 2 One way counteract the shrinkage stress is to replace the methacrylates by vinylcyclopropanes (VCPs).3 VCPs undergo radical ring opening polymerization (RROP) during curing which leads to a lower shrinkage stress. Another possibility is to generate a more homogenous network structure by the addition of chain transfer agents (AFCTs).
The combination of VCPs with AFCTs demonstrates a promising technique to prevent the network form a high shrinkage stress. VCPs undergo RROP during the curing process, while the AFCT regulates the network and shifts the gel point to higher conversions. This combination leads to more homogenous networks and a significant reduction of shrinkage stress.

Polymerization, shrinkage stress, vinylcyclopropanes, addition of chain transfer agents