|Name||Mrs. Scarlett Arencibia|
|Organization or Institution||University of Florida|
Functional Thiol-Ene Networks for Impact Energy Mitigation
Scarlett Arencibia, Dr. Daniel Savin
University of Florida
Thiol-ene (TEN) networks display exceptional physicomechanical properties such as low stress, uniform crosslink density, minimal chain end presence and high mechanical energy damping properties. It has been found that these TEN networks exhibit a wide range of glass transition temperatures (Tg) depending on the thiol and –ene monomers used, along with a tunable Tg and increased toughness by incorporating isocyanates into these networks. With incorporation of liquid crystalline (LC) moieties into thiol-ene networks that switch orientation depending on the stress state, auxetic materials can be prepared. Auxetic materials that have a negative Poisson’s ratio upon stretching they thicken perpendicular to the applied force. Upon tension, the liquid crystalline moieties become normal to the stretched network allowing the materials to expand rather than contracting giving them auxetic behavior. In these studies we attempt to incorporate LC azo-benzene and other moieties into TENs. In addition to modifying the TEN networks through LC moieties, we can incorporate polymer grafted nanoparticles (NPs) into the matrix in order to improve the physical properties of these materials. The NPs can contribute rigidity and thermal stability while the organic polymer can contribute flexibility, ductility and processability.