Accessing pluripotent materials through tempering of dynamic covalent polymer networks
Nicholas R. Boynton, Joseph M. Dennis, Neil D. Dolinski, Charlie A. Lindberg, Anthony P. Kotula, Garrett L. Grocke, Stephanie L. Vivod, Joseph L. Lenhart, Shrayesh N. Patel, Stuart J. Rowan
Abstract
Pluripotency, which is defined as a system not fixed as to its developmental potentialities, is typically associated with biology and stem cells. Inspired by this concept, we report synthetic polymers that act as a single "pluripotent" feedstock and can be differentiated into a range of materials that exhibit different mechanical properties, from hard and brittle to soft and extensible. To achieve this, we have exploited dynamic covalent networks that contain labile, dynamic thia-Michael bonds, whose extent of bonding can be thermally modulated and retained through tempering, akin to the process used in metallurgy. In addition, we show that the shape memory behavior of these materials can be tailored through tempering and that these materials can be patterned to spatially control mechanical properties.