title: Exploring Network Formation of Tough and Biocompatible Thiol-yne Based Photopolymers.
abstract: This work deals with the in-depth investigation of thiol-yne based network formation and its effect on thermomechanical properties and impact strength. The results show that the bifunctional alkyne monomer di(but-1-yne-4-yl)carbonate (DBC) provides significantly lower cytotoxicity than the comparable acrylate, 1,4-butanediol diacrylate (BDA). Real-time near infrared photorheology measurements reveal that gel formation is shifted to higher conversions for DBC/thiol resins leading to lower shrinkage stress and higher overall monomer conversion than BDA. Glass transition temperature (Tg), shrinkage stress, as well as network density determined by double quantum solid state NMR, increase proportionally with the thiol functionality. Most importantly, highly cross-linked DBC/dipentaerythritol hexa(3-mercaptopropionate) networks (Tg≈ 61 °C) provide a 5.3 times higher impact strength than BDA, which is explained by the unique network homogeneity of thiol-yne photopolymers.
authors: Chair of Chemistry of Polymeric Materials & Christian Doppler Laboratory for Functional and Polymer Based Ink-Jet Inks, University of Leoben, Otto-Glöckel-Strasse 2, A-8700, Leoben, Austria.
authors: Andreas
authors: A
authors: Oesterreicher
authors: Institute of Applied Synthetic Chemistry & Christian-Doppler-Laboratory for Photopolymers in Digital and Restorative Dentistry, TU Wien, Getreidemarkt 9/163-MC, 1060, Vienna, Austria.
authors: Christian
authors: C
authors: Gorsche
authors: Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700, Leoben, Austria.
authors: Santhosh
authors: S
authors: Ayalur-Karunakaran
authors: Chair of Material Science and Testing of Polymers, University of Leoben, Otto-Glöckel-Strasse 2, A-8700, Leoben, Austria.
authors: Andreas
authors: A
authors: Moser
authors: Chair of Chemistry of Polymeric Materials & Christian Doppler Laboratory for Functional and Polymer Based Ink-Jet Inks, University of Leoben, Otto-Glöckel-Strasse 2, A-8700, Leoben, Austria.
authors: Matthias
authors: M
authors: Edler
authors: Chair of Material Science and Testing of Polymers, University of Leoben, Otto-Glöckel-Strasse 2, A-8700, Leoben, Austria.
authors: Gerald
authors: G
authors: Pinter
authors: Polymer Competence Center Leoben GmbH, Roseggerstrasse 12, 8700, Leoben, Austria.
authors: Sandra
authors: S
authors: Schlögl
authors: Institute of Applied Synthetic Chemistry & Christian-Doppler-Laboratory for Photopolymers in Digital and Restorative Dentistry, TU Wien, Getreidemarkt 9/163-MC, 1060, Vienna, Austria.
authors: Robert
authors: R
authors: Liska
authors: Chair of Chemistry of Polymeric Materials & Christian Doppler Laboratory for Functional and Polymer Based Ink-Jet Inks, University of Leoben, Otto-Glöckel-Strasse 2, A-8700, Leoben, Austria. thomas.griesser@unileoben.ac.at.
authors: Thomas
authors: T
authors: Griesser
mesh_terms: D000480:Alkynes / Q000737:chemistry* / Q000494:pharmacology; D001672:Biocompatible Materials / Q000737:chemistry* / Q000494:pharmacology; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D006801:Humans; D015394:Molecular Structure; D055668:Photochemical Processes; D011108:Polymers / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D013438:Sulfhydryl Compounds / Q000737:chemistry* / Q000494:pharmacology; D013696:Temperature
chemical_list: D000480:Alkynes; D001672:Biocompatible Materials; D011108:Polymers; D013438:Sulfhydryl Compounds
keywords: double quantum solid state NMR; network formation; photopolymers; thiol-yne