The influence of vinyl activating groups on β‐allyl sulfone‐based chain transfer agents for tough methacrylate networks. Issue 10 (17th December 2015)

• Record Type: Journal Article
• Authors: Gauss, Paul; Ligon‐Auer, Samuel Clark; Griesser, Markus; Gorsche, Christian; Svajdlenkova, Helena; Koch, Thomas; Moszner, Norbert; Liska, Robert
• Is Part Of: Journal of polymer science. Volume 54:Issue 10(2016)
• Page Start: 1417
• Page End: 1427
• Publication Date: 2015-12-17
• Subjects: addition‐fragmentation chain transfer -- mechanical properties -- methacrylates -- networks -- photopolymerization -- shrinkage stress; 547
• DOI: 10.1002/pola.27993
• Languages: English
• ISSNs: 0887-624X

Abstract

ABSTRACT: In radical polymerization of monofunctional monomers, addition fragmentation chain transfer (AFCT) agents are well known to regulate polymerization and yield polymers with lower molecular weights and narrower molecular weight distributions. Papers concerning bulk photopolymerization of monomer mixtures with AFCT agents are rarely found in literature. In this article, AFCT reagents based on β‐allyl sulfones with different vinyl activating groups were synthesized and compared. The compounds were tested in mono‐ and difunctional monomer systems providing information about the influence on photoreactivity, molecular weight, as well as thermal and mechanical properties of the resultant polymers. Where more potent activating groups (‐Ph, ‐CN) markedly influenced polymerization at lower concentrations, the AFCT reagent with an ester activating group reacted at a similar rate to the methacrylate monomer ( C T ≈ 1) and provided the best overall performance. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2016, 54, 1417‐1427 Abstract : Additive manufacturing technologies using methacrylates as photo‐curable resins find increased application in industry and academia. While photo‐curing allows rapid production of well‐defined free‐standing objects, inhomogenous polymer architecture and shrinkage stress during bulk polymerization lead to brittle materials with low impact resistance. In this study β‐ally sulfones with different vinyl activating groups were coreacted with methacrylate monomers to determine the effect on polymerization and to improve the impact resistance of resultant materials.