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D. Grunenberg, C. Gorsche, R. Liska:
"Toughening Photopolymers: The Concept of Hybrid Oligomers";
Poster: Danube Vltava Sava Polymer Meeting 2017, Wien; 05.09.2017 - 08.09.2017; in: "Danube Vltava Sava Polymer Meeting 2017", Book of Abstracts.com, (2017), ISBN: 978-3-9504017-6-9; S. OP-91.

Rapid curing and good mechanical properties are key benefits of methacrylate-based photopolymers that find widespread applications in medicine, coatings and latterly also 3D-printing.
But the high crosslinking density of dimethacrylates leads to several drawbacks, in particular limited toughness and high shrinkage stress. Addition-fragmentation chain transfer (AFCT) agents are capable of overcoming these issues by regulating the free radical chain growth.[1]
In this contribution, we present heterotelechelic hybrid oligomers as a new concept to yield tough and low-shrinkage photopolymers. The hybrid oligomer consists of a reactive methacrylate group and a regulating AFCT group[2] within the same oligomeric backbone (see figure). The photocured polymers exhibit a hyperbranched structure, giving rise to improved mechanical properties and solubility, as well as higher overall conversion and reduced shrinkage stress.

Acknowledgement: We gratefully acknowledge financial support from the Austrian Research Agency (FFG) within the framework of the lead project 'addmanu.at'.

methacrylate-based photopolymers, applications in medicine, rapid curing and good mechanical properties, low-shrinkage photopolymers