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M. Kury, K. Seidler, P. Dorfinger, T. Koch, J. Stampfl, C. Gorsche, R. Liska:
"Toughening of photopolymer Networks using Addition-fragmentation chain transfer Reagents";
Talk: RadTech Europe Conference & Exhibition 2017, Prag; 10-17-2017 - 10-19-2017; in: "Rad Tech Europe Conference & Exhibition 2017", (2017), 13.

ln coatings technology and other advanced applications, e.g.
3D-printing or microelectronics, usually glassy networks are formed by free radical photopolymerization of multifunctional acrylates. Resulting materials tend to be rather brittle and exhibit an inhomogeneous network structure due to an uncontrolled radical
curing mechanism.
Addition-fragmentation chain transfer (AFCT) reagents can alter this
uncontrolled chain-growth reaction towards a mixed chain growth/
step-growth-like process, which yields materials with more regulated
network architectures and tunable mechanical properties. Especially,
vinyl sulfonate esters represent a promising class of AFCT reagents.
Applied to acrylate-based photopolymer networks, higher conversion
at the gel point leading to lower shrinkage stress, higher overall
conversion, and an increase in toughness can be reached. First
3D-printed parts have already been produced.

free radical photopolymerization of multifunctional acrylates, Addition-fragmentation chain transfer (AFCT) reagents, yields materials with more regulated network architectures and tunable mechanical properties